UCMP 3158, 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: 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 52425: 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
 Cerithioidea - Turritellidae
Turritella merriami
Turritella merriami Dickerson 1913 turret shell
 Neogastropoda - Buccinidae
Brachysphingus mammilatus
Brachysphingus mammilatus Clark and Woodford 1927 true whelk
 Neogastropoda - Olividae
Oliva meganosensis n. sp.
Oliva meganosensis n. sp. Clark and Woodford 1927 olive snail
Bivalvia
 Cardiida - Mactridae
"Spisula tejonensis" = Mactromeris tejonensis, "Spisula meganosensis n. sp." = Pseudocardium meganosensis
"Spisula tejonensis" = Mactromeris tejonensis Packard 1916 clam
"Spisula meganosensis n. sp." = Pseudocardium meganosensis Clark and Woodford 1927 clam
 Cardiida - Veneridae
"Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis, Pitaria palmeri n. sp.
"Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis Clark and Woodford 1927 venus clam
Pitaria palmeri n. sp. Clark and Woodford 1927 venus clam
 Cardiida - Cardiidae
"Cardium (Protocardium) marysvillensis" = Nemocardium (Nemocardium) linteum
"Cardium (Protocardium) marysvillensis" = Nemocardium (Nemocardium) linteum Conrad 1855 cockle
 Pholadida - Pholadidae
Jouannetia sp.
Jouannetia sp. Des Moulins 1828 clam
 Pandorida - Lyonsiidae
Lyonsia venturaensis
Lyonsia venturaensis Clark and Woodford 1927 clam