USNM 18138 (Ordovician of the United States)

Where: California (41.4° N, 122.8° W: paleocoordinates 1.4° S, 74.6° W)

• outcrop-level geographic resolution

When: Kangaroo Creek Formation, Ashgill (449.5 - 443.7 Ma)

• bed-level stratigraphic resolution

Environment/lithology: lithified limestone

• Massive Limestone.

Size class: macrofossils

Preservation: replaced with silica

Reposited in the USNM

Collection methods: bulk, hydrochloric

Primary reference: D. M. Rohr. 1980. Ordovician - Devonian Gastropoda from the Klamath Mountains, California. Palaeontographica Abteilung A 171:141-199 [P. Wagner/P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 69236: authorized by Pete Wagner, entered by Pete Wagner on 21.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

 Trochonematoidea - Lophospiridae
"Gyronema aff. historicum" = Proturritella historicum
"Gyronema aff. historicum" = Proturritella historicum Hudson 1905 snail