Category: Paleobiology

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A Safari through Utah’s Ice Age

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.

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.


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

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Echoes of Lake Bonneville

Echoes of Lake Bonneville: North Spring, Fish Springs National Wildlife Refuge, Utah. Courtesy Utah Geological Survey
North Spring, Fish Springs National Wildlife Refuge, Utah. Courtesy Utah Geological Survey

Leland Harris wetlands, Snake Valley, Utah, Courtesy Utah Geological SurveyLeland Harris wetlands
Snake Valley, Utah
Courtesy Utah Geological Survey

Least Chub, Courtesy and Copyright Mark C. Belk, PhotographerLeast Chub
Courtesy & © Mark C. Belk, Photographer
Echoes of Lake Bonneville

Hi, I’m Holly Strand of the Quinney College of Natural Resources at Utah State University.

Deserts are dry by definition receiving an average of less than 10 inches of precipitation a year. In Utah’s cold West Desert, this skimpy amount of moisture slakes the thirst of sagebrush, saltbush or greasewood, but not much else. However, just like the Sahara, the West Desert has its oases. In certain lowland valleys you’ll find complexes of pools and marshes. There isn’t enough rain to form these freshwater sanctuaries. The water comes from giant underground aquifers.

Underneath the West Desert, the aquifer system acts as a storehouse for runoff from the surrounding mountains. As rainwater or snow melt enters or “recharges” the aquifer system, water pressure can build up in some areas. This pressure moves water through cracks and tunnels within the aquifer, and sometimes this water flows out naturally in the form of springs.

These desert springs–and the resulting pools and marshes–permit concentrations of animals and plants not possible under normal desert conditions. You’ll find sedges, rushes cattails and many other wetland plants. Both migratory and year round birds congregate here. There are even a couple of frog species—the Colombian spotted frog and the northern leopard frog.

But most remarkable are the desert spring residents that have survived from the days when the West Desert formed the floor of giant Lake Bonneville. Surveys have revealed a number of relict snails and other mollusks that still persist from that time. Some, like the Black Canyon Pyrg exist at a single spring complex only; they are found nowhere else on earth.

Certain native fish were also left high and dry by Lake Bonneville’s recession. The least chub is a good example. Now the sole member of its genus, this 3-inch long survivor is an unassuming but attractive little minnow. It is olive-colored on top and sports a gold strip on its steel-blue sides. It swims in dense but orderly schools in either flowing or still water. It can withstand both temperature variations and high salinity. The ability to tolerate different physical conditions has undoubtedly helped the least chub survive the post-Lake Bonneville millennium. Even so, the least chub was hanging on in only six different locations until Utah’s Division of Wildlife Resources reintroduced it to several more sites within its historic range. The Division and its conservation partners are still working to reduce threats to the least chub, to other spring residents and to the spring habitats themselves.

For more information and pictures go to www.wildaboututah.org

Thanks to Chris Keleher of Utah’s Department of Natural Resources for his help in developing this Wild About Utah story.

For Wild About Utah, I’m Holly Strand.

Credits:

Theme: Courtesy & Copyright Don Anderson Leaping Lulu
Image: Least Chub, Mark C. Belk, Professor of Biology, Brigham Young University
Image: Wetlands, Courtesy Utah Geological Survey https://geology.utah.gov/
Text: Holly Strand, Quinney College of Natural Resources at Utah State University

Sources & Additional Reading

Bailey, Carmen L., Kristine W. Wilson Matthew E. Andersen. 2005. CONSERVATION AGREEMENT AND STRATEGY FOR LEAST CHUB (IOTICHTHYS PHLEGETHONTIS) IN THE STATE OF UTAH Publication Number 05-24 Utah Division of Wildlife Resources a division of Utah Department of Natural Resources https://wildlife.utah.gov/pdf/fish/least_chubs.pdf

Jones, Jennifer, Rich Emerson, and Toby Hooker. 2013. Characterizing Condition in At-risk
Wetlands of Western Utah: Phase I UTAH GEOLOGICAL SURVEY a division of Utah Department of Natural Resources,https://geodata.geology.utah.gov/pages/view.php?ref=8364

Nature Serve entry for Least Chub: https://explorer.natureserve.org/servlet/NatureServe?searchName=Iotichthys+phlegethontis

Hanks, Joseph H. and Mark C. Belk. 2004. Threatened fishes of the world: Iotichthys phlegethontis Cope, 1874 (Cyprinidae) in Environmental Biology of Fishes, Vol. 71. N. 4., Kluwer Academic Publishers. https://dx.doi.org/10.1007/s10641-004-1030-x

Sigler W. F. & J. W. Sigler. 1996. Fishes of Utah, A Natural History. University of Utah Press, Salt Lake City. 375 pp. https://www.amazon.com/Fishes-Utah-A-Natural-History/dp/0874804698

Wasatch Front Canyons Geologic Tour, Virtual Tour created from Published Booklet (pdf) Geologic Guide to the Central Wasatch Front Canyons, Utah Geological Survey, State of Utah, https://utahdnr.maps.arcgis.com/apps/MapTour/index.html?appid=5cf1570b998346d98478a5abd50bf096

Geologic guides to the central Wasatch Front Canyons, Utah Geological Survey, 2005, https://geology.utah.gov/popular/utah-landforms/virtual-tour-central-wasatch-front-canyons/ [updated January 2024]

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Bird Gizzards and the Old Grind

Chicken Gizzard
Chicken Gizzard
Copyright 2013 Jim Cane
Chicken GizzardNaturally polished dinosaur gastrolith found near Duschene Utah
Copyright Rick Dunne, Photographer

You may think of “the old grind” as your workweek, but from a dietary perspective, the old grind links your holiday turkey with dinosaurs. Before making gravy this Thanksgiving, find the densely muscular organ amid your turkey’s giblets. This is the turkey’s gizzard which preceded the living bird’s intestine. In its tough-walled gizzard, a bird mechanically breaks down hard or tough foodstuffs like we mammals use our molars. Reducing chunks to crumbs gives digestive enzymes the large surface areas needed to efficiently digest food.

Being toothless, birds must swallow most nuts, seeds, bugs and mollusks whole. In the gizzard, these items are churned, crushed and ground up, aided by ingested sand, grit or small stones called “gastroliths”. A turkey’s gizzard squeezes with twice the force of our own jaws. At 400 pounds per square inch, this force shatters acorns and even hickory nuts. The gizzard works like the ball mills used in mining, wherein heavy rotating iron drums loaded with steel balls pulverize rock ore. Like a gem tumbler, though, the gizzard eventually smooths and polishes its gastroliths. Having thus lost their utility, these stony gastroliths are regurgitated.

Gastroliths did not originate with birds, Continue reading “Bird Gizzards and the Old Grind”

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Utah at the Smithsonian

Utah at the Smithsonian: Click for a larger view of Diplodicus, Courtesy NMNH.si.edu, Michael Brett Surman, Photographer
Diplodicus
Courtesy NMNH.si.edu
Michael Brett Surman, Photographer

Utah at the Smithsonian: Camarasaurus, Camarasaurus lentus (Marsh), Courtesy https://www.nmnh.si.edu/, Michael Brett Surman, PhotographerCamarasaurus
Camarasaurus lentus (Marsh)
Courtesy NMNH.si.edu
Michael Brett Surman, Photographer

Utah at the Smithsonian: Smithsonian Butte, Public Domain, Courtesy National Scenic Byways Online, https://www.byways.org/ and Bureau of Land Management, John Smith, Photographer

Smithsonian Butte
Public Domain, Courtesy
National Scenic Byways Online and Bureau of Land Management.
John Smith, Photographer

Hi, I’m Holly Strand from the Quinney College of Natural Resources at Utah State University.

You don’t have to be in Utah to appreciate some of its treasures. Examples of Utah natural history can be found in museums around the globe. The last time I was in Washington DC, I explored the collections of the Smithsonian Museum of Natural History. There turned out to be a whole lot more Utah stuff than I ever imagined.

Many would consider dinosaurs to be our most illustrious museum export. Indeed a 90-foot long Utah diplodocus is the centerpiece of the museum’s Dinosaur Hall.

Not far away is an amazingly intact Camarasaurus from Utah’s Dinosaur National Monument. Its fossilized bones remained in position for over 150 million years. So beautifully and naturally preserved, it still rests on part of the sandstone block in which it was found.

Only a tiny fraction of the Museum’s collections are on display. The vast majority of its 126 million specimens are in drawers, vaults, and freezers. These items are meticulously cataloged and preserved and they serve as primary reference materials for researchers around the world. I found many 1000s of cataloged items for Utah plants, mammals and birds. Less abundant, there are still 100s of records representing specimens of our amphibians, reptiles and fish.

If you poke around in the collections databases you are sure to find something of interest. I found records of some 300 Utah plant specimens collected by Lester Frank Ward, a botanist who worked for John Wesley Powell on his western expeditions. Powell also contributed to the Smithsonian’s collection of flora and fauna. I found 8 bison skulls and one grass species, but there is probably more.

There is the skull and partial skeleton of a grizzly killed in Logan Canyon. Not Old Ephraim–his skull is here in Utah–but another one killed the year before.

In 1950, a meteorite struck a driveway just a few feet from a Box Elder County woman. A few years later, the meteorite was donated to the Smithsonian. But not before it was enhanced by local schoolchildren using crayons of various colors.

The museum’s mineral collection contains 1000s of Utah specimen, some with very strange names : I found Beaverite, Rabbitite Englishite, Coffinite, Psuedowavellite, Cristobalite, Alunite, Apatite and even Bieberite. As in Justin, I guess.

Anyway, you get the idea. The Smithsonian collections form the largest, most comprehensive natural history collection in the world. And Utah is a prime contributor of both collection items and the stories behind them.

By the way, not only are Utah things in the Smithsonian, but there are also Smithsonian things in Utah.

For example, the Henry Mountains in south central Utah were named after the first Secretary of the Smithsonian Institution Joseph Henry.

Another example is Smithsonite–or zinc carbonate–which was first identified by James Smithson in 1802. The very same Smithson left his fortune to the United States government, directing that it be used to create the Smithsonian Institution. The mineral Smithsonite has been found in Tooele and Washington Counties.

Lastly, there’s Smithsonian Butte. When the Powell Expedition traveled through the Zion area, geologist Edward Dutton named the Butte after the expedition’s most generous sponsor. Smithsonian Butte Road is a designated national backcountry byway, crossing over the Vermilion cliffs between Utah 9 and Utah 59.

For pictures, sources and links, go to www.Wildaboututah.org

For Wild About Utah, I’m Holly Strand.

Credits:

Images: Information and photos provided with the permission of the National Museum of Natural History, Smithsonian Institution, 10th and Constitution Ave. N.W., Washington, DC 20560-0193. (https://www.nmnh.si.edu/)
Smithsonian Butte, Public Domain, Courtesy National Scenic Byways Online and Bureau of Land Management., John Smith, Photographer
Text: Holly Strand

Sources & Additional Reading


Panoramic Virtual Tour of the Smithsonian National Museum of Natural History (NMNH). Navigate or go directly to the Dinosaur Hall to see the diplodocus from Utah. (Fossils: Dinosaur 2)
https://www.mnh.si.edu/panoramas/index.html

Dinosaur page of the NMNH.https://paleobiology.si.edu/dinosaurs/index.html

Research and Collections of the Smithsonian NMNH.
https://www.mnh.si.edu/rc/

Access to Smithsonian NMNH Museum Collection Records databases
https://collections.mnh.si.edu/search/

Smithsonite, Museum of Natural History, Smithsonian Institute, https://www.mnh.si.edu/onehundredyears/featured_objects/smithsonite.html