UCMP loc. 3156, Deer Valley (Eocene of the United States)

Where: Contra Costa County, California (37.9° N, 121.8° W)

• Paleocoordinates: 45.6° N, 94.3° W (Wright 2013)

• 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

• Shallow marine coastal siliciclastic environment
• Fine, micaceous sandstone, commonly with small pebbles, thinly beeded near bottom, more massive at top, yellow-brown to gray in color. The massive sandstones near top contain lenses of harded calcareous and fossiliferous sandstones.

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 52423: authorized by Austin Hendy, entered by Austin Hendy on 05.08.2005, edited by Jonathan Marcot

Creative Commons license: CC0 (CC0)

Taxonomic list

• Identified by Clark and Stewart.
Show authors, comments, and common names
Gastropoda
 Sorbeoconcha - Ficidae
Ficopsis meganosensis n. sp.
Ficopsis meganosensis n. sp. Clark and Woodford 1927 fig shell
 Neogastropoda - Buccinidae
Brachysphingus mammilatus
Brachysphingus mammilatus Clark and Woodford 1927 true whelk
 Neogastropoda - Fasciolariidae
Bulbifusus californicus n. sp.
Bulbifusus californicus n. sp. Clark and Woodford 1927 snail
 Sorbeoconcha - Naticidae
Polinices (Euspira) nuciformis
Polinices (Euspira) nuciformis Gabb 1864 moon snail
 Cerithioidea - Turritellidae
Turritella meganosensis n. sp., Turritella merriami1
Turritella meganosensis n. sp. Clark and Woodford 1927 turret shell
Turritella merriami1 Dickerson 1913 turret shell
as Turritella merriami subsp. brevitabulata
 Opisthobranchiata - Cylichnidae
"Scaphander cf. costatus" = Scaphander (Mirascapha) costatus
"Scaphander cf. costatus" = Scaphander (Mirascapha) costatus Gabb 1864 snail
Bivalvia
 Carditida - Crassatellidae
"Crassatellites meganosensis n. sp." = Crassatella meganosensis
"Crassatellites meganosensis n. sp." = Crassatella meganosensis Clark and Woodford 1927 clam
 Cardiida - Veneridae
"Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis
"Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis Clark and Woodford 1927 venus clam
 Cardiida - Mactridae
"Spisula meganosensis n. sp." = Pseudocardium meganosensis
"Spisula meganosensis n. sp." = Pseudocardium meganosensis Clark and Woodford 1927 clam
 Cardiida - Psammobiidae
Gari (Gobraeus) sp.2
Gari (Gobraeus) sp.2 Brown 1844 clam
 Cardiida - Cardiidae
"Cardium (Protocardium) marysvillensis" = Nemocardium (Nemocardium) linteum
"Cardium (Protocardium) marysvillensis" = Nemocardium (Nemocardium) linteum Conrad 1855 cockle
 Mytilida - Mytilidae
"Modiolus (Brachydontes) ornatus" = Brachidontes (Brachidontes) cowlitzensis
"Modiolus (Brachydontes) ornatus" = Brachidontes (Brachidontes) cowlitzensis Weaver and Van Winkle Palmer 1922 mussel
 Arcida - Glycymerididae
"Glycymeris major" = Glycymerita major
"Glycymeris major" = Glycymerita major Stanton 1896 clam
Subspecies: Glycymeris major meganosensis
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium cooperi
Dentalium cooperi Gabb 1864 tusk shell
1Merriam 1941; 2Moore 2003