Geology Archives - Page 7 of 16

April 11, 2016July 18, 2022

The Great Salt Lake

There is a giant among us with a profound influence on our past, present, and future. My first encounter with this giant was both buoyant and delightful as I floated in the brine on a lovely summer day. But I was oblivious to the Great Salt Lake’s immense value as an environmental, cultural, and economic resource.

Much of what follows is taken from a very recently released collaborative study titled “Impacts of Water Development on Great Salt Lake and the Wasatch Front” which was a collaborative effort from four institutions(Utah State University, Utah Division of Water Resources, Salt Lake Community College, and the Utah Division of Wildlife Resources.)

A 2012 analysis by Bioeconomics estimated the economic value of the lake at $1.32 billion per year for mineral extraction, brine shrimp cyst production, and recreation. The abundant food and wetlands of the lake attract 3 million shorebirds, as many as 1.7 million eared grebes, and hundreds of thousands of waterfowl during spring and fall migrations. Because of this, it has been designated as a Western Hemisphere Shorebird Reserve Network Site. Due to its enormous surface area, it produces the “lake affect” which enhances our snow pack by an estimated 8%, a significant amount for both skiers and our available water. But our giant is shrinking.

Since the arrival of 19th Century pioneers water diversions for irrigation have decreased its elevation by 11 feet exposing much of the lake bed. Natural fluctuations in rainfall and river flow cause the lake level to rise and fall, but there has been no significant long‐term change in precipitation and water supply from the main tributaries since their coming in 1847.

The Great Salt Lake Breach 2015 — The Great Salt Lake Breach
Credit: U.S. Geological Survey
Department of the Interior/USGS
Mike Freeman, Photographer
10 Nov 2015
For the first time since it was opened in 1984, water has stopped flowing through the Great Salt Lake causeway breach, an area that allows water to travel between the southern and northern parts of the lake.

To significantly reduce water use, a balanced conservation ethic needs to consider all uses, including agriculture, which consumes 63 percent of the water in the Great Salt Lake Basin. There are no water rights to protect our Great Lake, so water development currently focuses solely on whether there is water upstream to divert. If future water projects reduce the supply of water to the lake, (such as the Bear River Development Project, its level will (most likely) continue to drop.

We must look beyond the next few decades and decide how we value the lake for future generations. Lower lake levels will increase dust pollution and related human health impacts, and reduce industrial and environmental function of Great Salt Lake. We must be willing to make decisions now that preserve Great Salt Lake’s benefits and mitigate its negative impacts into the coming centuries.

John Muir, one of my favorite early American naturalists would most certainly agree with me. From his baptismal plunge into the Great Salt Lake. “I found myself undressed as someone else had taken me in hand and got myself into right lusty relationship with the brave old lake. I was conscious only of a joyous exhilaration….”
And where else could John and I have such a wonderfully buoyant experience?

This is Jack Greene reading for Wild About Utah.

2015 Great Salt Lake Breach at Lakeside, Utah — Gauge near the Great Salt Lake Breach
Credit: U.S. Geological Survey
Department of the Interior/USGS
Mike Freeman, Photographer
10 Nov 2015
A gauge to measure lake water levels stands dry in the lake bed of the Great Salt Lake. For the first time since it was opened in 1984, water has stopped flowing through the Great Salt Lake causeway breach, an area that allows water to travel between the southern and northern parts of the lake.

Credits:
Image: Courtesy U.S. Department of the Interior, U.S. Geological Survey(USGS), gallery.usgs.gov
Text: Jack Greene, Bridgerland Audubon Society & USU Office of Sustainability
Additional Reading:

Great Salt Lake, Utah, Stephens, Doyle W. and Gardner, Joe, USGS Science for a Changing World, https://pubs.usgs.gov/wri/wri994189/PDF/WRI99-4189.pdf

Salt Lake Brine Shrimp, https://saltlakebrineshrimp.com/harvest/

Great Salt Lake Footprint 2001 vs 2003 Comparison — Great Salt Lake Footprint Comparison
2001 vs 2003
Images Courtesy NASA
NASA’s Earth Observatory

January 4, 2016March 4, 2026

Utah’s Petroglyph Garden

Click to view Petroglyph Panel at the Fremont Indian State Park & Museum, Photo Courtesy Sevier County, Kreig Rasmussen, Photographer — Petroglyph Panel at Fremont Indian State Park & Museum
Photo Courtesy Sevier County
Kreig Rasmussen, Photographer

Hi, I’m Ru Mahoney with Stokes Nature Center in Logan Canyon.

Utah’s culture is rich with vestiges of our pioneer history, and the landscape is accented by visible signs of the European settlers who forged our modern communities. But the tapestry of Utah’s cultural heritage is interwoven with much older threads, as indelible and enduring as the landscape itself.

In the 1980’s, in the southwestern quadrant of central Utah, the construction of interstate 70 unearthed a secret over one thousand years old. The valleys and canyons of what is now Sevier County, already known as a seasonal thoroughfare for the Paiute, had an even older history as home to the largest community of Fremont Indians ever discovered. Influenced by their Anasazi cousins to the southwest, the Fremont culture encompassed a diverse group of tribes that inhabited the western Colorado Plateau and the Great Basin area from roughly 400 to 1350 A.D. Archaeologists tell us they were a people of ingenuity in their engineering, aggression in their social interactions, and lasting creativity in their artistic expression. Divergent theories on their fate suggest they drove the Anasazi out of the Four Corners region and eventually migrated to further landscapes, or that northern groups of Fremont peoples joined with bands of Shoshone and became the Ute Indians of the Uinta. Whatever the truth of their ultimate fate may be, nowhere is their history more tangible than at Fremont Indian State Park just south of Sevier, UT along I-70. This year-round state park offers visitors a treasure trove of artifacts and curated exhibits in an excellent visitor’s center. But the most authentic interaction with these past peoples comes from exploring the surrounding landscape.

Driving the winding road into Clear Creek Canyon, ghostly figures begin to emerge; pictographs painted in shades of ocher and umber, and pale petroglyphs carved into the canyon walls, reveal an archaic and epic account of Utah’s ancestral past. A unique creation story, in which a shrike leads the Fremont people from a dark and cold underworld through the stem of reed into the warm world above, plays out across the canyon walls. A craggy outcrop of rock in the shape of an eagle is said to be watching over the reed to the underworld below to insure nothing wicked escapes into our world. A concentric lunar calendar and an abundance of zoomorphics speak of a cultural identity conceived in relation to the broader astrological world, and a reverence for anthropomorphized neighbors such as bighorn sheep and elk. Spider Woman Rock juxtaposes a powerful figure of Native American mythology with the pedestrian humility of a nursing mother. And Cave of 100 Hands is a visceral exhibition of a humanity simultaneously reminiscent and divergent from our own.

While the Fremont culture is believed to have died out or been absorbed by other modern groups, Clear Creek Canyon and the rock art sites of Fremont Indian State Park are significant among the modern Kanosh and Koosharem Bands of the Paiute who began using the area and leaving their own indelible marks on the canyon walls after the disappearance of the Fremont peoples around 1400 A.D. On the vernal and autumnal equinox (occurring in the third or fourth week of March and September each year) the eagle rock casts its shadow over the reed rock at dawn, breathing life into ancient tales of our ancestral history.

Fremont Indian State Park is a notable destination for those interested in rock art sites, many of which are suited to families of all ages and mobility, including visitors with strollers and wheelchairs. Stop in the visitor’s center to borrow or purchase a guide to the petroglyphs and pictographs for deeper insight into the Fremont culture and an unforgettable glimpse into Utah’s past.

For Wild About Utah and Stokes Nature Center, I’m Ru Mahoney.

Credits:
Images: Courtesy Sevier County, Kreig Rasmussen, Photographer
Text: Ru Mahoney, Stokes Nature Center in Logan Canyon.

Additional Reading:

https://stateparks.utah.gov/parks/fremont-indian/

https://stateparks.utah.gov/stateparks/wp-content/uploads/sites/26/2015/02/Fremont_IndianBrochure.pdf

https://www.nps.gov/grba/learn/historyculture/fremont-indians.htm

https://www.thefurtrapper.com/fremont_indians.htm

Take the Pledge to Protect the Past, Utah State Historical Preservation Office, Department of Cultural & Community Engagement, State of Utah, https://ushpo.utah.gov/shpo/upan/

November 30, 2015March 4, 2026

A Safari through Utah’s Ice Age

Click to view larger image of a ground sloth of the Pleistocene, Photo Courtesy Paramylodon harlani, Texas Memorial Museum, University of Texas at Austin. Via Wikimedia,as licensed through Creative Commons Attribution-Share Alike 3.0 Unported — Wave-cut platforms from
Lake Bonneville preserved on
Antelope Island, Great Salt Lake, Utah.
Photo Courtesy Wikimedia, Mark A. Wilson (Department of Geology, The College of Wooster), Photographer

Ground sloth of the Pleistocene
*Paramylodon harlani*
Texas Memorial Museum
University of Texas at Austin.
Photo Courtesy Wikimedia
Licensed CCA Share Alike 3.0 Unported

Lake Bonneville compared to the
State of Utah.
Photo Courtesy https://wildlife.utah.gov/gsl/history/

Hi, I’m Ru Mahoney with Stokes Nature Center in Logan Canyon. As winter approaches I find myself anticipating the first really good snow, when our valley floors and mountain passes will be transformed overnight, relinquishing autumn’s riot of color for a glacial monochrome. As little as 12,000 years ago winter white was Utah’s perennial favorite, donned at the launch of the Pleistocene Epoch, a roughly 2 million year long period (give or take 10,000 years) marked by widely recurring glaciations.

The west has a reputation for being vast, but Ice Age Utah was even bigger. The mountains where higher and sharper. And the Great Salt Lake was submerged beneath the glacial waters of Lake Bonneville. At its largest, this massive body of water covered 20,000 square miles and was more than 980 feet deep. To put that into perspective, that measures about 9.5 million football fields wide by 4.5 Salt Lake Temples deep. And the Ice Age wildlife? Well it was much more akin to an African safari than anything you’re likely to find on your favorite shoreline trail these days.

The megafauna of Pleistocene Utah included a menagerie of beasts that are the stuff of legend. Familiar species like bison and big-horn sheep grazed among herds of mammoths and mastodons. Camels and horses – destined for extinction in North America – were the prehistoric prey of dire wolves and saber-toothed cats. Giant ground sloths the size of modern day elephants stood on two powerful hind legs to browse on shoreline foliage. And herds of muskoxen kept a wary eye on Arctodus, the Short-faced bear, a formidable predator more than 50% larger than any bear species living today.

The last 30,000 years of Utah’s Ice Age were characterized by increasingly volatile shifts in climate. The changing norms in temperature and abundance of liquid water created cyclical periods of transitioning habitat. Forests and forest dwellers gave way to deserts and their specialist species, before shifting back to forests again, all in mere millennia. While nomadic and highly adaptable species like muskoxen eventually moved north to more stable climates, the less adaptable fauna of the Ice Age were increasingly relegated to sharing shoreline habitat diminished by the swollen banks of Lake Bonneville.

As fluctuating glaciers pushed southward and then retreated, canyons like Big and Little Cottonwood were gouged into existence. Spring and summer glacier melt carried an abundance of freshwater into the lake, sometimes sweeping along with it the remains of prehistoric animals that had not lasted through the winter, laying them to rest in shoreline deltas where their fossilized remains are now uncovered and studied in alluvial sediment. For many of Utah’s Ice Age animals, the end of the Pleistocene brought extinction.

Today the ancient shoreline of Lake Bonneville is one of the most distinguishable geological features along the Wasatch front. This “bench”, as it’s now commonly known, is easily identifiable in cities all along the Wasatch and frequently boasts fine homes and even finer views. Which might go to show that lakeside property retains its value whether the lake is still there or not. So as you enjoy a winter hike or cross country ski along a shoreline trail this season, think about Utah’s last Ice Age and how our rich fossil record, with some of earth’s largest land mammals, paints a picture of an even wilder west.

For Wild About Utah and Stokes Nature Center, I’m Ru Mahoney.

A Safari through Utah’s Ice Age-Credits:
Image1: Courtesy Wikimedia, Mark A. Wilson (Department of Geology, The College of Wooster), Photographer
Image2: Courtesy Wikimedia,as licensed through Creative Commons Attribution-Share Alike 3.0 Unported
Image3: Courtesy https://wildlife.utah.gov/gsl/history/
Text: Ru Mahoney, Stokes Nature Center in Logan Canyon.

A Safari through Utah’s Ice Age-Additional Reading:
https://geology.utah.gov/popular/general-geology/ice-age/ice-age-animals-of-utah/

https://serc.carleton.edu/vignettes/collection/37942.html

https://hugefloods.com/Bonneville.html

https://geology.utah.gov/surveynotes/archives/snt42-3.pdf

https://geology.utah.gov/surveynotes/articles/pdf/pleistocene_fossils_42-3.pdf

November 2, 2015March 4, 2026

An Arizona Road Trip Back Into the Past

Montezuma Castle, Courtesy US NPS — Montezuma Castle
Courtesy US NPS

Location of Hubbell Trading Post NHS in the Southern Colorado Plateau Network
https://science.nature.nps.gov/im/units/scpn/parks/hutr.cfm/[Nov 2, 2015]
Courtesy US NPS

Hubbell Trading Post Interior
Courtesy US NPS

Location of Hubbell Trading Post NHS in the Southern Colorado Plateau Network, Courtesy US NPS — Montezuma Castle
Courtesy US NPS

Location of Hubbell Trading Post NHS in the Southern Colorado Plateau Network
https://science.nature.nps.gov/im/units/scpn/parks/hutr.cfm/[Nov 2, 2015]
Courtesy US NPS

Hubbell Trading Post Interior
Courtesy US NPS

Arizona is rich in history — from the 1800s all the way back to the Late Triassic Period. You can stitch together a road trip that winds out of Flagstaff to Montezuma Castle National Monument, to Petrified Forest National Park, and ends at Hubbell Trading Post National Historic Site. Along the way you’ll experience fascinating chapters of geologic and cultural history.

At Montezuma Castle, 45 minutes south of Flagstaff and just off Interstate 17 (Exit 289), a short walk places you in front of a 5-story-tall cliff dwelling that offered safety from invaders: it stands 100 feet above the valley floor, nestled into an alcove.

The site was misnamed Montezuma Castle in the late 1800s by whites who thought the structure had been built by the Aztec people. The original owners, members of the Southern Sinagua (seen aug wah) people, called this area home from roughly 1100-1425 A.D.

Stroll the short trail that loops around a vegetated landscape below the “castle,” and you’ll find great views as well of the remains of Castle A. That dwelling once rose 60 feet and was home to about 100 residents.

From Montezuma’s Castle, it’s 95 miles via Arizona 87 to Winslow, and then 34 miles east on Interstate 40 to Holbrook. Finally, another 19 miles southeast on Arizona 180 leads you into Petrified Forest National Park and its unusual landscape.

There’s no lodging within the park, and you have to leave by sundown, so you will need to make some tough decisions if you have just one day. Do you take time to tour the Rainbow Forest Museum with its dinosaur displays, or hike out to Agate House?

A building built of petrified wood is pretty cool, so stretch your legs with a walk to the house. Then head north and deeper into the park to the Crystal Forest Trail. Wander this path and you’ll find yourself surrounded by petrified wood with its hues of yellow, red, and green, black and white.

Blue Mesa is another great stop. There’s a trail that takes you down into another colorful landscape of badlands and chunks, logs, and even slabs of petrified wood in shades of red, blue, yellow and black.

The northern end of the park road is anchored by the Painted Desert, a great place for sunset photos. Here you’ll also see the Painted Desert Inn, which some day could put the Park Service back into the lodging business but today is just a museum piece.

Back on Interstate 40, drive 22 miles east to Chambers, and then north on U.S. 191 for about 38 miles to Ganado and Hubbell Trading Post. This authentic trading post was opened by John Lorenzo Hubbell in 1878 on the Navajo Reservation.

Although it was added to the National Park System in 1967, Hubbell is not a museum piece but an active trading post. As such, it still holds richly woven Navajo rugs, jewelry, and other Native American artworks for purchase.

Schedule your visit to Hubbell Trading Post for May and you just might be able to attend the annual Native American Art Auction. Check with the park (928-755-3475) for the exact date.

If you have a little more free time, you could extend your your trip by heading 39 miles north on 191 to Canyon de Chelly National Monument.

For Wild About Utah and National Parks Traveler, I’m Kurt Repanshek.

Credits:
Image: Courtesy and Copyright Kurt Repanshek, www.nationalparkstraveler.com
Text: Kurt Repanshek, NationalParksTraveler.com.

Additional Reading:

Montezuma Castle National Monument, NationalParksTraveler.com, https://www.nationalparkstraveler.com/2012/03/visiting-montezuma-castle-national-monument-arizona9636

Montezuma Castle National Monument, US National Park Service, https://www.nps.gov/moca/index.htm

Geographic Area covered by the State of Deseret and Utah Territory, International Society Daughters of Utah Pioneers, https://www.dupinternational.org/dyn_page.php?pageID=54