Where: Nevada (40.3° N, 118.1° W: paleocoordinates 16.5° N, 37.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Permian (298.9 - 251.9 Ma)

• Specimen has dubious location data and essentially no age control. Even the provenance from the Rochester Volcanics is in doubt.

Environment/lithology: marine; lithified tuff and unlithified, tuffaceous shale

Size class: macrofossils

Collection methods: quarrying,

Primary reference: H. Wheeler. 1939. Helicoprion in the Anthracolithic (Late Paleozoic) of Nevada and California, and its stratigraphic significance. Journal of Paleontology 13(1):103-114 [M. Clapham/D. Robinson]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 118114: authorized by Matthew Clapham, entered by David Robinson on 06.10.2011

Creative Commons license: CC BY (attribution)