Jalama Fm. (UCLA 4147) (Cretaceous of the United States)

Where: Santa Barbara County, California (34.6° N, 120.1° W: paleocoordinates 40.6° N, 90.2° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: III Member (Jalama Formation), Late/Upper Campanian (83.5 - 70.6 Ma)

• scale of strat. resolution may be couple of beds. JA: the Jalama Formation is lower upper Campanian according to Squires and Saul 2003

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, brown sandstone and gray, sandy shale

• "120-175' thick. Dark brown, arkosic sandstone, interbedded with gray sandy shale."

Collection methods: mechanical,

Primary reference: D. H. Dailey and W. P. Popenoe. 1966. Mollusca from the upper Cretaceous Jalama Formation, Santa Barbara County, California. University of California Publications in Geological Sciences 65:1-41 [J. Alroy/M. Sommers/A. Clement]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 1552: authorized by John Alroy, entered by Mike Sommers on 13.05.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• Abundances: R (rare) 1-2 specs., U (uncommon) 3-10 specs., C (common) 11-25 specs., A (abundant) 26+ specs.
Bivalvia
 Arcida - Glycymerididae
 Cardiida - Corbiculidae
 Cardiida - Arcticidae
 Cardiida - Mactridae
Cymbophora ? gabbiana Anderson 1902 clam
originally entered as "Cymbophora ? gabbiana"
 Cardiida - Veneridae
Legumen ooides Gabb 1864 venus clam
Calva varians venus clam
 Trigoniida - Trigoniidae
Trigonia evansana Meek 1864 clam
Gastropoda
 Architaenioglossa - Ampullinidae
 Stromboidea - Aporrhaidae
 Calyptraeoidea - Trichotropidae
Lysis duplicosta Gabb 1864 snail
 Sorbeoconcha - Potamididae
? Terebralia juliana horn snail
originally entered as "? Terebralia juliana"
 Sorbeoconcha -
"? Pseudoglauconia ainiktos" = Bullamirifica ainiktos
"? Pseudoglauconia ainiktos" = Bullamirifica ainiktos Dailey and Popenoe 1966 snail
originally entered as "? Pseudoglauconia ainiktos"
 Tectibranchia - Scaphandridae
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell