PBDB Collection

UCMP loc. 3159, Deer Valley (Eocene of the United States)

Where: Contra Costa County, California (37.9° N, 121.8° W: paleocoordinates 40.6° N, 104.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Margaret Hamilton Sand Member (Meganos Formation), Ypresian (56.0 - 47.8 Ma)

• "Meganos" faunas represent upper Bulitian and lower Penutian local ages=Ypresian

•said to be, "Margaret Hamilton Sand [=division D of Meganos Formation as used by Clark and Woodford (1927)]" by Squires 1997

• 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 52426: authorized by Austin Hendy, entered by Austin Hendy on 05.08.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Identified by Clark and Stewart.

Show authors, comments, and common names

Scaphopoda
Dentaliida - Dentaliidae	Dentalium cooperi Dentalium cooperi Gabb 1864 tusk shell
Gastropoda
Cerithioidea - Turritellidae	Turritella meganosensis n. sp., Turritella merriami Turritella meganosensis n. sp. Clark and Woodford 1927 turret shell Turritella merriami Dickerson 1913 turret shell
Sorbeoconcha - Naticidae	Polinices (Euspira) nuciformis, Polinices (Euspira) gesteri, "Polinices (Euspira) hornii" = Polinices hornii Polinices (Euspira) nuciformis Gabb 1864 moon snail Polinices (Euspira) gesteri Dickerson 1916 moon snail "Polinices (Euspira) hornii" = Polinices hornii Gabb 1864 moon snail
Neogastropoda - Cancellariidae	"Admete (Bonellitia) cf. stantoni" = Bonellitia (Admetula) paucivaricata "Admete (Bonellitia) cf. stantoni" = Bonellitia (Admetula) paucivaricata Gabb 1864 snail
Neogastropoda - Fasciolariidae	Bulbifusus californicus Bulbifusus californicus Clark and Woodford 1927 snail
Neogastropoda - Buccinidae	"Siphonalia cf. sutterensis" = Siphonalia (Nassicola) sutterensis, ? Parvisipho meganosensis n. sp., Brachysphingus mammilatus "Siphonalia cf. sutterensis" = Siphonalia (Nassicola) sutterensis Dickerson 1913 true whelk ? Parvisipho meganosensis n. sp. Clark and Woodford 1927 true whelk Brachysphingus mammilatus Clark and Woodford 1927 true whelk
Neogastropoda - Nassariidae	Molopophorus californicus n. sp. Molopophorus californicus n. sp. Clark and Woodford 1927 snail
Neogastropoda - Clavatulidae	? Turricula cooperi ? Turricula cooperi Dickerson 1916 snail
Neogastropoda - Turridae	Gemmula wattsi Gemmula wattsi Anderson and Hanna 1925 turrid
Neogastropoda - Drilliidae	Drillia hartleyensis n. sp. Drillia hartleyensis n. sp. Clark and Woodford 1927 snail
Heterostropha - Acteonidae	Acteon sp. Acteon sp. Montfort 1810 snail
Trochoidea - Solariellidae	Solariella hartleyensis n. sp. Solariella hartleyensis n. sp. Clark and Woodford 1927 snail
Opisthobranchia - Cylichnidae	"Scaphander cf. costatus" = Scaphander (Mirascapha) costatus "Scaphander cf. costatus" = Scaphander (Mirascapha) costatus Gabb 1864 snail
Bivalvia
Nuculida - Nuculidae	Nucula (Acila) gabbiana Nucula (Acila) gabbiana Dickerson 1916 nut clam
Solenida - Solenidae	Solena (Eosolen) subverticala², "Solen cf. parallelus" = Solena (Plectosolen) parallelus Solena (Eosolen) subverticala² Vokes 1939 clam "Solen cf. parallelus" = Solena (Plectosolen) parallelus Gabb 1864 clam
Pholadida - Pholadidae	Martesia meganosensis n. sp. Martesia meganosensis n. sp. Clark and Woodford 1927 clam
Cardiida - Ungulinidae	"Diplodonta cretacea" = Diplodonta (Diplodonta) cretacea "Diplodonta cretacea" = Diplodonta (Diplodonta) cretacea Gabb 1864 clam
Cardiida - Veneridae	Dosiniopsis stewartvillensis n. sp., Pitar uvasana, "Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis, Pitaria californica, Pitaria conradi Dosiniopsis stewartvillensis n. sp. Clark and Woodford 1927 venus clam Pitar uvasana Conrad 1855 venus clam Subspecies: Pitaria uvasana marshallensis "Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis Clark and Woodford 1927 venus clam Pitaria californica Clark 1918 venus clam Subspecies: Pitaria californica stewartvillensis Pitaria conradi Dickerson 1916 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.¹ Gari (Gobraeus) sp.¹ Brown 1844 clam
Cardiida - Tellinidae	"Tellina longa" = Tellina (Angulus) longa, "Tellina joaquinensis" = Tellina (Angulus) joaquinensis "Tellina longa" = Tellina (Angulus) longa Gabb 1864 tellin clam "Tellina joaquinensis" = Tellina (Angulus) joaquinensis Arnold 1909 tellin clam
Cardiida - Cardiidae	"Cardium (Protocardium) marysvillensis" = Nemocardium (Nemocardium) linteum "Cardium (Protocardium) marysvillensis" = Nemocardium (Nemocardium) linteum Conrad 1855 cockle
Lucinida - Lucinidae	"Phacoides meganosensis n. sp." = Miltha (Miltha) meganosensis "Phacoides meganosensis n. sp." = Miltha (Miltha) meganosensis Clark and Woodford 1927 clam
Carditida - Crassatellidae	"Crassatellites meganosensis n. sp." = Crassatella meganosensis "Crassatellites meganosensis n. sp." = Crassatella meganosensis Clark and Woodford 1927 clam
Carditida - Carditidae	Venericardia hornii Venericardia hornii Gabb 1864 clam
Mytilida - Mytilidae	"Modiolus (Brachydontes) ornatus" = Brachidontes (Brachidontes) cowlitzensis "Modiolus (Brachydontes) ornatus" = Brachidontes (Brachidontes) cowlitzensis Weaver and Palmer 1922 mussel
Arcida - Arcidae	"Arca hornii" = Pachecoa hornii "Arca hornii" = Pachecoa hornii Gabb 1864 clam Subspecies: Arca horniii elusa
Arcida - Glycymerididae	"Glycymeris major" = Glycymerita major "Glycymeris major" = Glycymerita major Stanton 1896 clam Subspecies: Glycymeris major meganosensis

¹Moore 2003; ²Moore 2003