Brock Mountain, 3 miles east of Madison's ranch (Pit shale) (Triassic of the United States)

Where: Shasta County, California (40.9° N, 122.1° W: paleocoordinates 11.4° N, 50.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pit Formation, Carnian (237.0 - 228.0 Ma)

• Pit shale, about 200 feet below the Hosselkus Limestone

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified shale

Size class: macrofossils

Preservation: mold/impression

Reposited in the USNM

Primary reference: J. P. Smith. 1927. Upper Triassic marine invertebrate faunas of North America. United States Geological Survey Professional Paper 141:1-262 [D. Bottjer/C. Powers/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 144374: authorized by Matthew Clapham, entered by Matthew Clapham on 06.05.2013, edited by Catherine Powers and Bethany Allen

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Ceratitida - Trachyceratidae
Trachyceras (Protrachyceras) storrsi n. sp. Smith 1927 ceratite
Bivalvia
 Ostreida - Halobiidae
Halobia rugosa Guembel 1861 oyster
 Pectinida - Limidae
Lima kimballi n. sp. Smith 1927 file clam
 Pectinida - Entoliidae
Pecten (Entolium) pittensis n. sp. Smith 1927 scallop
Echinoidea
 Cidaroida - Cidaridae
Cidaris sp. Leske 1778 pencil urchin
Crinoidea
 Isocrinida - Pentacrinitidae
Pentacrinus sp. Miller 1821 Sea lily