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Vol. 7 (2020): Geology of the Intermountain West

DOI: https://doi.org/10.31711/giw.v7

Published: 2020-03-18

Articles

Fallout tuffs in the Eocene Duchesne River Formation, northeastern Utah—ages, compositions, and likely source

Michael S. Jensen, Bart J. Kowallis, Eric H Christiansen, Casey A. Webb, Michael J. Dorais, Douglas A. Sprinkel, Brian Jicha

1-27
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An unusually diverse northern biota from the Morrison Formation (Upper Jurassic), Black Hills, Wyoming

John R. Foster, Darrin C. Pagnac, ReBecca K. Hunt-Foster

29-67
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Rhyolite ignimbrite boulders and cobbles in the Middle Jurassic Carmel Formation of Utah and Arizona—age, composition, transport, and stratigraphic setting

Bart J. Kowallis, Douglas Sprinkel, Eric H Christiansen, Skylor M. Steed, David F. Wheatley

69-96
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Hydraulic modeling and computational fluid dynamics of bone burial in a sandy river channel

Kenneth Carpenter

97-120
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Methane emissions from muds during low water-level stages of Lake Powell, southern Utah, USA

Margariete Malenda, Thomas A. Betts, Wendy S. Simpson, Michael C. Wizevich, Edward Simpson, Laura Sherrod

121-136
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The Morrison Formation and its bounding strata on the western side of the Blanding basin, San Juan County, Utah

James I. Kirkland, Donald D. DeBlieux, ReBecca K. Hunt-Foster, John R. Foster, Kelli Trujillo, Emily Finzel

137-195
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High-quality casts of the missing holotype of Petalodus ohioensis Safford 1853 (Chondrichthyes, Petalodontidae) at the Field Museum of Natural History and their bearing on the validity and priority of the species

Wayne M. Itano, Kenneth Carpenter

197-203
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Paleontology of Bears Ears National Monument (Utah, USA) History of exploration, study, and designation

Robert J. Gay, Adam K. Huttenlocker, Randall B. Irmis, M. Allison Stegner, Jessica Uglesich

205-241
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$Overturned boulder composed of a floodLeft: Cave breccia consisting of large, poorly sorted, white angular clasts of fractured limestone (or dolomite) surrounded by a yellowish altered matrix of feldspathic and granitic conglomerate and sandstone. Note also the greenish clay and black bitumen. Leadville Limestone, Big Flat No. 2 well, Grand County, Utah; slabbed core from 7630.5 feet (2325.8 m). Right: “Autobreccia” due to probable natural hydrofracturing showing a dolomite in which the “clasts” have moved very little; the black material surrounding the in-place clasts is composed of porous, late replacement dolomite coated with black bitumen. Leadville Limestone, Lisbon NW USA No. B-63 well, San Juan County, Utah; slabbed core from 9938.3 feet (3029.2 m).$

A tale of two breccia types in the Mississippian Leadville Limestone of Lisbon and other fields, Paradox Basin, southeastern Utah

Thomas C. Chidsey, Jr., David Eby, Douglas A. Sprinkel

243-280
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New social insect nests from the Upper Jurassic Morrison Formation of Utah

Elliott Armour Smith, Mark A. Loewen, James I. Kirkland

281-299
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G.K. Gilbert and the Bonneville shoreline

Charles G. Oviatt

300-320
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