Riverdale (Paleocene of the United States)
Also known as L1, L5507, L6200
Where: McLean County, North Dakota (47.5° N, 101.2° W)
• Paleocoordinates: 54.2° N, 65.9° W (Wright 2013)
• coordinate based on political unit
When: Sentinel Butte Formation, Tiffanian (61.7 - 56.8 Ma)
Environment/lithology: terrestrial
Primary reference: R. C. Holtzman. 1978. Late Paleocene Mammals of the Tongue River Formation, Western North Dakota. North Dakota Geological Survey Report of Investigations 65:1-88 [J. Alroy/J. Alroy/M. Uhen]more details
PaleoDB collection 14977: authorized by John Alroy, entered by John Alroy on 18.02.1993
Creative Commons license: CC0 (CC0)
Taxonomic list
• original locality is L1, others are newly discovered: Hartman et al. 1993
either Tongue River Fm. or Sentinel Butte Fm. according to Holtzman, but 23.2 m above base of Sentinel Butte Fm. according to Hartman and Kihm 1991
diverse molluscs listed by Hartman et al. 1993
either Tongue River Fm. or Sentinel Butte Fm. according to Holtzman, but 23.2 m above base of Sentinel Butte Fm. according to Hartman and Kihm 1991
diverse molluscs listed by Hartman et al. 1993
Show authors, comments, and common names
| Mammalia | |
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Arctocyonidae indet. Murray 1866 condylarth | |
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Titanoides primaevus Gidley 1917 pantodont | |
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Ptilodus kummae Krause 1977 multituberculate | |