Where: Contra Costa County, California (37.9° N, 121.7° W: paleocoordinates 40.5° N, 104.5° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Meganos Formation, Ypresian (56.0 - 47.8 Ma)
• "Meganos" faunas represent upper Bulitian and lower Penutian local ages=Ypresian
• bed-level stratigraphic resolution
Environment/lithology: coastal; lithified, fine-grained, pebbly, calcareous sandstone
Size class: macrofossils
Reposited in the UCMP
Collection methods: quarrying,
• Collected by Clark and Woodford. Collections reposited at UCMP.
Primary reference: B. L. Clark and A. O. Woodford. 1927. The geology and paleontology of the type section of the Meganos Formation (lower Middle Eocene) of California. University of California Publications in Geological Sciences 17(2):63-142 [A. Miller/A. Hendy/P. Wagner]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 52430: authorized by Austin Hendy, entered by Austin Hendy on 05.08.2005
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
"Modiolus (Brachydontes) ornatus" = Brachidontes (Brachidontes) cowlitzensis
"Modiolus (Brachydontes) ornatus" = Brachidontes (Brachidontes) cowlitzensis Weaver and Palmer 1922 mussel | |
"Arca hornii" = Pachecoa hornii
| |
Ostrea sp. Linnaeus 1758 oyster | |
? Sphenia meganosensis n. sp.
? Sphenia meganosensis n. sp. Clark and Woodford 1927 softshell clam | |
"Corbula dilatata" = Caryocorbula complicata
"Corbula dilatata" = Caryocorbula complicata Hanna 1924 clam | |
"Tellina longa" = Tellina (Angulus) longa
"Tellina longa" = Tellina (Angulus) longa Gabb 1864 tellin clam | |
"Diplodonta cretacea" = Diplodonta (Diplodonta) cretacea
"Diplodonta cretacea" = Diplodonta (Diplodonta) cretacea Gabb 1864 clam | |
Tivela kelloggensis Clark and Woodford 1927 venus clam | |
"Spisula meganosensis n. sp." = Pseudocardium meganosensis
"Spisula meganosensis n. sp." = Pseudocardium meganosensis Clark and Woodford 1927 clam | |
"Leda gabbi" = Nuculana (Saccella) gabbii
"Leda gabbi" = Nuculana (Saccella) gabbii Conrad 1866 pointed nut clam | |
Gastropoda | |
Odostomia diaboli Clark and Woodford 1927 snail
Turbonilla marshensis n. sp. Clark and Woodford 1927 snail | |
Polinices (Euspira) nuciformis Gabb 1864 moon snail | |
"Chrysodomus" martini Dickerson 1913 true whelk | |
Molopophorus californicus n. sp.
Molopophorus californicus n. sp. Clark and Woodford 1927 snail | |
Gemmula diabloensis n. sp.
Gemmula diabloensis n. sp. Clark and Woodford 1927 turrid | |
? Turricula cooperi Dickerson 1916 snail |