Taylorsville [Hardgrave Sandstone] (Jurassic of the United States)

Where: Plumas County, California (40.1° N, 120.8° W)

• Paleocoordinates: 30.0° N, 44.7° W (Wright 2013)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Hardgrave Formation, Aalenian (174.1 - 170.3 Ma)

• LITHOSTRATIGRAPHY: From Hardgrave Sandstone in text; assigned to Hardgrave Formation, following GeoLex. AGE: earliest Middle Jurassic in text; assumed to belong to Aalenian. COMMENTS: Suspected to underly Mormon Sandstone, which is Bajocian.

Environment/lithology: marine; sandstone

• LITHOLOGY: not reported, but presumably a sandstone. LITHIFICATION: not reported.

Size class: macrofossils

Reposited in the USNM

Collection methods: surface (float), surface (in situ),

• COLLECTORS: unknown. REPOSITORY: unknown, but formally of Johns Hopkins University, and collections of USGS.

Primary reference: U. S. Grant and L. G. Hertlein. 1938. The West American Cenozoic Echinoidea. Publications of the University of California at Los Angeles in Mathematical and Physical Sciences 2:1-225 [L. Villier/L. Villier]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 156331: authorized by Austin Hendy, entered by Austin Hendy on 18.05.2014

Creative Commons license: CC0 (CC0)

Taxonomic list

• COVERAGE: Limited to echinodermata mentioned in text. NOMENCLATURE: Antiquated nomenclature, but with species-level identifications.
Show authors, comments, and common names
Echinoidea
 Cidaroida - Cidaridae
Cidaris taylorensis, Cidaris plumasensis n. sp.
Cidaris taylorensis Clark 1893 pencil urchin
Cidaris plumasensis n. sp. Clark and Twitchell 1915 pencil urchin