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
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
Scaphopoda | |
Dentalium (Entalis) whiteavesi Anderson and Hanna 1935 tusk shell | |
Cephalopoda | |
Hauericeras sp., "Desmophyllites aff. siskiyouensis" = Desmophyllites diphylloides
Hauericeras sp. de Grossouvre 1894 ammonite
"Desmophyllites aff. siskiyouensis" = Desmophyllites diphylloides Forbes 1846 ammonite | |
Canadoceras sp. Spath 1922 ammonite | |
"Oxybeloceras petrolense" = Pseudoxybeloceras petrolense
"Oxybeloceras petrolense" = Pseudoxybeloceras petrolense Anderson 1958 ammonite | |
Baculites inornatus Meek 1862 ammonite
Baculites chicoensis Trask 1856 ammonite | |
Gastropoda | |
Pseudomelania colusaensis Anderson 1958 snail | |
"Cypraea aff. kayei" = Bernaya (Protocypraea) kayei
"Cypraea aff. kayei" = Bernaya (Protocypraea) kayei Forbes 1846 cowry | |
"Volutoderma californica" = Volutoderma averillii
"Volutoderma californica" = Volutoderma averillii Gabb 1864 volute | |
Tessarolax distorta Gabb 1864 snail | |
"Oligoptycha obliqua" = Biplica obliqua
"Oligoptycha obliqua" = Biplica obliqua Gabb 1864 snail | |
Bivalvia | |
Inoceramus aff. whitneyi Gabb 1869 clam
Inoceramus aff. chicoensis Anderson 1958 clam | |
"Parallelodon brewerianus" = Nanonavis breweriana
"Parallelodon brewerianus" = Nanonavis breweriana Gabb 1864 clam | |
"Glycymeris veatchii" = Glycymerita veatchii
"Glycymeris veatchii" = Glycymerita veatchii Gabb 1864 clam |