Where: Sioux County, Nebraska (42.4° N, 103.8° W: paleocoordinates 43.3° N, 98.8° W)
• coordinate based on political unit
When: Marsland Formation (Hemingford Group), Harrisonian (24.8 - 18.5 Ma)
• = Upper Harrison beds
• bed-level stratigraphic resolution
Environment/lithology: terrestrial; lithology not reported
Size class: macrofossils
Primary reference: O. A. Peterson. 1907. The Miocene Beds of Western Nebraska and Eastern Wyoming and Their Vertebrate Faunae. Annals of Carnegie Museum 4(3):21-72 [J. Alroy/J. Alroy/J. Marcot]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 17809: authorized by John Alroy, entered by John Alroy on 18.02.1993
Creative Commons license: CC BY (attribution)
Taxonomic list
seems to be 6 to 7 mi SW of Harrison based on rough maps
"includes Peterson's (1907) stratotype Upper Harrison mammal assemblage": Hunt 1985a; Peterson's list for the Upper Harrison is therefore merged with Hunt's;
Yatkola 1978: Peterson's collections come from "a few miles east of Wyoming-Nebraska state line for 4 or 5 miles along the south side of the Niobrara River"
status of "Merychus medius" is unclear as identification is extremely tentative and is omitted from faunal list
| Mammalia | |
"Parahippus nebrascensis n. sp." = Desmatippus nebrascensis
"Parahippus nebrascensis n. sp." = Desmatippus nebrascensis Peterson 1907 anchitheriine horse | |
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Moropus hollandi n. sp.6
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Syndyoceras cooki5 Barbour 1905 protoceratid "Lower... Marsland, 4 miles south of Van Tassel, Sioux County, Nebraska"; based on location in Sioux County, direction is SE instead of S and this is on the Niobrara River in the Upper Harrison of Niobrara Canyon
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Oxydactylus longipes Peterson 1904 camel | |
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Merychyus minimus n. sp. Peterson 1907 oreodont | |
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"Aelurocyon brevifacies n. sp." = Megalictis simplicidens
"Aelurocyon brevifacies n. sp." = Megalictis simplicidens Peterson 1907 mustelid carnivore | |
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Cynarctoides acridens8 Barbour and Cook 1914 bone-crushing dog "9 mi southwest of Harrison, in high brown sand"
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