The previous chapter may be found here.
Old road to Kiatsukwa Ruins
We do not know exactly when the first humans settled in the Jemez area. Humans, Homo sapiens, are a relatively young species; the genus Homo is thought to have emerged perhaps 2.8 million years ago, close to the start of the Quaternary, and Homo sapiens is perhaps 200,000 years old. The first humans to cross over the Bering Straits into North America arrived somewhere between 40,000 and 16,000 years ago. The oldest human artifacts in New Mexico, discovered at Clovis, are around 13,500 years old, or near the start of the Holocene.
The oldest archaeological sites in the Jemez date back about
11,000 years and consist of obsidian quarry sites and isolated
structures called field houses. These reflect a culture that was
still largely a hunter-gatherer culture that characteristically
hunted big game. At this time, there was a significant population
of megafauna, or large mammals, such as mammoths, musk
oxen, mastodons, camels, and their predators: lions and
saber-tooth tigers. The megafauna abruptly disappeared around
10,900 B.C. for reasons still not agreed among archaeologists,
though overhunting by Paleoindians is widely thought to have
played an important role.
Among the last of the Paleoindians was the Cody culture, which hunted along the major rivers of New Mexico around 7500 B.C. Climate change drove the Cody out of the area within two millennia.
The Archaic people arrived on the Rio Grande around 5500 BC and
were the first agricultural culture of New Mexico. The earliest
flint tool found in the Cerro Pedernal region is characteristic of
the Bajada Phase, 4800 to 3200 B.C. Maize (Indian corn) appeared
around 2100 B.C. and was the major crop by 500 A.D. Beans and
squash may have arrived around 1000 B.C., while cotton became a
crop around 400 A.D. These were farmed using dry land farming
methods that relied on rainfall, which is more abundant at higher
Thus, by 1150 CE, the first permanent communities began to be established in the Jemez, by what are now known as the Ancestral Puebloans. (The older term "Anasazi" is considered derogatory by the modern Pueblo peoples and its use is deprecated.) The remains of their settlements are found throughout the periphery of the Jemez and are particularly well known at Bandelier and Puye Cliffs. No large settlements are found within the Valles caldera itself, which can become very cold in the winter due to its topography forming a natural trap for cold air.
Although some of the Ancestral Puebloans adopted ak-chin farming, which utilizes runoff to water fields, the only culture of this period to adopt true irrigation was the Chacoan, which flourished between 1020 and 1125 A.D. in the region northwest of the Jemez. The Chacoan civilization constructed sophisticated irrigation systems and build large masonry cities, but the civilization abruptly collapsed around 1130 A.D. Possible causes include drought or civil war; infant mortality appears to have been nearly twice as great in the outlying areas as in the central cities, pointing to increasing social stratification. Regardless of the actual cause, the collapse of the Chacoan civilization seems to have left the ancestral Puebloans with a deep distrust of attempts to control nature.
The migration of the survivors of the disaster to higher
elevations also produced conflict, and may account for the
tendency of pueblos in the Jemez to be located atop more easily
defended mesas than in the more fertile valleys.
Map of multiple dwelling Ancestral
Puebloan ruins in the Jemez
The oldest settlements on the Pajarito Plateau date back to about the 13th century and were relatively small and located mostly at altitudes below 6800' (2000m). Each settlement had ten to twelve rooms arranged in two rows, usually laid out north to south. Only two or three rooms had fire pits, and the others may have been for storage. Perhaps two or three families occupied each settlement. The construction was tuff blocks at the bottom of the walls, often giving way to packed adobe towards the top, Scores of such ruins are found on the larger mesas, but archaeologists believe only a few were occupied at any given time.
The population began gathering into larger settlements the 15th
century, and by the end of that century there were a number of
much larger population centers. One of these is Kiatsukwa Pueblo
ruins, located near 35
44.000N 106 36.971W. This is easily accessible from Forest
Road 10, but if you choose to visit, be extremely respectful of
the area, disturb nothing, and take no samples (even of natural
rocks.) The ruins are strictly protected under the Antiquities
Note the many large branches laid deliberately along the road to
the ruins. This was likely done to control erosion along the road
and allow vegetation to grow over the road, but the branches also
discourage casual visitors to the ruins.
Old road to Kiatsukwa Ruins
Large boulders have also been placed at the junction with Forest
Road 10 to block vehicular movement. I repeat: If you visit, take
only photographs, and do not disturb the ruins in any way.
The ruins are largely unexcavated and consist of mounds of roughly shaped blocks of Bandelier Tuff. The site was occupied between 1400 and 1500 A.D. and briefly reoccupied in the early 1600s.
The pueblo numbered about 400 persons at its peak, with some buildings having three levels. The valley here is underlain by El Cajete Pumice, which seems to have been favored by the Ancestral Puebloans for its fertility and capacity to hold water. The pumice is evident in the soil along the road.
Another important ruin is Otowi, located in Pueblo Canyon east of Los Alamos. This ruin is easily viewed from the Clinton P. Anderson Overlook, being located directly to the north on a ridge on the canyon floor.
Otowi Ruins. Looking north from 35 52.386N 106 14.006W
This ruin is completely unexcavated and likely to remain so,
since it is on tribal lands of the descendants of the people who
lived here. However, the ground has a characteristic appearance in
the satellite photograph that is partially discernible at ground
The area was probably wetter in the 15th century. There is abundant archeological evidence that the Ancestral Puebloans abandoned many settlements in what are now quite dry areas of the Southwest at about this time and moved to the valleys of the Rio Grande and its major tributaries, where their descendants live today.
The establishment of relatively large settlements did not end the use of field houses. Over one hundred field houses have been found in the Frijoles quadrangle alone, which takes in most of Banderlier National Monument and the LANL test ranges to the north.
Tsankawi is the site of another large unexcavated ruin.
Eastern edge of Tsankawi ruins. 35
51.705W 106 12.895W
There are a number of archaeological sites around the world that have been left deliberately unexcavated like this. In some cases, it is out of respect for the feelings of identifiable descendants of the peoples of the ruins who are leery of having their ancestors’ ancient homes poked around. But in other cases, it is because the ruins are typical of a culture that has already been much studied, and are being left unexcavated against the day when better methods of excavation are invented. In the case of Tsanwaki, I suspect both reasons apply.
I also noticed that the visible edge of the ruins on the ground are well within the area that looks visibly disturbed on satellite. I have no ready explanation.
Within the ancient walls are at least two pits that are likely unexcavated kivas.
Kivas at Tsankawi. 35
51.727W 106 12.930W
Kivas were the underground ceremonial spaces of the Ancestral Pueblo People. The classical kiva is a round room, roofed over, with a small pit on the north side (a sipapu) represented the doorway from which the first humans emerged from the underworld. Kivas are interpreted by some archeologists as models of the Universe, where heaven, earth and the underworld meet — as with temples in many ancient cultures.
In addition to walled villages and individual field houses, the Ancestral Pueblo People excavated caveate rooms in cliffs of the relatively soft tuff of the Bandelier Formation.
Here is a caveate room with a kind of atrium excavated along the trail to the top of Tsankawi Mesa.
Caveate room with atrium at Tsankawi. 35
51.673N 106 13.134W
The shape of the atrium appears to have been largely determined by natural jointing in the rock, but the faces were probably smoothed off and the row of holes then excavated to seat timbers supporting a light roof. The opening to the left is into a caveate room, which likely started as a natural cavity in the rock that was further excavated by the Ancestral Puebloans. These people came to the area in the 15th century and were speakers of the Tewa language, rather than the Keres language of the settlements in the main section of Bandelier National Monument to the southwest.
Other traces of early humans in the Jemez include trails or steps cut into the relatively soft tuff of the Bandelier Formation. There are a pair of likely prehistoric steps in the tuff above the Clinton P. Anderson Overlook.
Prehistoric steps. Near 35.872N 106.234W
This area saw some modern traffic in the 1940s, when the old road
to Los Alamos made switchbacks up the nearby mesa face. However,
the new road is further away, and it it unlikely these are modern
There are prehistoric trails carved deeply into the Bandelier
Tuff in several locations.
Prehistoric trail on Potrillo Mesa. Near 35.795N 106.221W
This is located on Potrillo Mesa south of White Rock and is now used by the occasional modern hiker. Similar trails are prominent in the Tsankawi section of Bandelier National Monument.
Prehistoric trail at Tsankawi. 35
51.732N 106 13.044W
The desert varnish visible in the trail shows its antiquity. The fact that the desert varnish has not been worn away shows that most modern tourists walk on the higher ground around the trail rather that in the trail. This seems most natural.
So why, then, did the Native Pueblo Peoples even create this trail?
Among the traces left by the Ancestral Pueblo People are petroglyphs. These are markings etched into stone, found scattered throughout the southwestern United States. A large number of petroglyphs are found on the eastern escarpment of the Cerros del Rio near the village of La Cieneguilla.
La Cieneguilla petroglyphs. 35.605N
The petroglyphs in this area are on hawaiite that has a thick weathering film, known as desert varnish. When the surface is pounded with a heavy tool, the desert varnish is removed and the lighter rock beneath exposed. Such petroglyphs can be roughly dated from the extent to which fresh desert varnish has begun to form over the petroglyphs, and this establishes that the petroglyphs were etched by Ancestral Pueblo People.
I know little about petroglyph iconography. But then, so do
archaeologists, who have a number of conflicting notions about
their significance. For example, the spiral pattern seen in the
last photograph is often interpreted as a representation of the
sun, but it has also been interpreted as a representation of water
or of migration.
I have seen petroglyphs throughout the Jemez area, including petroglyphs carved on Bandelier Tuff and in Mesozoic sedimentary rock. Basalt seems favored but not decisively so. Some petroglyphs are found close to ancient settlements, but I’ve also seen petroglyphs in areas far from any known settlement, including White Rock Canyon (map) and the Hagan basin (map)
Here’s one where I can at least put a name to some of the iconography.
The figure at center with the head appendages (probably
representing feathers) is Kokopelli, a fertility deity shared
across several native American cultures. Kokopelli may have
originally represented a kind of wandering priest whose flute was
a symbol that he came in peace. Kokopelli has been thoroughly
commercialized in the modern American Southwest, which I find
Petroglyphs are found at several locations along the west rim of White Rock Canyon. Some are likely authentic ancient Native American rock art:
and some are not.
The petroglyph in the first photograph not only shows an authentic ancient pattern, but it also shows a thin layer of desert varnish reflecting its antiquity. This is not present on the newer, inauthentic petroglyph.
The nearest known ancient ruins to these petroglyphs are at Tshirege and Navawi. Neither ruin has been excavated or is accessible to casual visitors.
Petroglyphs of a subtly different character are found northwest of Abiquiu.
Petroglyphs at Red Wash Canyon northwest
of Abiquiu. 36
14.518N 106 22.877W
The Jemez was an important center for the ancient obsidian trade,
with the obsidian being used to fashion spear heads and other
tools. Obsidian from the Jemez was traded throughout the
Southwest, and may have been transported as far as Ohio or
Mesoamerica. Important ancient obsidian quarries have been
identified at Cerro del Medio, El Rechuelos, the Rabbit Mountain
debris flows, Bear Springs, and possibly Paliza Canyon.
While hiking around Cerro la Jara close to the Valles Preserve
vistors' center, I came across what is likely an ancient tool
This is a location on the north side of the dome, showing a scattering of obsidian chips on the ground. As we've seen, obsidian and rhyolite form from the same kind of of lava and are often interbedded, but these are isolated chips; the bedrock here is all rhyolite, not obsidian; and these chips are freshly broken, not rounded clasts one would expect if they had eroded out of the local rock. That makes it a fair guess that is this is a toolmaking site. It is common for prehistoric quarries and tool manufacturing sites to be at separate locations. I was careful not to disturb it, beyond placing a quarter on the spot to provide scale for my photograph and then removing it.
The first Spanish arrived in the New Mexico area around 1540, but
for decades the area remained largely unknown to Europeans. In
1598, King Phillip II of Spain authorized Juan de Oñate to
organize a new Spanish province in what is now New Mexico. Oñate
crossed the Rio Grande at El Paso and established his headquarters
near the confluence of the Rio Chama and Rio Grande south of Black
Mesa, at the pueblo of Ohkay Oweenge. Oñate named his new capital
San Juan de los Caballeros. At this time, there were about 81
major pueblos and a population of about 100,000 Puebloan people.
Sixty years later, there were 31 pueblos with a population of
15,000. The catastrophic decline in population has been attributed
to epidemic diseases unwittingly introduced by the Spanish,
mistreatment of the Puebloans, raids by migratory tribes who had
acquired horses, and drought.
The Spanish reintroduced irrigation, forgotten since the time of
the Chacoans, and the acequia or community irrigation
canal became the hallmark of Spanish settlements along the Rio
Grande and its tributaries. The carrying capacity of the land was
not large, even with irrigation, and the Hispanics of northern New
Mexico developed a culture of small communities at favorable
locations that shared water rights and grazing lands for their
cattle. One such community is Canones.
The northern tip of Polvadera Mesa gives a magnificent view of the Canones Creek valley.
Canones area from northern Polvadera
09.723N 106 25.816W
At left in the middle distance is Pueblo Mesa. Beyond is the sloping ground north of Cerro Pedernal, with the cliffs of Mesa Alta on the skyline. The village of Cañones lies in the valley left of center, with a glimmer of Abiquiu Reservoir in the distance. Behind and to the right of Cañones is Cañones Mesa, which merges with the El Alto Plateau at right. The canyon at the bottom right of the panorama is Polvadera Canyon.
Pueblo Mesa has the old Ancestral Pueblo People ruins of Tsi’pinouinge atop it. This appears on the panorama as a tan patch of clear ground on the right side of the first frame. I’m afraid my camera can’t do it justice. Through my binoculars, I could make out piles of stone blocks covering this area, and a low cliff running through the area that appeared to have doors and post holes excavated in it. There is also some ruined walls further south (left), where a trail comes up to the mesa top. I could not make out the shapes of buildings and kivas from this angle that are visible on satellite.
The satellite photo appears to show a
single kiva far from the village. I’m not sure what to make
of this, unless this was an unusually favorable site for
excavation using simple tools.
The name, Tsi’pinouinge, means "village of the flaking stone",
referring to the many quarries in the Pedernal Chert nearby. Cerro
Pedernal is itself known as Tsi'pin ("flaking stone") or possibly
Tzi'iping ("pointed mountain'). This pueblo was the largest and
northernmost of all the pueblos of the Classical Period, occupied
from 1200 to 1325 AD. It had up to 400 rooms, 16 kivas, and a
central plaza. After it was abandoned, the area was occupied only
by nomadic Utes until the arrival of the Spanish.
Cañones is a Hispanic
village of about 113 persons. Its origins trace back to
1766, when Juan Pablo Martín Serrano was awarded the Polvadera
Grant. Serrano was a a wealthy military veteran with a large
family, and established a seasonal rancho in the canyon,
raising livestock, farming the canyon bottom, and trading with the
Utes. Permanent settlement seems to have begun with Juan Bautista
Valdez, who bought a grant at the present location of Cañones in
Cañones is typical of the small Hispanic villages of northern New Mexico, which are sustained by cattle and sheep ranching and farming. Anthropologists Paul Kutsche and John R. Van Ness have contrasted the Hispanic culture south of the Jemez, which they name the Rio Abajo, from the Hispanic culture north of the Jermez, which they name the Rio Arriba. The Rio Abajo tradition is characterized by large individual land grants, social stratification (patrón and peón) and large-scale sheep herding, while the Rio Arriba tradition, of which Cañones is an example, is characterized by communal land grants, small economies, campanilismo (community spirit), and a fair degree of social equality. An important institution of communities like Cañones is the acequias, or irrigation ditch, which provides abundant irrigation to the canyon bottom: Cañones and Polvadera Creeks provides an ample 33 acre-feet per year of water.
The Spanish community grant or merced came with an
obligation to improve and defend the land, or it reverted to the
government. Land was divided between house plots, irrigable plots
of a few acres measured by frontage on along the stream, and
common land for grazing and gathering food and firewood. The
former two categories could be privately owned and sold, but the
common land was shared by the community, whose members held a usufruct,
or use right, to the common land. This system worked reasonably
well for a community engaged in subsistence farming.
The surrounding land can support about one cow per 126 acres at
lower elevations, one cow to twelve acres in the best locations at
middle elevations, and one cow to 48 acres at higher elevations.
Sheet irrigation is used to increase the carrying capacity of
pasturage in the immediate area of the village. The frost-free
period runs only from around May 24 to September 26, making fruit
cultivation and gardening a hit or miss proposition.
The town gained temporary fame in 1966, when the state closed the
one-room school and ordered the children to attend school in
Coyote, which at the time meant busing the students several miles
over a very bad road. The parents refused en masse to send
their children to school in Coyote, and the subsequent legal
battle seems to have revolved around the issue of whether the
parents were acting on legitimate concerns for their children's
safety or were using the children to pressure the state into
building a better road into the community. The upshot is that the
parents were fined for truancy, but the village now has an
acceptable paved road.
The residents of Cañones value their privacy; geologists familiar with the area and culture recommend that, if you wish to visit Tsi’pinouinge (which requires a permit from the Coyote ranger station), you should approach the area via a trail from near the point where I took this photograph rather than through Cañones. Please note that I have not hiked this trail and cannot guarantee that I have correctly identified the trailhead.
The Mexican War of 1847 transferred sovereignty over New Mexico to the United States. However, the Treaty of Guadalupe Hidalgo gave U.S. citizenship to those New Mexicans who chose not to emigrate to Mexico and bound the United States to recognize the land grants made by the Spanish viceroy or his governors that had continued through the Mexican era. Existing water law was initially left intact, and the institution of the acequia has been little disturbed since 1847 and remains in place in many of the villages of northern New Mexico to the present day.
The recognition of existing land grants in 1847 still leaves its mark on modern maps, which often show grant boundaries. Grant boundaries are often marked by road signs. The Valles Preserve is marked as Baca Location 2 on some older maps, hearkening back to the time when the Baca family owned the land as a former land grant. Some grants remain largely intact even to the present day. This is particularly true of land grants controlled by pueblos, but the Merced del Pueblo de Abiquiu grant, originally awarded to a community of genízaros (Hispanicized Native Americans) around 1750, also remains intact. The grant takes in most of northern El Alto Mesa, and tourists driving in this area will find themselves restricted to roadways. But they will also find the area lovingly maintained, particularly in comparison with the nearby National Forest lands.
The arrival of the railroad in New Mexico in 1878 accelerated contact between Anglos and Hispanics and native Americans, and also led to increased friction. Different legal traditions were a particular source of difficulty. Some disputes over land grant boundaries continue to the present day. But some of the thorniest disputes came over the issue of partition. With the arrival of the railroad, livestock raised in New Mexico could be shipped to distant and eager markets, and the grazing land held communally by small Hispanic villages suddenly jumped in value. Under the old customs, ownership of this land was nonpartible; that is, one could sell the right to share in the use of this land to a new owner, but the land itself could not be divided up and portions sold. American law had always viewed land as partible, and conflicts arose when Anglo purchasers thought they were purchasing exclusive use of a tract of ground and Hispanic sellers thought they were selling the right to share in the use of the land. American courts tended to side with the American purchasers, which produced lasting bitterness in the Hispanic community.
However, much of the Hispanic community was able to adjust to American legal and political traditions, and today Hispanics hold a substantial fraction of state and local political offices. Native Americans have not fared as well, in part because they now make up less than 10% of the population, and in part because of the greater cultural gap between native Americans and Anglos compared with the cultural gap between Hispanics and Anglos.
Cattle ranching plays a significant role in the history of the Jemez area, and cattle grazing on National Forest lands remain a part of the Jemez experience. The Valles preserve is still a working cattle ranch, and historical buildings from the ranch days continue in use by Preserve staff.
Old ranch headquarters. 35 51.877N 106 31.022W
The building in the second photograph has an octagonal floor plan and was apparently used as a guest lodge.
Cattle grazing on most National Forest lands is by permit based on carrying capacity. The hiker will encounter cattle in most of the more fertile parts of the National Forest areas of the Jemez.
A mooving sight.
In my experience, most such small herds are mixed steers and cows
(with calves at the right time of year.) It is well to remember
that even cows can be aggressive if provoked badly enough, and
that these animals represent considerable wealth to their owners.
Treat them with due respect.
During the early part of the 20th century, much of the Jemez was opened to logging, which continues (on a much reduced scale) to the present day. Logging was particularly extensive in the Valles caldera in the 1960s, including in the area around Redondito.
Logging roads east of Redondito. Looking
southeast from 35
54.294N 106 33.224W
The angle of the sun highlights the rows of logging roads on the peak. Most of the old roads in the caldera are now overgrown, but they make an effective network of trails for hikers and mountain bicyclists. However, the roads shown in this photograph are off-limits, as they are in the cultural exclusion zone around Redondito and Redondo Peak, established out of respect for native American beliefs.
Logging brought with it an emphasis on fighting forest fires. It took decades to recognize that this could be counterproductive, by allowing undergrowth and forest litter to build up to the point where fire potential became explosive. Fires in such forests tend to be hot fires that reach the crowns of the trees, with devastating effect. We now have a better understanding of how fire can renew wild lands, burning out excess undergrowth and thinning tree seedlings.
Here’s what a healthy ponderosa forest is supposed to look like.
The trees are widely spaced and surrounded by grassland. This is what you get if there are frequent “cool” ground fires to cut down the number of ponderosa saplings and promote the growth of grass.
With improved understanding of the role of fire, the Forest
Service regularly carries out prescribed burns of selected areas
of national forest. One such burn went out of control in May 2000,
becoming the devastating Cerro Grande fire which destroyed 48,000
acres (190 km) of forest and over 400 homes in Los Alamos. The
decision to carry out the prescribed burn was controversial, since
spring is the windy season in the Jemez and the area was bone-dry.
However, the Forest Service was concerned that the Cerro Grande
area was a tinderbox that could catch fire from lightning strikes
at any time as an uncontrolled burn, and took the gamble of
risking a preemptive controlled burn -- a gamble that was lost.
Mining has played an important role in the history of the Jemez. We have already learned about gold mining in connection with the Bland Monzonite. But mining of copper took place even earlier, and mining of pumice continues to the present day.
The mining industry distinguished between mines, quarries, and
borrow pits. A borrow pit is an open pit where gravel and other
unconsolidated material is removed for use in construction, while
a quarry is an open pit where solid rock (rather than any ore it
contains) is mined for use as dimension stone. Any excavation for
extracting specific ores or other minerals is a mine.
Copper mining likely dates back to the time of the Spanish conquistadores,
and copper ores were worked in the Shinarump Formation near Cuba
and in Canyon
del Cobre ("Copper Canyon") or in the Abo and Yeso
Formations in Canon
de San Diego. Of these, only the Nacimiento mine has been
worked in modern times.
The mine has been worked since at least the 19th century, originally by adits (horizontal tunnels) in the copper-bearing beds. These were shut down during the First World War, due to the wartime labor shortage, and never reopened. Open-pit mining began in the 1960s and continued to 1975, when rich new copper deposits in South America began to be mined and drove the worldwide price of copper so low that the Nacimiento mine could not longer be profitably worked.
In 1984, an attempt was made to extract the ore by in-situ leaching using a solution of sulfuric acid. However, the method proved uneconomical. By then some 25,000 gallons of sulfuric acid had been pumped underground. This posed a serious environmental hazard, and in 2007 the Forest Service began remediation, flushing fresh water through the ore body to remove the acid waste and processing it in a series of treatment ponds on the site. The water returned to the watershed is apparently so cleaned up that it meets drinking water standards.
The treatment ponds begin with an anaerobic pond, filled with boulders, in which alcohol is added to feed anaerobic bacteria. The bacteria convert the sulfuric acid in the leach water to hydrogen sulfide, which precipitates out most of the metal contaminants but gives a distinct stench to the area.
Most copper mines consist of copper sulfides deposited by
hydrothermal activity, with a rich cap of copper carbonate
minerals (green malachite and blue azurite) formed by oxidation of
the upper part of the ore body. The copper mines of the Jemez area
are unusual in that the copper minerals were deposited by
replacement of organic matter. The copper was leached from
overlying formations by groundwater, which then percolated through
the underlying sandstone. The copper replaced the organic matter
in the sandstone as chalcocite, Cu2S, along with minor
amounts of copper carbonates.
Copper mineralization at Nacimiento
59.583N 106 53.815W
This is a large fragment of petrified wood surrounded by
malachite exposed on the east face of the Nacimiento Mine. The
main ore body must have been spectacular. The green color is from
malachite, while the petrified wood contains a variable amount of
black chalcocite. Unfortunately, this can be hard to distinguish
from the carbon of the original wood.
Here is a bit of petrified wood showing copper mineralization
from the tailings dump.
It’s not a large fragment, but in addition to having beautifully
preserved grain, you can see that there is some kind of membrane
or layer cutting across the grain at intervals of a few
millimeters. I am not paleobotanist enough to tell you the
significance of this, alas. The fragment is also heavy, suggesting
that there is considerable replacement of carbon by chalcophile.
Even the main ore body at the Nacimiento Mine was mostly quartz
sandstone. Rock from the ore body was milled fine, then the gangue
(waste rock) was separated from the ore to produce copper
concentrate suitable to be shipped out for refining. This was done
by flotation, in which the finely ground mixture of ore and gangue
is placed in a tank of water through which air is bubbled.
Chalcocite grains readily cling to the bubbles and are floated to
the top of the tank, where they are skimmed off and dried as
copper ore concentrate. Because much of the ore at the Nacimiento
Mine occurs as copper carbonates, special surfactants were
developed that, when added to the water in the tank, caused
carbonate mineral grains to cling to the bubbles as well, allowing
both ore minerals to be separated from the gangue in one
The largest city in the Jemez came into existence quite abruptly in 1943, on the site of a former boys' school on the Pajarito Plateau. Fuller Lodge was part of the school complex and is now the oldest building in Los Alamos still in use.
Fuller Lodge. 35 52.921N 106 18.161W
The school was closed during the Second World War to make way for
a secret laboratory for developing the atomic bomb. After the use
of atomic bombs on Hiroshima and Nagasaki contributed to ending
the war, the laboratory continued research in nuclear energy,
eventually becoming a permanent establishment and the major
employer of town of Los Alamos. It remains so today.
Because there is obviously hot rock not far below the surface
here, exploratory geothermal drilling was done in the Jemez during
the 1980s. The Baca #1 well was drilled near the road north of
Baca #1 well pad. 35.909N
The geothermal potential turned out not to be great enough for profitable exploitation, but the drilling contributed significantly to our understanding of the geology of the Valles caldera.
Digital relief map of the Jemez area. ©2015 Kent G. Budge
The Jemez Mountains are still largely undeveloped, and likely to remain so for the foreseeable future. However, there is a major paved highway (NM 4) through the heart of the Jemez and a loop of paved highways around the periphery of the Jemez. The mountains also have a good network of forest roads. While these are gravel roads, the most important are well-maintained and suitable for passenger vehicles in good weather.
The entire Jemez area has been extensively mapped by geologists, and most of the geologic maps are available online from the New Mexico Bureau of Mining and Mineral Resources. Geologic maps are generally based on a topographic map of the mapped area, but show locations of rock formations, faults, and other geological features. These maps can be invaluable for the serious geology enthusiast visiting an area.
Perhaps the most useful resource for the geology tourist is the
extensive sets of road logs for the Jemez area. A road log
is a prescribed route with odometer mileages describing geological
features along the route. These are best (and most safely!) used
by a driver and co-driver. The vehicle's trip odometer is reset at
the start of the route, and the driver follows the prescribed
route while the co-driver watches the trip odometer and follows
the road log to identify interesting geologic features. Extensive
road logs have been published for the Jemez area by the New Mexico
Geological Society, and some are available online.
Valles Preserve visitors' center. Looking southwest from 35 51.412N 106 29.459W
The heart of the Jemez, the Valles Caldera, is almost entirely contained within the Valles Caldera National Preserve. A day pass costs you $15, and to drive in the back areas of the caldera, you will also need a back country vehicle permit. This is free with the $15 day pass but only a limited number are issued each day. The gravel roads to the north moat and along the length of the moat are kept in good condition and are suitable for passenger vehicles in good weather.
The trip to the north moat will give you a good view of the
topography of the caldera, caldera rim, ring domes, and resurgent
dome (Redondo Peak and Redondo Border.)
The southeast portion of the Jemez is contained within Bandelier National
Monument. Access is exclusively by shuttle bus from the transfer
station at White Rock, except during the winter months or if
you have a handicapped parking permit. The transfer station has
extensive parking and a modest number of inexpensive overnight
trailer stations, and it ties into the main bus system of Los
Alamos County, which does not charge fares. A 7-day individual
pass to Bandelier is $6.
The main attractions at Bandelier are the extensive archaeological sites, but there is also some splendid geology, especially in the back country. For a short stay, I recommend the hike to Upper Falls. If you have more time, the hike from Ponderosa Campground the length of Frijoles Canyon to Upper Falls is a nice tour of many of the formations of the Pajarito Plateau.
The tent rocks of Kashe-Katuwe National Monument and the Veterans Memorial Overlook into the Bearhead Peak area are not to be missed. Hours are somewhat variable; I recommend arriving early in the day. Admittance is $5 per vehicle. Be aware that there is no lodging nearer than Santa Fe.
The road to the tent rocks is a paved all-weather road, but the
road from there to the overlook is a gravel road which, while
suitable for passenger vehicles in good weather, is closed during
inclement weather or conditions of limited visibility.
No rock collecting is permitted within the boundaries of the
Preserve or the National Monuments. Pets, other than service
animals, may also be restricted to certain areas.
If you are planning to visit a number of the national parks,
preserves, and monuments in the western United States during your
trip, you may find it worthwhile to get an interagency annual
pass. This is $85 per individual but gets you practically
unlimited access to parks, preserves, and monuments for a full
year. Note that you will still need a back country permit in the
Valles preserve (though there will be no fee.)
Much of the Jemez surrounding the Valles preserve is under the
jurisdiction of the Santa Fe National Forest. This is freely
accessible in summer, though many roads are closed during the
winter and early spring. Unless there are local regulations to the
contrary (as in the immediate area of Soda Dam) you may collect
reasonable quantities of hand specimens for personal study.
Most roads are gravel roads and these vary greatly in quality. The best are suitable for all passenger vehicles in good weather; the worst are barely suitable for an off-road vehicle with high ground clearance and a roll bar. Take care on sharp turns on steep grades; even the roll bar won't save you if you go off a vertical cliff 50 meters high, of which there are many in the area.
Note that many of the forest roads are closed to most traffic
from January 1 through April 15.
This is the main road into the southeast Jemez and San Miguel
Mountains. It branches off State
Road Four, throws out a spur
to St. Peter's Dome, and continues to the Cochiti
area. The section from State Road Four to the Dome spur is a
first-rate gravel road suitable for passenger vehicles in good
weather. From there the road gets rougher, but is still acceptable
for passenger vehicles driven with care, until you reach the
former Dixon apple orchard. The road here has been washed
out by repeated flash floods, and, while I've crossed this stretch
once in my Hyundai Elantra, I was taking a big chance.
The spur to St. Peter's Dome is quite rocky but acceptable for passenger vehicles until about halfway up the ascent to the Dome parking area. Again, I've crossed this area in my Hyundai Elantra, but I would not recommend this to most drivers.
This road also branches off State Road Four, with a branch that connects to Forest Road 289 and another branch that enters lightly built up area near a volunteer fire station. There are several branches from here, all leading to private property. However, the road is another well-maintained gravel road suitable for passenger vehicles in good weather, and the area is scenic.
This is the main road through the southern Jemez, branching off State Road Four and passing though the village of Ponderosa before rejoining State Road Four. The southern portion (SR 290) is a paved all-weather road, while the northern portion (FR 10) is well maintained and quite suitable for passenger vehicles in good weather. This is a particularly scenic drive through a heavily forested area that has not experienced recent fires.
This road branches
off Forest Road 10 onto Borrego Mesa and takes you to the Bear
Springs area. It is not as good a road as Forest Road 10,
but is negotiable in a passenger vehicle with reasonable ground
clearance (such as an XUV) in good weather. The chief hazard is
taking a branch of the road by mistake and ending up in a rock
garden. Familiarizing yourself with the route and employing a GPS
to navigate is recommended.
This is the main road in the southwest Jemez, paved from its junction with State Road Four to the Guadalupe Box and an excellent gravel road from there to its junction with State Road 126. The road is suitable for almost any vehicle in good weather, including campers, and goes through some of the most scenic country in the Jemez. If you have time for only one back country drive during your visit, this is the one I'd recommend.
Note that Forest Road 376 continues north of State Road 126. This
portion of the road is rocky in places and badly washed out in
others, but I have driven it in my Hyundai Santa Fe.
This is the main road of the western Jemez. Though marked on maps
as a highway, this road is only partially paved, being
well-maintained gravel over its middle third.
This is the main road in the northern Jemez. It branches off
State Road 96 at Youngsville
and continues high into the Jemez, where it eventually joins
up with Thirtyone Mile Road (Forest Road 144) via Forest
Road 99. There is a spur
Point and its magnificent overlooks. The road is another
well-maintained gravel road, passable to campers at least to the
La Grulla Plateau. The Encino Point turnoff could be awkward for
large vehicles, and the road is gated a significant distance from
the old fire tower. The best lookout point is directly west of the
gate at the end of the long meadow.
This road departs from Espanola and runs into the northwest Jemez
to join Forest Road 100. The road is well-maintained gravel at
least as far as the foot of Gallina
Mesa. From there the road becomes quite rocky as it climbs
towards the rim of the Valles Caldera, but it is passable for
passenger vehicles in good weather with careful driving. There are
logging roads up onto the rim itself -- a magnificent view -- but
these are in quite poor shape and are best driven (if at all; the
hike is not far) in a four-wheel drive vehicle with good ground
There are no unusual hazards in the Jemez area. Nevertheless, you
can certainly get yourself killed here if you work at it hard
The Jemez experiences a summer monsoon from early July to late September that can cause torrential if brief rain from local thunderstorms, mostly in the afternoon. Lightning danger is very high. If you hear thunder, get off high ground as quickly as you safely can. If you are caught in the open, stay away from isolated trees or other natural lightning rods, and crouch low on your feet. Rubber soles provide modest protection by acting as an insulator. Don't head for stream beds, as there is danger from ...
The Jemez are crossed by numerous deep and narrow canyons and arroyos (dry stream beds). A sudden cloudburst can fill these with roaring water with amazing speed. Do not hike in arroyo bottoms if there is another route; do not hike in arroyo bottoms if there is any sign of rain; and if you do insist on hiking in an arroyo bottom, be ever mindful of the fastest route to higher ground in case the need arises.
The Jemez covers three climate zones, from the high desert of the
Upper Sonoran Zone below 2100 meters (7000') through the
Transitional Zone between 2100 meters and 2700 meters (9000') to
the Canadian above 2700 meters. The Upper Sonoran is characterized
by piñon and juniper scrub forest and arid grassland; the
Transition Zone by ponderosa forest; and the Canadian Zone by
mixed forest of spruce, fir, and aspen.
Taking adequate water when hiking is a must. You require a full gallon of water a day when hiking in the lower terrain in mid-summer. The altitude also makes for wicked sunburns; you are well advised to slather on sunscreen rated SPF-30 or better regardless of how well tanned you already are. Insect life is locally abundant, so bring the DEET as well.
You are well advised to bring warm clothing even in summer if you
are planning to hike in the higher elevations. If you are soaked
by a sudden thunderstorm while on the trail, there is risk of
Cell phone coverage is very limited away from the main settlements and paved roads. In an emergency, you may have a better chance of getting a connection if you are on higher ground, though there is no guarantee. You can pretty much count on no wireless service in the wild canyons of the north, west, and south Jemez.
Beware this critter.
Crotalus atrox near the Veteran's Memorial Scenic Overlook. 35 40.138N 106 26.984W
This is the Western diamond rattlesnake, which, along with the
prairie rattlesnake (Crotalus viridis), is the chief
poisonous serpent of the Jemez area. They are numerous and their
bite is very dangerous. I encountered the one in the photograph at
the overlook at Kashe-Katuwe Tent Rocks National Monument. I've
also encountered a rattlesnake next to the main loop trail at
Bandelier National Monument.
Fortunately, rattlesnakes are not aggressive. They rattle because they would rather not tangle with you, and they are not looking for reasons to bite. Back away and you will be fine.
Provoke an attack, and you had better hope someone in your group has the presence of mind to bundle you in a car and get you to a hospital as quickly as possible. Don't bother mucking around with trying to suck the venom from the wound or applying a constriction band; both are dangerous wastes of time when the right course of action is to keep the victim quiet, keep the bitten limb as low as possible, and get the victim to a hospital as quickly as possible. If you can get a wireless connection, dial 911 for rescue.
The bull snake is a smaller animal that superficially resembles the Western diamond rattlesnake.
The bull snake is harmless, but it never hurts to be on your best
manners when encountering wild animals.
The only other poisonous critters of any significance in the
Jemez are insects, spiders, and scorpions. None have dangerous
bites or stings, but they can be very painful.
Coyote or timber wolf print in Valle
The chief large predators are coyotes, bears, and cougars.
Coyotes (smaller relatives of wolves) are not particularly
dangerous unless infected with rabies. If a coyote acts oddly (and
unprovoked aggression by a coyote is definitely odd) avoid the
animal. If you get bit, you're in for a series of painful rabies
vaccinations, with the added delight of a slight risk of the
vaccinations failing, which means a most unpleasant death.
Bears are usually shy, rarely have rabies, and will normally
attack only if cornered or if you come between them and their
cubs. Do not offer food to bears under any circumstances. Do not
leave food around your camp where it is accessible to bears. I
once had the bad fortune to encounter a bear in the foothills of
the Sierra de los Valles just as a four-wheel vehicle was
approaching from the other direction; had the bear felt trapped
between us, the situation could have got very ugly. Fortunately
the bear had nearby brush to escape into. In the summer of 2015,
another hiker was less lucky; he found himself between a bear and
her cub and was badly mauled. A cross-country runner was mauled in
the summer of 2016 when she inadvertently got between a mother
bear and her cubs.
While bears account for a greater number of recent maulings than any other (nondomestic) species in the Jemez, cougars (mountain lions) are individually the more dangerous predator. Fortunately, they are uncommon and wary of adult humans. I encountered one at a very uncomfortably close range in the outskirts of White Rock once at twilight; I kept my flashlight facing the cougar's glowing eyes while I backed away about a hundred yards, then turned and ran like hell. It seemed to work. I am careful to keep a light on when walking in twilight now, so that any large predator will have warning that I am coming, and will likely quietly slip away.
Elk are the largest herbivore commonly found in the Jemez. They
are normally shy, but if you provoke a stag elk like the one in
this photograph, he's going to get mean. While there have
been no recent gorings by elk in the Jemez, it is wise to give
these animals some space. You can often hear nearby elk bugling,
particularly during the autumn mating season.
Recording of elk
I suppose this one has to be included, if only to reassure the
nervous reader. There has not been any volcanic activity in the
Jemez for perhaps 50,000 years; and, while it is quite likely
there will be further eruptions someday, the odds are heavily
against one in our lifetime.
There would be warning signs of such an eruption. One of most reliable indications of rising magma is an increase of sulfur emissions from hot springs and fumaroles, which can begin years before the actual eruption. Later, as magma begins moving towards the surface, it fractures the rock along its path and produces a characteristic kind of earthquake called harmonic tremor. Since the Jemez is monitored by the Los Alamos Seismic Network, established in 1973, harmonic tremor would likely be detected almost at once. Finally, almost every violent volcanic eruption on record has been preceded by at least a few hours of ash eruptions that typically pose little immediate danger. Were such warning signs to appear, the sparsely-populated Jemez could be evacuated within a very short time.
The previous chapters have discussed the story of the Jemez, from the birth of Northern New Mexico 1.8 billion years ago to the deposition of alluvium in the modern stream drainages. The following animations depict this history.
The first animation shows the exposure maps you've seen throughout the preceding chapters as an animation.
The next animation is similar, but is cumulative in time, adding successively younger exposures.
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Clownie the Wonder Car
Copyright © 2015 Kent G. Budge. All rights reserved.