Where: Fremont County, Colorado (38.5° N, 105.3° W: paleocoordinates 14.4° S, 73.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Phragmodus undatus conodont zone, Harding Sandstone Formation, Franklinian (457.3 - 449.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: open shallow subtidal; sandstone

Size class: macrofossils

Reposited in the FMNH, USNM

Primary reference: I. J. Sansom, M. P. Smith, M. M. Smith and P. Turner. 1997. Astraspis, the anatomy and histology of an Ordovician fish. Palaeontology 40(3):625-643 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 155756: authorized by Pete Wagner, entered by Pete Wagner on 29.04.2014, edited by Barbara Seuss

Creative Commons license: CC BY (attribution)