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
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
Scaphopoda | |
Dentalium stramineum Gabb 1864 tusk shell
Dentalium cooperi Gabb 1864 tusk shell | |
Gastropoda | |
Architectonica sp. Röding 1798 sundial | |
Acteon sp. Montfort 1810 snail | |
Turritella merriami Dickerson 1913 turret shell | |
Galeodea sutterensis Dickerson 1916 snail | |
Oliva meganosensis n. sp.
Oliva meganosensis n. sp. Clark and Woodford 1927 olive snail | |
Molopophorus californicus Clark and Woodford 1927 snail | |
Brachysphingus mammilatus Clark and Woodford 1927 true whelk
? Strepsidura diabloensis n. sp. Clark and Woodford 1927 true whelk | |
Bulbifusus californicus n. sp.
Bulbifusus californicus n. sp. Clark and Woodford 1927 snail | |
Drillia hartleyensis Clark and Woodford 1927 snail | |
? Turricula cooperi Dickerson 1916 snail | |
"Admete (Bonellitia) cf. stantoni" = Bonellitia (Admetula) paucivaricata
"Admete (Bonellitia) cf. stantoni" = Bonellitia (Admetula) paucivaricata Gabb 1864 snail | |
"Polinices (Euspira) hornii" = Polinices hornii, Polinices (Euspira) nuciformis
"Polinices (Euspira) hornii" = Polinices hornii Gabb 1864 moon snail
Polinices (Euspira) nuciformis Gabb 1864 moon snail | |
"Scaphander cf. costatus" = Scaphander (Mirascapha) costatus
"Scaphander cf. costatus" = Scaphander (Mirascapha) costatus Gabb 1864 snail | |
Bivalvia | |
"Yoldia mortuasusensis n. sp." = Portlandia (Portlandia) mortuasusensis
"Yoldia mortuasusensis n. sp." = Portlandia (Portlandia) mortuasusensis Clark and Woodford 1927 clam | |
"Leda gabbi" = Nuculana (Saccella) gabbii
"Leda gabbi" = Nuculana (Saccella) gabbii Conrad 1866 pointed nut clam | |
Nucula (Acila) gabbiana Dickerson 1916 nut clam | |
"Modiolus (Brachydontes) ornatus" = Brachidontes (Brachidontes) cowlitzensis
"Modiolus (Brachydontes) ornatus" = Brachidontes (Brachidontes) cowlitzensis Weaver and Palmer 1922 mussel | |
"Glycymeris major" = Glycymerita major
| |
"Arca hornii" = Pachecoa hornii
| |
"Phacoides meganosensis n. sp." = Miltha (Miltha) meganosensis
"Phacoides meganosensis n. sp." = Miltha (Miltha) meganosensis Clark and Woodford 1927 clam | |
Martesia meganosensis n. sp.
Martesia meganosensis n. sp. Clark and Woodford 1927 clam | |
Corbula diaboli Clark and Woodford 1927 clam | |
"Spisula meganosensis n. sp." = Pseudocardium meganosensis
"Spisula meganosensis n. sp." = Pseudocardium meganosensis Clark and Woodford 1927 clam | |
Pitaria conradi, Pitaria californica, Pitar uvasana, Dosiniopsis stewartvillensis n. sp., "Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis
Pitaria conradi Dickerson 1916 venus clam
Dosiniopsis stewartvillensis n. sp. Clark and Woodford 1927 venus clam
"Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis Clark and Woodford 1927 venus clam | |
"Cardium (Protocardiun) marysvillensis" = Nemocardium (Nemocardium) linteum
"Cardium (Protocardiun) marysvillensis" = Nemocardium (Nemocardium) linteum Conrad 1855 cockle | |
"Tellina longa" = Tellina (Angulus) longa
"Tellina longa" = Tellina (Angulus) longa Gabb 1864 tellin clam | |
"Solen cf. parallelus" = Solena (Plectosolen) parallelus
"Solen cf. parallelus" = Solena (Plectosolen) parallelus Gabb 1864 clam |