Forbes Shale - Petroleum Creek, Yolo (Cretaceous of the United States)

Where: Yolo County, California (39.0° N, 122.0° W: paleocoordinates 43.1° N, 86.4° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Forbes Formation (Asuncion Group), Coniacian (89.8 - 86.3 Ma)

• Forbes Shale consists of clay shale and silty or sandy shale, with a thickness of 1300 ft or more. From fossil bearing beds overlying the Dobbins horizon.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified shale

• No paleoenvironmental data reported.
• Shale.

Size class: macrofossils

Collection methods: quarrying,

• Collected by Bennison.

Primary reference: F. M. Anderson. 1958. Upper Cretaceous of the Pacific Coast. Geological Society of America Memoir 71:1-378 [A. Miller/A. Hendy/M. Clapham]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 44233: authorized by Austin Hendy, entered by Austin Hendy on 06.09.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Fairly exhaustive list.
Show authors, comments, and common names
Cephalopoda
 Ammonitida - Pachydiscidae
Canadoceras sp.
Canadoceras sp. Spath 1922 ammonite
 Ammonitida - Desmoceratidae
Hauericeras sp., "Desmophyllites aff. siskiyouensis" = Desmophyllites diphylloides
Hauericeras sp. de Grossouvre 1894 ammonite
"Desmophyllites aff. siskiyouensis" = Desmophyllites diphylloides Forbes 1846 ammonite
 Ammonitida - Diplomoceratidae
"Oxybeloceras petrolense" = Pseudoxybeloceras petrolense
"Oxybeloceras petrolense" = Pseudoxybeloceras petrolense Anderson 1958 ammonite
 Ammonitida - Baculitidae
Baculites chicoensis, Baculites inornatus
Baculites chicoensis Trask 1856 ammonite
Baculites inornatus Meek 1862 ammonite
Scaphopoda
  -
Dentalium (Entalis) whiteavesi
Dentalium (Entalis) whiteavesi Anderson and Hanna 1935 tusk shell
Gastropoda
 Heterostropha - Ringiculidae
"Oligoptycha obliqua" = Biplica obliqua
"Oligoptycha obliqua" = Biplica obliqua Gabb 1864 snail
 Pseudomelanoidea - Pseudomelaniidae
Pseudomelania colusaensis
Pseudomelania colusaensis Anderson 1958 snail
 Sorbeoconcha - Cypraeidae
"Cypraea aff. kayei" = Bernaya (Protocypraea) kayei
"Cypraea aff. kayei" = Bernaya (Protocypraea) kayei Forbes 1846 cowry
 Sorbeoconcha - Aporrhaidae
Tessarolax distorta
Tessarolax distorta Gabb 1864 snail
 Neogastropoda - Volutidae
"Volutoderma californica" = Volutoderma averillii
"Volutoderma californica" = Volutoderma averillii Gabb 1864 volute
Bivalvia
 Myalinida - Inoceramidae
Inoceramus aff. whitneyi, Inoceramus aff. chicoensis
Inoceramus aff. chicoensis Anderson 1958 clam
 Arcida - Glycymerididae
"Glycymeris veatchii" = Glycymerita veatchii
"Glycymeris veatchii" = Glycymerita veatchii Gabb 1864 clam
 Arcida - Parallelodontidae
"Parallelodon brewerianus" = Nanonavis breweriana
"Parallelodon brewerianus" = Nanonavis breweriana Gabb 1864 clam