Also known as R-280c and R-305

Where: Weber County, Utah (41.3° N, 111.7° W)

• Paleocoordinates: 30.7° N, 130.0° W (Wright 2013)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Ptychagnostus gibbus trilobite zone, Blacksmith Formation, Amgan (510.2 - 504.5 Ma)

• Topazan. 30.5 m above the base of the P. gibbus Zone & also 30.5 m above the top of a carbonate unit with capping lenses of bioclastic limestone that contain a distinctive "Glyphaspis fauna,"

• bed-level stratigraphic resolution

Environment/lithology: brown, gray claystone and bentonitic limestone

Size class: macrofossils

Primary reference: R. A. Robison. 1978. Origin, taxonomy, and homeomorphs of Doryagnostus (Cambrian Trilobita). University of Kansas Paleontological Contributions 91:1-10 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 225065: authorized by Pete Wagner, entered by Pete Wagner on 21.04.2022

Creative Commons license: CC0 (CC0)