Imperial Formation (Pliocene of the United States)

Where: Imperial County, California (32.8° N, 116.0° W: paleocoordinates 32.6° N, 114.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Imperial Formation, Early/Lower Pliocene (5.3 - 3.6 Ma)

• STRATIGRAPHIC RELATIONS: From the Imperial Formation, for which lithostratigraphic relationships are not discussed; Carrizo Formation in text. AGE: Early Pliocene, based on existing (more recent) collections; Miocene and correlated Etchegoin Fm in text. STRATIGRAPHIC POSITION: Composite list for unspecified occurrences from the Imperial Formation at Coyote Mountain.

• formation-level stratigraphic resolution

Environment/lithology: marine; poorly lithified sandstone

• SPECIFIC LITHOLOGY: Fossil collections generally originate from sandstone layers. LITHIFICATION: Poorly lithified, on the basis of figured specimens.

Size class: macrofossils

Reposited in the UCMP

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

• COLLECTORS: Multiple collectors, including: W.S.W. Kew, W.W. English, and J.P. Buwalda, 1912. REPOSITORY: UCMP.

Primary reference: W. S. W. Kew. 1914. Tertiary echinoids of the Carrizo Creek region in the Colorado Desert. University of California Publications, Bulletin of the Department of Geology 8(5):39-60 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 155851: authorized by Austin Hendy, entered by Austin Hendy on 03.05.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to Spatangoida, but molluscs probably also present. NOMENCLATURE: Authoritative publication, with quite antiquated nomenclature, and species-resolution identifications.
Show authors, comments, and common names
Echinoidea
 Cidaroida - Cidaridae
Cidaris sp.
Cidaris sp. Leske 1778 pencil urchin