ammonites
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East of White Clay (Upper) (Miocene to of the United States)

Where: Shannon County, South Dakota (43.3° N, 102.5° W: paleocoordinates 43.7° N, 100.5° W)

• coordinate based on political unit

When: Ash Hollow Formation (Ogallala Group), Clarendonian to Clarendonian (13.6 - 10.3 Ma)

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: M. F. Skinner and F. W. Johnson. 1984. Tertiary stratigraphy and the Frick Collection of fossil vertebrates from north-central Nebraska. Bulletin of the American Museum of Natural History 178(3):1-368 [J. Alroy/J. Alroy/J. Alroy] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 18139: authorized by John Alroy, entered by John Alroy on 17.06.2000

Creative Commons license: CC BY (attribution)