Univ. Cal. Loc. 3199 - 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 71187: 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
 Trochoidea - Trochidae
Calliostoma sp. Swainson 1840 top snail
 Neogastropoda - Muricidae
Thais packi Clark 1918 murex snail
 Neogastropoda - Buccinidae
"Siphonalia andersoni" = Siphonalia (Eosiphonalia) andersoni
"Siphonalia andersoni" = Siphonalia (Eosiphonalia) andersoni Wagner and Schilling 1923 true whelk
 Neogastropoda - Siphonaliidae
"Agasoma gravida" = Bruclarkia gravida
"Agasoma gravida" = Bruclarkia gravida Gabb 1866 snail
 Neogastropoda - Nassariidae
Molopophorus dalli Anderson and Martin 1914 snail
 Sorbeoconcha - Naticidae
Natica recluziana Deshayes 1839 moon snail
Bivalvia
 Nuculida - Nuculidae
"Acila shumardi" = Acila (Truncacila) shumardi
"Acila shumardi" = Acila (Truncacila) shumardi Dall 1909 divaricate nutclam
 Nuculanida - Sareptidae
"Yoldia cooperii" = Yoldia (Portlandia) cooperii
"Yoldia cooperii" = Yoldia (Portlandia) cooperii Gabb 1865 clam
 Hiatellida - Hiatellidae
"Panopea aff. estrellana" = Panopea abrupta
"Panopea aff. estrellana" = Panopea abrupta Conrad 1849 clam
 Cardiida - Veneridae
"Dosinia mathewsonii" = Dosinia (Dosinia) whitneyi, "Antigona mathewsonii" = Amiantis mathewsoni
"Dosinia mathewsonii" = Dosinia (Dosinia) whitneyi Gabb 1866 venus clam
"Antigona mathewsonii" = Amiantis mathewsoni Gabb 1866 venus clam
 Cardiida - Mactridae
"Spisula ramonensis" = Mactromeris ramonensis
"Spisula ramonensis" = Mactromeris ramonensis Packard 1916 clam
 Mytilida - Mytilidae
"Mytilus mathewsonii" = Crenomytilus mathewsoni
"Mytilus mathewsonii" = Crenomytilus mathewsoni Gabb 1866 mussel