CAS 61938 - Ditch Creek Mbr, Hornbrook Fm (Cretaceous of the United States)

Where: Siskiyou County, California (41.7° N, 122.5° W: paleocoordinates 48.5° N, 88.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Ditch Creek Member (Hornbrook Formation), Coniacian (89.8 - 86.3 Ma)

• STRATIGRAPHIC RELATIONS: From Ditch Creek Member of the Hornbrook Formation. Further details published in Saul (1982) and Squires and Saul 2003, 2004). AGE: Cenomanian based on molluscan biostratigraphy. STRATIGRAPHIC POSITION: Unknown position within member.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified siltstone

• ENVIRONMENT: In general regarded as shallow water, though some units includes assemblages displaced into deeper waters through turbidity currents. Here assigned to a siliciclastic offshore environments on the basis of lithology.
• GENERAL LITHOLOGY: SIltstone, based on lithostratigraphic unit name "Ditch Creek Siltstone Mbr". LITHIFICATION: Assumed lithified based on lithologic description and figured specimens.

Size class: macrofossils

Preservation: original aragonite

Reposited in the CAS

• COLLECTOR: Unknown collected. REPOSITORY: CAS, California.

Primary reference: R. L. Squires and L. R. Saul. 2006. Additions and refinements to Aptian to Santonian (Cretaceous) Turritella (Mollusca: Gastropoda) from the Pacific Slope of North America. The Veliger 48(1):46-60 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 69612: authorized by Austin Hendy, entered by Austin Hendy on 28.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Only includes Turritella (Gastropoda), therefore very limited. NOMENCLATURE: Authoritative publication with species-level assignments.
Show authors, comments, and common names
Gastropoda
 Cerithioidea - Turritellidae
Turritella hearni
Turritella hearni Merriam 1941 turret shell