Where: Millard County, Utah (39.5° N, 112.9° W: paleocoordinates 4.8° S, 92.1° W)

• local area-level geographic resolution

When: Ehmaniella zone, Swasey Limestone Formation, Delamaran (511.2 - 506.5 Ma)

• 70 meter thick formation at this locality, but fauna located in the upermost 1-3 meters. The depositional environments as interpretted from the stratigraphy is shifting deposition on a broad, low relief platform with ooid shoals seperating a quiet water lagoon from a shallow, open marine shelf to the west

• group of beds-level stratigraphic resolution

Environment/lithology: lithified lime mudstone and lithified grainstone

Collection methods: May represent a shell accumulation due to a sediment lag which was reworked and then lithified

Primary reference: R. A. Robison. 1999. Base of Ptychagnostus atabus Zone, candidate stratotype for base of unnamed international series. Laurentia 99: V field conference of the Cambrian Stage Subdivision Working Group, International Subcomission on Cambrian Stratigraphy 15-17 [M. Patzkowsky/P. Borkow]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 10565: authorized by Mark Patzkowsky, entered by Phil Borkow on 23.05.2001

Creative Commons license: CC BY (attribution)