UCMP loc. 3150, north of Mount Diablo (Eocene of the United States)

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

• 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 52420: 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
Gastropoda
 Opisthobranchia - Haminoeidae
Haminea postangulata n. sp.
Haminea postangulata n. sp. Clark and Woodford 1927 snail
 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
Fusinus meganosensis n. sp.
Fusinus meganosensis n. sp. Clark and Woodford 1927 snail
 Cerithioidea - Turritellidae
Turritella meganosensis n. sp., Turritella merriami
Turritella meganosensis n. sp. Clark and Woodford 1927 turret shell
Turritella merriami Dickerson 1913 turret shell
Bivalvia
 Nuculanida - Nuculanidae
"Leda gabbi" = Nuculana (Saccella) gabbii
"Leda gabbi" = Nuculana (Saccella) gabbii Conrad 1866 pointed nut clam
 Arcida - Glycymerididae
"Glycymeris major" = Glycymerita major
"Glycymeris major" = Glycymerita major Stanton 1896 clam
Subspecies: Glycymeris major meganosensis
 Pholadida - Corbulidae
Corbula diaboli n. sp.
Corbula diaboli n. sp. Clark and Woodford 1927 clam
 Cardiida - Tellinidae
Tellina remondii, "Tellina joaquinensis" = Tellina (Angulus) joaquinensis
Tellina remondii Gabb 1864 tellin clam
"Tellina joaquinensis" = Tellina (Angulus) joaquinensis Arnold 1909 tellin clam
 Cardiida - Veneridae
Pitaria conradi, "Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis, Pitar uvasana
Pitaria conradi Dickerson 1916 venus clam
"Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis Clark and Woodford 1927 venus clam
Pitar uvasana Conrad 1855 venus clam
Subspecies and mistyped: Pitaria (Uvasana) marshallensis
 Cardiida - Mactridae
"Spisula meganosensis n. sp." = Pseudocardium meganosensis
"Spisula meganosensis n. sp." = Pseudocardium meganosensis Clark and Woodford 1927 clam