Geology Archives - Page 3 of 15

March 16, 2020May 18, 2020

Imaginary Wanderings

I’ve fancied a certain type of wandering lately—to grab my pack and boots and walk the lines of Utah’s political border—a trail made not of dirt and stone, but of imaginary lines of latitude and longitude. But, as of yet, I haven’t found the time or resources to do so beyond my own imagination and the 3 or 4 minutes I have with you now. Come join me in a stroll around Utah, at least the way I’ve imagined it.

Walking north out of Logan, I’ll wander through the grid-patterned neighborhoods that pepper the flanks of the Bear River Range, the still-snowy peaks that serve as sentinels over my daily commute and the adventure on which I embark now. They serve another, greater purpose, too, though. Without the Bear Rivers, the Rocky Mountains would be otherwise dissected. The snowy peaks I adore and which now pass in slow motion over my right shoulder form the only range of mountains that connect the northern and southern Rockies. Though they only measure about 70 miles in length, they provide a critical ecological thoroughfare from the south end of Cache Valley, Utah, north to Soda Springs, Idaho.

I won’t follow them that far, though. I’ll turn left (west) at the Idaho border toward the Great Basin.

I’m technically already there. We all are if we live along the Wasatch Front. And there are just a few minor ranges—the Clarkston Range, Blue Spring Hills, and the northern fingerling ridges of the Promontory Mountains—to wander across before reaching the Great Basin proper.

My favorite hidden gem of this often-overlooked portion of Utah are the Raft River Mountains. Like the mighty Uintas to the east, the Raft Rivers run East-to-West. So, despite being a stone’s throw from the Great Salt Lake, the tributaries running off their northern flanks drain not into the Great Basin and the Great Salt Lake, but north onto the Snake River Plain toward the Columbia River and, eventually, the Pacific Ocean.

The Tri Corners Landmark is a simple granite pillar sticking 3 or 4 feet out of the sand amongst wind-whipped sage brush. It’s easy to miss, but marks some interesting irregularities. Utah’s political border is not, in fact, made up of straight lines. According to cartographer Dave Cook, surveyors who created the state’s initial boundaries hastily covered ground with their crude survey instruments. They were paid by the mile, so they were more interested in finishing quickly than correcting any errors they made along the way.

The border wiggles at least four times by my calculations—one of which comprises two right angles—as it wanders across ridgelines and through the dusty draws of the basin and range mountains toward the Mojave Desert of southwest Utah.

Imaginary Wanderings: The wrinkled topography if the Colorado Plateau Courtesy & Copyright Josh Boling, Photographer — The wrinkled topography if the Colorado Plateau
Courtesy & Copyright Josh Boling, Photographer

I won’t be there for long, though. The border only runs for roughly 50 miles along the two legs of the right triangle that constitutes Utah’s allotment of the Mojave Desert before it climbs up onto the Colorado plateau. Ed Abbey famously compared the wrinkled topography of Utah, particularly his beloved canyon country of the Colorado Plateau, to the two largest of our states. “Alaska is our biggest, buggiest, boggiest state,” Abbey wrote. “Texas remains our largest unfrozen state. But mountainous Utah, if ironed out flat, would take up more space on a map than either.” Ropes, technical climbing and canyoneering gear, and a fair amount of fortitude would be required here.

The eastern border we share with Colorado is a varied expanse of high desert plateaus, rugged cliffs, out-of-place riparian zones, and a few spectacular snow-capped mountain ranges leading through some of the most beautiful and gloriously desolate places on the planet. The Book Cliffs, Dinosaur National Monument, and the La Sal Mountains come to mind.

A short walk distance-wise would require heaps of route finding across the Green River’s Flaming Gorge and along the northern toes of the Uinta Mountains. Here is perhaps the greatest of Utah’s geologic juxtapositions. Low basins adjacent the Intermountain West’s highest peaks.

Imaginary Wanderings: A view of the high Uintas from their northern foothills Courtesy & Copyright Josh Boling, Photographer — A view of the high Uintas from their northern foothills Courtesy & Copyright Josh Boling, Photographer

I’ll take my first right turn at the western edge of the Uinta foothills. Here I might skip the formalities of a longitudinal walk—stick my thumb out instead, and make a bee-line for Bear Lake, Logan Canyon, and home: the walks I’ve already known for some time.

Perhaps you’re inspired now to know parts of this walk better yourself.

I’m Josh Boling, and I’m Wild About Utah!

Credits:

Imaginary Wanderings:
Photos: Courtesy and Copyright Josh Boling, Photographer
Audio: Includes audio from
Text: Josh Boling, 2020, Edith Bowen Laboratory School, Utah State University

Sources & Additional Reading

Boling, Josh, Why I Teach Outside, Wild About Utah, November 11, 2019, https://wildaboututah.org/why-i-teach-outside/

Kiffel-Alcheh, Utah, National Geographic Kids, https://kids.nationalgeographic.com/explore/states/utah/

The Geography of Utah, NSTATE LLC, https://www.netstate.com/states/geography/ut_geography.htm

Fisher, Albert L, Physical Geography of Utah, History to Go, Utah Division of State History, https://historytogo.utah.gov/physical-geography-utah/

November 4, 2019July 10, 2020

A Short History of Logan River

Over fifteen thousand years ago, the glacially fed Logan River was flowing into Lake Bonneville which covered most of the NW quadrant of the state and completely filled Utah’s Cache Valley.

The river met the ancient Lake Bonneville some distance up Logan Canyon so it was much shorter. Animals that lived along the river included saber-toothed cats, woolly mammoths and giant ground sloths.

About ten thousand years later, after Lake Bonneville had disappeared, the Logan River meandered across the old lake bed and the Shoshone Native American tribe made Cache Valley their home.

Shoshone Women and Children. Photo taken in 1870, Unknown photographer. Courtesy USU Digital History Collections.

Frank Howe, chairman of the Logan River Task Force, adjunct associate professor, and university liaison for Utah Division of Wildlife Resources said, “When people say ‘let’s return Cache Valley to how it was naturally’ they don’t realize the valley [had been] managed by the Shoshone for thousands of years before the settlers arrived.”

The Shoshone burned the valley frequently to drive the Bison and provide better forage for their horses. This impacted the vegetation across the valley and along the river. Instead of large stands of tall trees, the river was lined with shrubs which responded better to fire, hence the valley’s first name Willow Valley.

Water flowing in Right-hand Fork one of the tributaries of Logan River. Courtesy & Copyright Shauna Leavitt

During this time the flow and movement of the Logan River was much different, in part because of the beaver families who built their homes and dams up and down the waterway. The dams created ponds whose waters seeped into the valley bottoms raising the water table and saturating the sponge. Joseph Wheaton, associate professor of the Department of Watershed Sciences in the Quinney College of Natural Resources explained, “the saturated ground increased resilience to drought, flood and fire.”

In the early 1800s trappers arrived in the valley.

Michel Bourdon was one of the earliest trappers to see Cache Valley around 1818. The river was, for a short time, named after him. A few years later, Ephraim Logan arrived in Cache Valley. He and many other trappers attended the Rocky Mountain Rendezvous along the Bourdon River in 1826. Shortly thereafter, Logan died during one of his outings and the area’s trappers decided to rename the river Logan, in his honor.

Trapping for the fur industry severely impacted the beaver population and the Logan River. The dam building beavers were almost trapped to extinction because of the European fashion demand. Luckily, fashion trends changed before beaver were extinct. However, the virtual elimination of beavers fundamentally changed the character of the Logan River to this day.

Man fly-fishing in Logan River, Logan Canyon, Utah, July 21, 1937. Courtesy of USU Digital History Collections.

In the 1850s the first settlers arrived in Cache Valley. Their arrival had a large impact on Logan River. Within a year they began constructing the first canal for irrigation.

Logan’s Main Street about 1920, Courtesy of Darrin Smith

Around the turn of the 19th century it became apparent the grazing and timber need of the settlers had been hard on the Logan River and the surrounding landscape. Albert F. Potter surveying the Logan River watershed for President Theodore Roosevelt, reported the canyon had been overgrazed and its timber overcut. The timber, at the time, was used for railroad ties and to build Logan City.

Logan Canyon about 1910. Four waterways: the aquaduct which was used for power generation, the canal, a water way that ran behind the building which had been part of the old Hercules Power Plant, and the Logan River. Photographer H.G. Hutteballe, Courtesy of Darrin Smith Photo Collection

As the valley’s population grew, so did the demand for Logan River water.

Color enhanced photo 1910 photo of Logan Canyon Courtesy Logan Library — Color enhanced photo 1910 photo of Logan Canyon
Courtesy Logan Library

Over the next few months, Wild About Utah will continue this series on the Logan River to tell the stories about its ecology, social value, and how humans have worked together to make it a community amenity not just a canal.

We hope you’ll join us as we learn more interesting facts about Logan River.

This is Shauna Leavitt and I’m wild about Utah.

Credits:
Photos: Courtesy & Copyright ©
Audio: Courtesy & Copyright © Friend Weller, Utah Public Radio
Text: Shauna Leavitt, Utah Cooperative Fish and Wildlife Research Unit, Quinney College of Natural Resources, Utah State University
Co-Authored by: Frank Howe, chairman of the Logan River Task Force, adjunct associate professor, and university liaison for Utah Division of Wildlife Resources.

Sources & Additional Reading

Geologic Map of the Logan 7.5′ Quadrangle, Cache County, Utah, Utah Geological Survey, 1996, https://ugspub.nr.utah.gov/publications/misc_pubs/mp-96-1.pdf

Williams, Stewart J. Lake Bonneville: Geology of Southern Cache Valley, Utah, Geological Survey Professional Paper 257-C, US Department of the Interior, 1962, https://pubs.usgs.gov/pp/0257c/report.pdf

Biek, Bob; Willis, Grant; Ehler, Buck; Utah’s Glacial Geology, Utah Geological Survey, September 2010, https://geology.utah.gov/map-pub/survey-notes/utahs-glacial-geology/

Hylland, Rebecca, What are Igneous, Sedimentary & Metamorphic Rocks?, Glad You Asked, Utah Geological Survey, https://geology.utah.gov/map-pub/survey-notes/glad-you-asked/igneous-sedimentary-metamorphic-rocks/

October 14, 2019July 10, 2020

Utah’s Desert Paradox

Have you ever wondered why the redrock landscape of Southeastern Utah ebbs and flows, why the exposed layers of sedimentary rock seem to rise and fall in crests and troughs like so many waves across the surface of the sea? Well, the answer, surprisingly enough, can be found through investigating the ancient seas that once covered vast swathes of Southeast Utah more than 300 million years ago.

Utah's Desert Paradox: Salt Diapir Courtesy Geology.com — Salt Diapir
Courtesy Geology.com

Back then, the allotment of Earth’s crust that would one day become the Beehive State was located along the western edge of a chain of islands that rose above a shallow, equatorial sea. 15 million years of sea level rise, recession, and evaporation left behind layer upon layer of salt deposits that would eventually measure nearly a mile thick. These salt deposits were subsequently covered and crushed by vast layers of sediment, rock, and debris eroded from the flanks of the Ancestral Rocky Mountains. Under the tremendous weight of these additional layers, the now lithified layers of salty stone softened and squirted west like toothpaste through a tube until they collided with deep tectonic faults. Here, they erupted upward, forcing the younger, denser rock layers into anticlinal arched domes, called diapirs, resembling the crests of waves. This phenomenon works much like a waterbed across the landscape: heavier rock layers squirting salt into thinner layers of rock that then bulge upward before they are subsequently squashed downward again by even more sediment, rock, and debris. The subterranean movement of salt through rock layers becomes a game of geologic whack-a-mole.

Utah's Desert Paradox: Cane Creek Anticline Canyonlands National Park Courtesy USGS, Public Domain, Photo id: 249988 — Cane Creek Anticline
Canyonlands National Park
Courtesy USGS, Public Domain, Photo id: 249988

I recently visited Dead Horse Point State Park between the town of Moab and Canyonlands National Park. On the eastern edge of the rising mesa on which the park is located, one can look out across millions of years’ worth of sedimentary deposits toward the Cane Creek Anticline, an obvious salt diapir that seems to rise straight out of the Colorado River. Perhaps the most famous (and most contested) salt diapir in the area, though, is that of Upheaval Dome, located in Canyonlands National Park. An alternative theory to the creation of Upheaval Dome maintains that an ancient meteor impact created the crater where Upheaval Dome is located. However, the fracturing of the younger Wingate Sandstone that occupies the higher rock layers is indicative of a salt diapir formation. Yet, debate rages on!

Utah's Desert Paradox: Paradox Basin Overview Courtesy & Copyright Buffalo Royalties — Paradox Basin Overview
Courtesy & Copyright Buffalo Royalties

Funnily enough, the discovery of this layer of ancient salt deposits that wreaks so much havoc below the Earth’s surface was made in the collapsed center of an ancient salt diapir. In 1875, geologist and surveyor Albert Charles Peale, at the time yet unaware of the salt tectonics at work beneath the Colorado Plateau, noted the paradoxical course of the Delores River. As Peale and his colleagues would find out, the geography of the collapsed salt diapir caused the river to chart a perpendicular course through its valley as opposed to a parallel course as is most often taken by rivers. This paradox of fluvial geomorphology gave the place its name, Paradox Valley. Likewise, the subsequent discovery of an entire basin of ancient salt deposits borrowed the name “Paradox.” Now, we know the salty layer as the Paradox Formation of rocks found throughout the Paradox Basin of the Colorado Plateau.

Utah's Desert Paradox: Paradox Valley Courtesy & Copyright GJhikes.com — Paradox Valley
Courtesy & Copyright GJhikes.com

This paradox of fluvial geomorphology can also be found where the Colorado River cuts a perpendicular course across the Spanish Valley of Moab and is indicative of a vast layer of ancient salts below the surface, waiting to further morph the landscape into crests and troughs of rocky waves that ebb and flow across the landscape. The next time you venture into this part of our great state, stop and consider the remnants of ancient seas below your feet that project their image into the surface of the redrock above.

I’m Josh Boling, and I’m Wild About Utah.

Utah’s Desert Paradox-Credits:

Photos: Paradox Basin Overview, Courtesy and Copyright Buffalo Royalties
Upheaval Dome Courtesy Wikimedia, https://commons.wikimedia.org/wiki/File:UpheavalDomePanorama.jpg
Salt Diapir Courtesy Geology.com, https://geology.com/stories/13/salt-domes/
Paradox Valley Courtesy GJhikes.com, https://www.gjhikes.com/2017/10/long-park.html
Cane Creek Anticline Courtesy USGS (Photo id: 249988 – Canyonlands National Park, Utah. Cane Creek anticline, looking northeast toward the La Sal Mountains from Dead Horse Point. The Colorado River cuts across the crest at the middle right, above which is Anticline Overlook. A jeep trail and part of Shafer dome lie below. Figure 13, U.S. Geological Survey Bulletin 1327. – ID. Lohman, S.W. 10cp – lswc0010 – U.S. Geological Survey – Public domain image)
Text: Josh Boling, 2018

Utah’s Desert Paradox-Additional Reading

Davis, Jim, Glad You Asked: Why Does A River Run Through It?, Glad You Asked, Utah Geological Survey, https://geology.utah.gov/map-pub/survey-notes/glad-you-asked/why-does-a-river-run-through-it/

What is a Salt Dome?. Geology.com, https://geology.com/stories/13/salt-domes/

Utah’s Desert Paradox

July 22, 2019July 10, 2020

The Colorado Plateau

If you have ever been to a museum you have witnessed historical items that may be hundreds, or thousands of years old. When we look outdoors at the natural geology of our planet earth, we may be witnessing things that are hundreds of thousands, or even millions of years old.

I realize that there are some people who disagree with the aging with which some scientists label various mountains and canyons, so let’s just settle on the fact that some of these places are very, very old.

There is only one place in the United States where a person can put his feet and hands in four different States at the same time, and that place is called The Four Corners. The story behind this incredible area deals with the formation of what is known as the Colorado Plateau. This area covers 130,000 square miles in Utah, Colorado, New Mexico, and Arizona. If you have ever been to any of Utah’s Mighty Five National Parks you are on the Colorado Plateau, but it’s much more than that. There are 3 national recreation areas, 10 national parks, and 16 national monuments all included in that amazing geologic formation.

Scientists say that millions of years ago tropical seas covered the Plateau region where layers of limestone, sandstone, silt and shale were continually deposited. When upheavals began to lift the plateau, and mountain-building events occurred, volcanic eruptions also accented the western area. Eras of various rivers, lakes, and inland seas continued to leave sediment deposits known as the Chinle, Moenave and Kayenta layers. Later, a huge desert formed the Navajo, Temple-Cap and Carmel formations.

Tectonic activity began to uplift the Plateau nearly two miles high and slightly tilt it to the west. Rivers and streams responded with increased downcutting and erosion which revealed scenic wonders from narrow slot-canyons to huge cuts in the earth’s surface. Perhaps you have heard the term “Grand Staircase” which describes the descent in altitude from Bryce Canyon down to Zion Canyon and further down to the Grand Canyon in Arizona. About ninety percent of the area is drained by just a few rivers including the Colorado, Green, San Juan, Little Colorado and the Rio Grand.

Why emphasize the geology? Besides climate, think how the soil and rock formations determine water retention and flow directions. How water and soil then determines the plant life in an area. And finally, how all three of those components determine what wildlife will exist in that same area.

So the next time you visit Utah’s Mighty Five: Arches, Bryce Canyon. Canyonlands, Capitol Reef, or Zion Canyon, try to picture yourself atop a huge natural table-top with incomparable scenery.

This is Ron Hellstern, and I am Wild About Utah.

Credits:

Images: Courtesy & Copyright
Audio: Courtesy and Copyright Kevin Colver
Text: Ron Hellstern, Cache Valley Wildlife Association

Additional Reading

Colorado Plateaus Province, Physiographic Provinces, National Park Service, https://www.nps.gov/articles/coloradoplateaus.htm

Geologic Provinces of the United States: Colorado Plateau Province, USGS Geology in the Parks, USGS, https://archive.usgs.gov/archive/sites/geomaps.wr.usgs.gov/parks/province/coloplat.html

Annerino, John, Colorado Plateau Wild and Beautiful, Farcounty Press, April 1, 2014, https://www.amazon.com/Colorado-Plateau-Wild-Beautiful-Annerino/dp/156037585X