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
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
Scaphopoda | |
Dentalium cooperi Gabb 1864 tusk shell | |
Bivalvia | |
"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
| |
"Crassatellites meganosensis n. sp." = Crassatella meganosensis
"Crassatellites meganosensis n. sp." = Crassatella meganosensis Clark and Woodford 1927 clam | |
Venericardia hornii Gabb 1864 clam | |
"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 | |
"Cardium (Protocardium) marysvillensis" = Nemocardium (Nemocardium) linteum
"Cardium (Protocardium) marysvillensis" = Nemocardium (Nemocardium) linteum Conrad 1855 cockle | |
"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 | |
| |
"Diplodonta cretacea" = Diplodonta (Diplodonta) cretacea
"Diplodonta cretacea" = Diplodonta (Diplodonta) cretacea Gabb 1864 clam | |
Pitaria californica, Pitar uvasana, "Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis, Dosiniopsis stewartvillensis n. sp., Pitaria conradi
"Macrocallista meganosensis n. sp." = Microcallista (Costacallista) conradiana meganosensis Clark and Woodford 1927 venus clam
Dosiniopsis stewartvillensis n. sp. Clark and Woodford 1927 venus clam
Pitaria conradi Dickerson 1916 venus clam | |
"Spisula meganosensis n. sp." = Pseudocardium meganosensis
"Spisula meganosensis n. sp." = Pseudocardium meganosensis Clark and Woodford 1927 clam | |
"Solen cf. parallelus" = Solena (Plectosolen) parallelus Gabb 1864 clam | |
Nucula (Acila) gabbiana Dickerson 1916 nut clam | |
Gastropoda | |
Solariella hartleyensis n. sp.
Solariella hartleyensis n. sp. Clark and Woodford 1927 snail | |
"Scaphander cf. costatus" = Scaphander (Mirascapha) costatus
"Scaphander cf. costatus" = Scaphander (Mirascapha) costatus Gabb 1864 snail | |
Acteon sp. Montfort 1810 snail | |
Turritella meganosensis n. sp. Clark and Woodford 1927 turret shell
Turritella merriami Dickerson 1913 turret shell | |
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 | |
Brachysphingus mammilatus, "Siphonalia cf. sutterensis" = Siphonalia (Nassicola) sutterensis, ? Parvisipho meganosensis n. sp.
Brachysphingus mammilatus Clark and Woodford 1927 true whelk
"Siphonalia cf. sutterensis" = Siphonalia (Nassicola) sutterensis Dickerson 1913 true whelk
? Parvisipho meganosensis n. sp. Clark and Woodford 1927 true whelk | |
Molopophorus californicus n. sp.
Molopophorus californicus n. sp. Clark and Woodford 1927 snail | |
Bulbifusus californicus Clark and Woodford 1927 snail | |
"Admete (Bonellitia) cf. stantoni" = Bonellitia (Admetula) paucivaricata
"Admete (Bonellitia) cf. stantoni" = Bonellitia (Admetula) paucivaricata Gabb 1864 snail | |
Gemmula wattsi Anderson and Hanna 1925 turrid | |
? Turricula cooperi Dickerson 1916 snail | |
Drillia hartleyensis n. sp.
Drillia hartleyensis n. sp. Clark and Woodford 1927 snail |