Showing posts with label Hole in the Wall. Show all posts
Showing posts with label Hole in the Wall. Show all posts

Saturday, June 23, 2018

Home From Back of Beyond: Images of a Harsh Country, Part One


Sunset through wildfire smoke at Arches National Park, Utah
If you are familiar with the Chronicles of Narnia, you will remember the novel where the children go through the wardrobe into a magical world and live out their lives to adulthood. At the end of the story they step through the wardrobe back into our world where they are once again children. Little actual time had passed. A journey through alien lands like those of the Colorado Plateau is much the same. One can work and sleep and study and weeks will pass and little will change in one's life. Then, you are ripped away from everyday life and spend two weeks exploring corners of the world that you barely believed existed and each day, each hour is a life-changing experience. More happens in just two weeks than will happen in months or years of an everyday life.
The Rings Trail through Banshee Canyon in the Mojave National Preserve
I've been doing trips like this across the Colorado Plateau for 34 years now, and each one has been unique. There have been new insights and new discoveries every time. Sometimes there have been scary moments, and there have been moments of inspiration and beauty that border on the sacred. Our journey this year was no exception. I got to know twenty unique people, and we shared some interesting times together. I will no doubt have much to say about the geology and natural history of the places we visited in future blogs, but for the moment, I've gone through my 2,300 pictures and selected some of my favorites. It will take several posts!

The Mojave National Preserve is not actually part of the Colorado Plateau, but we needed a place to stay on the way there, and I can't think of a more interesting spot than Hole-in-the-Wall and Banshee Canyon (above). There's a trail that winds through the bizarre canyon with rings placed in strategic spots to allow access. It's not the plateau, but there is a connection: 18.5 million years ago a colossal rhyolite caldera eruption sent ash drifting across a vast region. The same ash exposed on the Rings Trail is also found on parts of the rim of the Grand Canyon near Peach Springs, Arizona.
The walls of Zion Canyon from Watchman Campground
We spent a night at Zion National Park which is crowded beyond all reason these days. Too many people want to share a very small space, and the experience of seeing the park is diminished by the crowds. The obvious answer is to make more parklands available, but our government is going the opposite direction, unfortunately. Still there are moments of peace and beauty. The red rock country is always more astounding at the beginning and the ending of each day when the canyon walls are lit by the horizon-level sun. I woke up at 5:45AM to see the sunlight on the canyon wall opposite our camp, and all was quiet. I could have been the only person there at that moment for all I could hear.
 The Transcept Trail follows the rim over the Transcept, a deep tributary to Bright Angel Creek which is itself a tributary tot he Colorado River. In any other place a canyon like this would be its own national park.
Grand Canyon National Park is another place where crowding is rampant and the atmosphere is much like Disneyland. But Grand Canyon is a much larger park, and there are many places where one can find peace. For one thing, a person can visit the North Rim, which gets a mere 10% of park visitation. And once there, walk a little bit. I spent an hour one afternoon walking the Transcept Trail, and saw only three or four people. I snapped the shot above from one of the many overlooks along the way.
The view upstream of Navajo Bridge over the Colorado River
The canyons of the Colorado River are rugged, to say the least (the Grand is just one of them). For decades Lee's Ferry was the only crossing for more than two hundred and fifty miles downstream (and almost as much upstream). In 1928 the Navajo Bridge was completed, allowing auto traffic to make the crossing unimpeded. The bridge was not designed for modern trucks and was augmented in the 1990s with a twin bridge of greater strength. The old bridge is now a walkway, and one can stand 700 feet above the Colorado River just a few miles downstream of the old ferry. California Condors soared overhead while we were there. I chose this picture because of the memories it stirred of my incredible journey down the Colorado in 2013 with my brother's family. The bridge was the last recent piece of human architecture we would see for nine or ten days. I was a tiny bit jealous of the rafters passing below, but I was on an epic journey of my own with a bunch of special people.
Horseshoe Bend on the Colorado River near Page, Arizona
A short distance up the road was another imposing sight, the Horseshoe Bend on the Colorado River. It's just a few miles downstream of Glen Canyon Dam, and was a local secret for a long time. Word is out now and the small dirt parking lot is often overrun with buses and tourists hiking in inappropriate shoes and without hats in the stifling (and dehydration-producing) heat. It is in the process of falling victim to "industrial tourism" as authorities are constructing a parking lot, a concrete pathway, and some fencing at the cliff edge. I guess the "improvements" are necessary, given the stupid chances I saw people taking to get their selfies on the cliff edge.
House on Fire Ruin in Mule Canyon. I photographed the ruin years ago without realizing the presence of the "flames" formed from differential weathering of crossbeds in the sandstone.

My most treasured moment came the next day. We were headed to one of the important cultural sites on the entire Colorado Plateau. A thousand years ago, Cedar Mesa was one of the most critical agricultural landscapes in the entire region, being a thousand feet above the barren deserts of Monument Valley and Mexican Hat, and thousands of feet below the mountains that were coated in snow for much of the winter. It was the sweet spot for growing large yields of beans, squash and maize. For centuries thousands of the Ancestral Pueblo people made the mesa their home, building villages on the mesa top, and cliff dwellings and pithouses in the alcoves just below the rim. They left the region totally in the late 1200s leaving behind thousands of cultural sites that are still only beginning to be assessed and excavated. Five regional tribes consider the lands to be sacred.
Pictographs on sandstone near House on Fire Ruin
The region is public land, managed by the Bureau of Land Management, a chronically underfunded part of the federal government. The archaeological sites have been ravaged by the resident pothunters and grave robbers who live in the region and think that these resources are their own personal cash cow. I read somewhere that around 90% of the known sites have been attacked by pothunters, sometimes using picks and shovels, sometimes with bulldozers. They'll even charter helicopters to fly them into remote sites. With this vandalism in mind, politicians and stakeholders worked for years to propose a national monument, and when Congress failed to act, President Obama made the monument a reality. Bear's Ears National Monument was established in 2016. In an egregious betrayal of the law, the present administration shrunk the monument by 90%. The act is being challenged in court, but mining companies are already staking claims. It's a hideous shame.
Ruins in Mule Canyon
We walked up Mule Canyon listening for the ghosts of those who came before. We found House on Fire ruin, some eerie hand prints on an overhanging rock, and several other incredible ruins (a long way) up the canyon. I walked six miles in the hot sun with not enough water (I don't recommend walking with insufficient amounts of water). It had been around fifteen years since I last traveled up the canyon.
One of my special moments happened as I was waiting for two new tires to be installed after we got a series of flats. Right there in the city limits of Cortez, Colorado there was a little prairie dog town. They ducked every time a car went by.

The picture above needs explanation. That's a cloud, yes, but an unusual one. It's a pyrocumulus cloud, generated by the disastrous La Plata (416) Fire that was burning north of Durango, Colorado. Huge plumes of superheated air rise and cool in the upper atmosphere, condensing to form the gigantic clouds. Unfortunately they don't produce any significant precipitation (wouldn't it be nice if wildfires came with their own extinguishers?). But looking at the drought-induced fire burning beyond the ruins of Mesa Verde caused me to consider the "cycle of life", or more correctly the cycle of human habitation. Many hypotheses concerning the abandonment of the region by the Ancestral Puebloans involve extended droughts and overuse of the available resources. The drought in 1285 AD had lasted around 25 years.

We are currently in another drought that has now lingered for two decades. The Colorado River supplies water for cities and farms across the entire southwest, but the two giant reservoirs that store most of the water are barely half full, and if the drought continues (as predicted by some global warming scenarios), the lakes will become useless pools and cities throughout the region will be in serious trouble as a result. The Ancestral Pueblo people left for wetter climates 700 years ago. What alternatives will the current residents have?

These are my favorite pictures from the first six days of our journey. More will be coming!

Friday, April 6, 2018

An Incredible Spot in the Mojave Desert, the Hole in the Wall. You could see it for yourself this summer

Summer is coming soon. If you are casting about wondering what to do, how about the adventure of a lifetime? Our department is offering a dyad class, Geology 191/Anthropology 191, the Geology and Anthropology of the Colorado Plateau, and it is an incredible chance to check out some marvelous geology along our southwestern tier of states: California, Arizona, Colorado, Utah, and Nevada. I want to give you a bit of a preview of the kinds of places we will be visiting...
The Mojave National Preserve is one of our nation's newest parks (established in 1994). It was carved out from Bureau of Land Management lands in the eastern Mojave Desert, preserving one of the most awesome sand dune complexes in the country, the Kelso Dunes, a barren landscape of geologically recent volcanic cinder cones, one of the largest Joshua Tree forests in existence, and some of the highest mountain ranges in the Mojave Desert, with rocks as old as 1.7 billion years old, as ancient as those in the bottom of the Grand Canyon. The preserve also encompasses a California State Recreation Area, the Providence Mountains, and Mitchell Caverns, a unique limestone cave system. The caverns were closed during the recession, and then severely vandalized, but they have finally been reopened for visitation (see this Facebook page for updates).
One of the most interesting corners of the park is called Hole in the Wall, along with Banshee Canyon. We will be staying at the nearby campground our first night on the road on June 2. It is a wonderfully isolated spot, 25 miles off the main highway, and even farther from developments of any kind. It has some of the darkest night skies I've ever seen, and it is serenely quiet (except for crickets and coyote yowls).
The region is quite unlike other parts of the Mojave. Instead of deeply eroded mountain ranges and wide flat valleys, the area around Hole in the Wall is composed of mesas and plateaus that seem to share more in common with the Colorado Plateau province just to the east. But these mesas aren't like Arizona's either. They are composed not of sedimentary layers, but of volcanic tuff, rock derived from unimaginably huge volcanic explosions the likes of which modern humans have never experienced.
Twenty million years ago, the region was one of low relief, the result of tens of millions of years of erosion and relative stability. But conditions were changing as the crust was stretched and broken up into a series of tilted fault blocks. The release of pressure on the underlying mantle allowed partial melting to take place, and volcanic activity exploded across the region.
The first eruptions took place about 18.5 million years ago when the Peach Springs tuff coated the entire region from an eruption center near Oatman, Arizona. The eruption involved as much as 150 cubic miles (640 km3) of powdery white ash that was so hot that in many places it welded into solid rock as it landed.
Shortly afterward (in geologic terms anyway, as it was 700,000 years later), a second caldera developed. It was located even closer, in the adjacent Woods Mountains. The eruptive "crater", actually a collapse pit, was about 5-6 miles across, roughly similar in size to Crater Lake. Once again, all life was obliterated for hundreds of square miles as hot ash blanketed the landscape. The Wild Horse Mesa Tuff makes up most of the rock found at Hole in the Wall.
The strange holes that gave Hole in the Wall its name are called tafoni. Small differences in the degree of solidification or cementation cause depressions to form which end up staying wet longer, and the minerals decay into small fragments that can easily wash or blow away.
A short trail (1.5 miles) loops around Banshee Mountain and explores the best of the eroded tuff. Starting at the small visitor center, the trail drops through a rugged narrow canyon. There are some drop-offs, but rings have been attached to the canyon wall, making it a lot easier to climb up or down. Once past the narrows, the trail has a gentle gradient, and provides interesting views in all directions. There is a nice collection of petroglyphs on some of the boulders around the south end of the mountain.
If you want to visit this fascinating corner of the desert with us this June, please check out the previous post for details. We will be on the road for two weeks, and this will be only the first of many wonders that we will explore.

Monday, December 28, 2015

Dreams of Summer and Southwest Travels: Hole in the Wall, Mojave National Preserve

Christmas is over and suddenly the snow and blizzards aren't so fun any more. I find myself dreaming of warmer places and times, including a great journey we took last summer across the southwest with my students. Since my current travels are over until February, I'm going to travel through the archives to check out some marvelous geology along our southwestern tier of states: Arizona, New Mexico, Colorado, Utah, and Nevada. But really, no place is more southwestern than California, where we will start this journey.
The Mojave National Preserve is one of our nation's newest parks (established in 1994). It was carved out from Bureau of Land Management lands in the eastern Mojave Desert, preserving one of the most awesome sand dune complexes in the country, the Kelso Dunes, a barren landscape of geologically recent volcanic cinder cones, one of the largest Joshua Tree forests in existence, and some of the highest mountain ranges in the Mojave Desert, with rocks as old as 1.7 billion years old, as ancient as those in the bottom of the Grand Canyon. The preserve also encompasses a California State Recreation Area, the Providence Mountains, and Mitchell Caverns, a unique limestone cave system. The caverns were closed during the recession, and then severely vandalized, but there are hopes that they will reopen in 2016 (see this Facebook page for updates).
One of the most interesting corners of the park is called Hole in the Wall, along with Banshee Canyon. We stayed at the nearby campground our first night on the road. It is a wonderfully isolated spot, 25 miles off the main highway, and even farther from developments of any kind. It has some of the darkest night skies I've ever seen, and it is serenely quiet (except for crickets and coyote yowls).
The region is quite unlike other parts of the Mojave. Instead of deeply eroded mountain ranges and wide flat valleys, the area around Hole in the Wall is composed of mesas and plateaus that seem to share more in common with the Colorado Plateau province just to the east. But these mesas aren't like Arizona's either. They are composed not of sedimentary layers, but of volcanic tuff, rock derived from unimaginably huge volcanic explosions the likes of which modern humans have never experienced.
Twenty million years ago, the region was one of low relief, the result of tens of millions of years of erosion and relative stability. But conditions were changing as the crust was stretched and broken up into a series of tilted fault blocks. The release of pressure on the underlying mantle allowed partial melting to take place, and volcanic activity exploded across the region.
The first eruptions took place about 18.5 million years ago when the Peach Springs tuff coated the entire region from an eruption center near Oatman, Arizona. The eruption involved as much as 150 cubic miles (640 km3) of powdery white ash that was so hot that in many places it welded into solid rock as it landed.
Shortly afterward (in geologic terms, anyway, as it was 700,000 years later), a second caldera developed. It was located even closer, in the adjacent Woods Mountains. The eruptive "crater", actually a collapse pit, was about 5-6 miles across, roughly similar in size to Crater Lake. Once again, all life was obliterated for hundreds of square miles as hot ash blanketed the landscape. The Wild Horse Mesa Tuff makes up most of the rock found at Hole in the Wall.
The strange holes that gave Hole in the Wall its name are called tafoni. Small differences in the degree of solidification or cementation cause depressions to form which end up staying wet longer, and the minerals decay into small fragments that can easily wash or blow away.
A short trail (1.5 miles) loops around Banshee Mountain and explores the best of the eroded tuff. Starting at the small visitor center, the trail drops through a rugged narrow canyon. There are some drop-offs, but rings have been attached to the canyon wall, making it a lot easier to climb up or down. Once past the narrows, the trail has a gentle gradient, and provides interesting views in all directions. There is a nice collection of petroglyphs on some of the boulders around the south end of the mountain.
If you want to visit this fascinating corner of the desert, you'll have to search it out. It's not a quick roadside stop, but is instead a place to take a bit of time to explore. The time is well worth it!

Sunday, June 28, 2015

Home From the Back of Beyond: Some Images of Strange and Wonderful Places

Thunderstorm near Bandelier National Monument
No, it's not a volcanic eruption, but with the light show that followed that evening, it might as well have been. We were in the high desert of New Mexico at Bandelier National Monument, and the monsoons had arrived early. The lightning flashed every second or two for hours that night. It was magical.
Joshua Trees outside of Rainbow Basin, Mojave Desert of California
I'm back from a long, but epic journey with my students through one of the most intriguing landscapes in North America, the Colorado Plateau. We crossed the California deserts to Arizona and New Mexico, swinging north through southwestern Colorado and southern Utah. Our last few days brought us through the Basin and Range Province of western Utah and Nevada.
Banshee Canyon in Hole in the Wall, Mojave National Preserve
As with all trips, I try to do new things whenever I can, but the real purpose was to open a different world to our students. This class was a hybrid course that explored the geology and archaeology of the region. It's a marvelous region for doing such a class, as humans have impacted the landscape, and the landscape has left its mark on humans.
The Citadel ruin and San Francisco Peaks from Wupatki National Monument, Arizona
The land has seen a parade of cultures over the centuries. Understanding why they abandoned the region in the past has a lot to do with understanding the limits of life there today. Sometimes the problems are the same. The Ancestral Puebloans may have left because of 25 year drought. We are in the midst of a 15 year drought today, although we experienced a very short reprieve from the dryness. A lot of ran fell in the weeks before our arrival. The desert was unusually green for this time of year.
Meteor Crater was impressive as always, a reminder that sometimes situations on our planet change in a hurry.
The Crystal Forest at Petrified Forest National Park, Arizona
Some of our stops were familiar to most people, such as Petrified Forest National Park. People may have heard of it, but many haven't visited. It's a bizarre landscape of badlands topography and horizontal forests of trees that wouldn't be out of place in the Redwood forests of California, yet are more than 200 million years old.
The slot canyon at Kasha Katuwe Tent Rocks National Monument
Other places are exceedingly obscure, although they don't deserve to be. Kasha Katuwe Tent Rocks National Monument is one of those places. Unless you are from Cappadocia, Turkey, it is one of the most unusual landscapes you'll ever see. The slot canyon is one of my favorite hikes anywhere.
The greenery was really pretty stunning after fifteen years of crippling drought. The drought is not broken by any means, but the rainy conditions over the last few weeks allowed us to imagine this landscape under a different climate regime. At Chaco Culture National Historical Park, the rangers described the plant growth as the most intense they had ever seen. The elks wandering near the campground were looking downright fat (of course the doe was probably about to drop a calf).
Chaco Canyon represented the height of the political power of the Ancestral Puebloans, in the period around 1150 AD. By the 1200s they were building the fortresses of the cliff-dwellings in Mesa Verde. It wasn't the culmination of their society, but the prelude to abandonment. Whatever the reason, the canyons fell silent around 1285. The people had migrated south and east into the Hopi mesas area and the riverlands of the Rio Grande in New Mexico.
Cliff Palace in Mesa Verde National Park, one of the largest of the cliff cities.
One of our stops was especially eerie. Castle Rock was one of the last of the Ancestral Pueblo dwellings to be constructed. It came to an end after only a decade or two with a massacre. Archaeologists discovered more than three dozen slaughtered people in the excavations.
Castle Rock, in Canyons of the Ancients National Monument
The last part of our trip went back to the geological aspects of the plateau country. Despite having visited the Natural Bridges National Monument nearly two dozen times over the years, this was the first time I was able to hike under Sipapu Bridge, probably the second largest natural bridge in the world. The opening is more than 200 feet high, and from the bottom, it is immense. Those are mature cottonwood trees in the picture below!
Sipapu Bridge in Natural Bridges National Monument
We made the very hot hike to Horseshoe Bend near Glen Canyon Dam on the Colorado River. An entrenched meander, the loop formed when the land rose, trapping a river in its floodplain pattern. The stunning cliffs are composed of the Navajo Sandstone, the remnants of a Jurassic-aged sand dune "sea" that once covered many western states.
Horseshoe Bend, near Glen Canyon Dam. The Colorado River runs clear because the dam has captured the silt that once gave the river its name. Algae is able to thrive in the clear water.
The culmination of the Navajo Sandstone is found at Zion National Park in southern Utah. The Virgin River has carved an incredibly deep slot canyon at the Narrows. In many places the river fills the entire valley floor, meaning a hike is a wet affair. I didn't hesitate!
So, I am home for a couple of days, and will try to pick up the pace with a few long-delayed blog entries. You can certainly expect more information from our last couple of trips in the plateau country as well! It's good to be home for a spell.

Thursday, July 4, 2013

Out in America's Never Never: The Mojave, a Vast Unknown Treasure

My students are reading this and saying "We didn't stop here". That's true. But I love the picture and any excuse to show it.

The first morning on the road into America's Never Never found us at Hole in the Wall in the middle of the Mojave National Preserve. The Mojave is a vast region in eastern California that is both well-known, and completely unknown to the residents and visitors to the state. It's "known" because millions of people travel Interstates 15 and 40 every year through the region on their way to Las Vegas or Phoenix. It's "unknown" because the vast majority of travelers never set foot outside their cars except for the bathrooms in Baker or Needles. The landscape between the two interstates is a vast terra incognita to them. It's no wasteland...it is an exceedingly fascinating region, geologically and biologically.
We did wake up to this sight, though. The Providence Mountains, west of Hole in the Wall.

We passed through the heart of the park, traveling from the Essex turnoff on Interstate 40 for 20 miles to the Hole in the Wall campground, and then through the Mid Hills and Mojave Road to Kelso-Cima Road and the Morning Star Mine Road to Interstate 15. Although our time was short, we saw some vast vistas of the third largest unit in the national park system outside of Alaska (I think only Yellowstone National Park and Death Valley National Park are larger; Grand Staircase-Escalante National Monument is also larger, but is administered by the Bureau of Land Management).

The park has a series of unique ranges, including the Providence, Granite, Clark, and New York Mountains, reacing elevations of just short of 8,000 feet. The great range of elevation allows a huge variety of plants to thrive. Of greatest interest (to me anyway) are the Joshua Trees and the White Firs.

Wait, Christmas trees in the desert? Yes! There are relict forests that cling to life at the tops of the highest peaks of the New York and Clark Mountains. During the ice ages when the climate was wetter, they thrived over a much larger area, but with the ending of the glacial advances and the drying, they retreated to the small groves that exist today. It's a part of the park I have not yet had the privilege to visit, and I can't find pictures on the Internet, so that may be part of a future trip.
Photo by Mrs. Geotripper

The Joshua Trees, on the other hand, are right there. The largest grove in existence, more than a million individual trees, can be seen on Cima Dome. We stopped to have a look. The Joshua Trees are members of the lily family and are widespread throughout the Mojave Desert. Joshua Tree National Park preserves many of the trees, but Mojave National Preserve may actually have more of them. Some of the trees on Cima Dome have trunks 3 feet across, and may be centuries old.
Cima Dome

Cima Dome is one of the more unusual geological structures found in the Mojave Desert. The smooth gravel covered convex surface was thought at one time to be the end result of desert erosion of a faulted mountain block and pediment, but the origin may be more complicated. The Cima Volcanic Field on the west side of the dome may be related. Lava flows range in age from 7 million years to as recently as 10,000 years ago. The top picture of today's post was taken in a lava tube that is part of one of the recent flows.
Photo by Mrs. Geotripper

From our perch high on Cedar Canyon Road, we could look south and see the Kelso Dune Field, one of the highest and largest sand dune systems in the country. The highest dune rises 650 above the surrounding desert. Numerous endemic species of plants grow in the dune environment, but the dunes are best known for "singing". Under the right conditions, the dunes "boom", but the reasons aren't clear.
Kelso Dunes
I have saved my outrage for the last aspect of the park region. Providence Mountains State Recreational Area is an island of state land within the National Preserve. It "preserves" a group of caves, including the Mitchell Caverns and the Cave of the Winding Stair. Originally in private ownership, the state promised to care for the caves and for years conducted tours and kept up the small but charming campground.
Cave shields are a rare cave feature found in Mitchell Caverns (source: National Park Service)
But the recession destroyed the state budget, and the SRA was slated to be shut down. Even when money was found to keep the other parks open, Mitchell Caverns were shut down because the two rangers working there elected to retire. The park was gated and abandoned. The administrators of the park system must have assumed that distance and isolation would protect the facility. Administrators think that way. They were, of course, very wrong.
(source: National Park Service)
Vandals broke into the park visitor center, destroying exhibits, stealing equipment, and removing thousands of feet of copper wire that was used to light the cave. If the park is ever to be reopened, it will cost a great deal more to fix what has been damaged than it would have been to keep a caretaker on site.
(source: National Park Service)
There are hints that the state might be thinking about fixing things now that the state budget is in better shape. I hope they consider bringing back one of the gems of the state park system.

We made our way north out of the Preserve and made our way to the bathrooms and mini-marts over the border in Nevada.