ammonites
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USGS D10511, Belle Fourche Reservoir, Butte (Cretaceous of the United States)

Where: Butte County, South Dakota (44.7° N, 103.7° W: paleocoordinates 44.1° N, 63.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Metoicoceras mosbyense ammonoid zone, Greenhorn Limestone Formation (Colorado Group), Late/Upper Cenomanian (99.7 - 94.3 Ma)

• Metoicoceras mosbyense zone

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, calcareous shale and lithified limestone

• fine silty, calcareous shales, interbedded with layers of flat, ovoid, red-orange weathering limestone concretions less than 30 cm in diameter

Size class: macrofossils

Reposited in the USNM

Primary reference: W. J. Kennedy, W. A. Cobban, and N. H. Landman. 1996. New records of acanthoceratid ammonoids from the Upper Cenomanian of South Dakota. American Museum Novitates 3161:1-18 [W. Kiessling/U. Merkel] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 178549: authorized by Matthew Clapham, entered by Matthew Clapham on 07.05.2016

Creative Commons license: CC BY (attribution)