UCMP loc. 3577, Dry Creek (Eocene of the United States)

Where: Contra Costa County, California (37.9° N, 121.7° 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)]" but 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 52428: 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 stramineum, Dentalium cooperi
Dentalium stramineum Gabb 1864 tusk shell
Dentalium cooperi Gabb 1864 tusk shell
Gastropoda
 Heterostropha - Architectonicidae
Architectonica sp.
Architectonica sp. Röding 1798 sundial
 Heterostropha - Acteonidae
Acteon sp.
Acteon sp. Montfort 1810 snail
 Cerithioidea - Turritellidae
Turritella merriami
Turritella merriami Dickerson 1913 turret shell
 Sorbeoconcha - Cassidae
Galeodea sutterensis
Galeodea sutterensis Dickerson 1916 snail
 Neogastropoda - Olividae
Oliva meganosensis n. sp.
Oliva meganosensis n. sp. Clark and Woodford 1927 olive snail
 Neogastropoda - Nassariidae
Molopophorus californicus
Molopophorus californicus Clark and Woodford 1927 snail
 Neogastropoda - Buccinidae
Brachysphingus mammilatus, ? Strepsidura diabloensis n. sp.
Brachysphingus mammilatus Clark and Woodford 1927 true whelk
? Strepsidura diabloensis n. sp. Clark and Woodford 1927 true whelk
 Neogastropoda - Fasciolariidae
Bulbifusus californicus n. sp.
Bulbifusus californicus n. sp. Clark and Woodford 1927 snail
 Neogastropoda - Drilliidae
Drillia hartleyensis
Drillia hartleyensis Clark and Woodford 1927 snail
 Neogastropoda - Clavatulidae
? Turricula cooperi
? Turricula cooperi Dickerson 1916 snail
 Neogastropoda - Cancellariidae
"Admete (Bonellitia) cf. stantoni" = Bonellitia (Admetula) paucivaricata
"Admete (Bonellitia) cf. stantoni" = Bonellitia (Admetula) paucivaricata Gabb 1864 snail
 Sorbeoconcha - Naticidae
"Polinices (Euspira) hornii" = Polinices hornii, Polinices (Euspira) nuciformis
"Polinices (Euspira) hornii" = Polinices hornii Gabb 1864 moon snail
Polinices (Euspira) nuciformis Gabb 1864 moon snail
 Opisthobranchia - Cylichnidae
"Scaphander cf. costatus" = Scaphander (Mirascapha) costatus
"Scaphander cf. costatus" = Scaphander (Mirascapha) costatus Gabb 1864 snail
Bivalvia
 Nuculanida - Sareptidae
"Yoldia mortuasusensis n. sp." = Portlandia (Portlandia) mortuasusensis
"Yoldia mortuasusensis n. sp." = Portlandia (Portlandia) mortuasusensis Clark and Woodford 1927 clam
 Nuculanida - Nuculanidae
"Leda gabbi" = Nuculana (Saccella) gabbii
"Leda gabbi" = Nuculana (Saccella) gabbii Conrad 1866 pointed nut clam
 Nuculida - Nuculidae
Nucula (Acila) gabbiana
Nucula (Acila) gabbiana Dickerson 1916 nut clam
 Mytilida - Mytilidae
"Modiolus (Brachydontes) ornatus" = Brachidontes (Brachidontes) cowlitzensis
"Modiolus (Brachydontes) ornatus" = Brachidontes (Brachidontes) cowlitzensis Weaver and Palmer 1922 mussel
 Arcida - Glycymerididae
"Glycymeris major" = Glycymerita major
"Glycymeris major" = Glycymerita major Stanton 1896 clam
Subspecies: Glycymeris major meganosensis
 Arcida - Arcidae
"Arca hornii" = Pachecoa hornii
"Arca hornii" = Pachecoa hornii Gabb 1864 clam
Subspecies: Arca hornii elusa
 Lucinida - Lucinidae
"Phacoides meganosensis n. sp." = Miltha (Miltha) meganosensis
"Phacoides meganosensis n. sp." = Miltha (Miltha) meganosensis Clark and Woodford 1927 clam
 Pholadida - Pholadidae
Martesia meganosensis n. sp.
Martesia meganosensis n. sp. Clark and Woodford 1927 clam
 Pholadida - Corbulidae
Corbula diaboli
Corbula diaboli Clark and Woodford 1927 clam
 Cardiida - Mactridae
"Spisula meganosensis n. sp." = Pseudocardium meganosensis
"Spisula meganosensis n. sp." = Pseudocardium meganosensis Clark and Woodford 1927 clam
 Cardiida - Veneridae
Pitaria conradi, Pitaria californica, Pitar uvasana, Dosiniopsis stewartvillensis n. sp., "Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis
Pitaria conradi Dickerson 1916 venus clam
Pitaria californica Clark 1918 venus clam
Subspecies: Pitaria californica stewartvillensis
Pitar uvasana Conrad 1855 venus clam
Subspecies: Pitaria uvasana marshallensis
Dosiniopsis stewartvillensis n. sp. Clark and Woodford 1927 venus clam
"Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis Clark and Woodford 1927 venus clam
 Cardiida - Cardiidae
"Cardium (Protocardiun) marysvillensis" = Nemocardium (Nemocardium) linteum
"Cardium (Protocardiun) marysvillensis" = Nemocardium (Nemocardium) linteum Conrad 1855 cockle
 Cardiida - Tellinidae
"Tellina longa" = Tellina (Angulus) longa
"Tellina longa" = Tellina (Angulus) longa Gabb 1864 tellin clam
 Solenida - Solenidae
"Solen cf. parallelus" = Solena (Plectosolen) parallelus
"Solen cf. parallelus" = Solena (Plectosolen) parallelus Gabb 1864 clam