Univ. Cal. Loc. 3207 - Pleito Fm (Oligocene of the United States)

Where: Kern County, California (35.0° N, 119.2° W: paleocoordinates 33.4° N, 109.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pleito Formation (San Lorenzo Group), Early/Lower Oligocene (33.9 - 28.4 Ma)

• STRATIGRAPHIC RELATIONS: From Pleito Fm of the San Lorenzo Group, which unconformably overlies the San Emigdio Fm (Late Eocene), and is unconformably overlain by the Pleito Fm (Early Oligocene) of the San Lorenzo Group. THICKNESS: From bed within unit of formation that reaches 600 ft in thicknes. AGE: Late Eocene on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: From middle unit of the formation.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, shelly/skeletal, brown, gray, blue, conglomeratic sandstone and lithified, fine-grained, shelly/skeletal sandstone

• ENVIRONMENT: Presumably shallow marine, siliciclastic assemblage.
• SPECIFIC LITHOLOGY: Massive dark brown and buff sandstones with fossiliferous layers and light bluish gray massive conglomerates towards base. LITHIFICATION: Presumably lithified on the basis of age.

Size class: macrofossils

Reposited in the UCMP

Collection methods: surface (in situ),

• COLLECTOR: Presumably C. M. Wagner and K. H. Schilling (1917). REPOSITORY: Univeristy of California Collections of Invertebrate Paleontology, presumably UCMP.

Primary reference: C. M. Wagner and K. H. Schilling. 1923. The San Lorenzo Group of the San Emigdio region, California. University of California Publications, Bulletin of the Department of Geological Sciences 14(6):235-276 [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 71195: authorized by Austin Hendy, entered by Austin Hendy on 20.04.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropoda, bivalvia, scaphopoda, and cirripedia. NOMENCLATURE: Antiquated nomenclature, but an authoritative publication with species-level assignments.
Gastropoda
 Neogastropoda - Olividae
Ancilla fishii Gabb 1866 olive snail
 Neogastropoda - Siphonaliidae
"Agasoma gravida" = Bruclarkia gravida
"Agasoma gravida" = Bruclarkia gravida Gabb 1866 snail
 Sorbeoconcha - Naticidae
Natica recluziana Deshayes 1839 moon snail
Bivalvia
 Nuculanida - Sareptidae
"Yoldia cooperii" = Yoldia (Portlandia) cooperii
"Yoldia cooperii" = Yoldia (Portlandia) cooperii Gabb 1865 clam
 Nuculida - Nuculidae
"Acila shumardi" = Acila (Truncacila) shumardi
"Acila shumardi" = Acila (Truncacila) shumardi Dall 1909 divaricate nutclam
 Mytilida - Mytilidae
"Mytilus arnoldi" = Mytilus (Mytilus) arnoldi, "Mytilus mathewsonii" = Crenomytilus mathewsoni
"Mytilus arnoldi" = Mytilus (Mytilus) arnoldi Clark 1918 mussel
"Mytilus mathewsonii" = Crenomytilus mathewsoni Gabb 1866 mussel
 Arcida - Arcidae
Arca sp. Linnaeus 1758 ark
 Cardiida - Mactridae
"Spisula ramonensis" = Mactromeris ramonensis
"Spisula ramonensis" = Mactromeris ramonensis Packard 1916 clam
 Cardiida - Veneridae
Antigona undosa Clark 1918 venus clam
"Dosinia mathewsonii" = Dosinia (Dosinia) whitneyi Gabb 1866 venus clam
 Cardiida - Tellinidae
Macoma cf. nasuta Conrad 1837 tellin clam