UCMP loc. 3151, north of Mount Diablo: Ypresian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Echinoidea
- Cidaroida
- Cidaridae
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Hesperocidaris merriami
(Arnold 1908)
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Grant and Hertlein 1938 | |||||||||
| original and current combination Cidaris merriami | ||||||||||
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Echinoidea
- Spatangoida
- Schizasteridae
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Schizaster cordiformis
Kew 1920
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Grant and Hertlein 1938 | |||||||||
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Bivalvia
- Mytilida
- Mytilidae
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Modiolus (Brachydontes) ornatus
(Gabb 1864)
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U category | |||||||||
| synonym of Brachidontes (Brachidontes) cowlitzensis | ||||||||||
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Bivalvia
- Arcida
- Glycymerididae
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Glycymeris major
(Stanton 1896)
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U category | |||||||||
| recombined as Glycymerita major | ||||||||||
| Subspecies: Glycymeris major meganosensis | ||||||||||
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Bivalvia
- Lucinida
- Lucinidae
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Phacoides meganosensis n. sp.
Clark and Woodford 1927
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U category | |||||||||
| recombined as Miltha (Miltha) meganosensis | ||||||||||
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Bivalvia
- Cardiida
- Psammobiidae
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Psammobia sp.
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U category | |||||||||
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= Gari (Gobraeus) sp.
Brown 1844
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Moore 2003 | |||||||||
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Bivalvia
- Cardiida
- Veneridae
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Pitar uvasana
(Conrad 1855)
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U category | |||||||||
| Subspecies: Pitaria uvasana marshallensis | ||||||||||
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Macrocallista meganosensis n. sp.
Clark and Woodford 1927
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U category | |||||||||
| recombined as Microcallista (Costacallista) conradiana meganosensis | ||||||||||
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Bivalvia
- Cardiida
- Mactridae
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Spisula tejonensis
Packard 1916
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U category | |||||||||
| recombined as Mactromeris tejonensis | ||||||||||
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Spisula meganosensis n. sp.
Clark and Woodford 1927
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U category | |||||||||
| recombined as Pseudocardium meganosensis | ||||||||||
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Gastropoda
- Opisthobranchia
- Cylichnidae
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Scaphander cf. costatus
(Gabb 1864)
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U category | |||||||||
| recombined as Scaphander (Mirascapha) costatus | ||||||||||
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Gastropoda
- Turritellidae
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Turritella meganosensis n. sp.
Clark and Woodford 1927
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U category | |||||||||
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Turritella merriami
Dickerson 1913
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U category | |||||||||
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Gastropoda
- Naticidae
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Polinices (Euspira) nuciformis
(Gabb 1864)
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U category | |||||||||
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Gastropoda
- Ficidae
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Ficopsis meganosensis n. sp.
Clark and Woodford 1927
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U category | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | California | County: | Contra Costa |
| Coordinates: | 37.9° North, 121.8° West (view map) | ||||
| Paleocoordinates: | 40.6° North, 104.6° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Ypresian | 10 m.y. bin: | Cenozoic 2 |
| Key time interval: | Ypresian | ||
| Age range of interval: | 56.00000 - 47.80000 m.y. ago |
Stratigraphy
| Formation: | Meganos | ||||
| Local section: | Mount Diablo | Local bed: | D | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "Meganos" faunas represent upper Bulitian and lower Penutian local ages=Ypresian | |||||
Lithology and environment
| Primary lithology: | fine,pebbly lithified calcareous sandstone |
| Includes fossils? | Y |
| Lithology description: 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. | |
| Environment: | coastal indet. |
| Geology comments: Shallow marine coastal siliciclastic environment | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | UCMP |
| Collection method comments: Collected by Clark and Woodford. Collections reposited at UCMP. | |
| Taxonomic list comments:Identified by Clark and Stewart. | |
Metadata
| Database number: | 52421 | ||
| Authorizer: | A. Hendy, M. Uhen | Enterer: | A. Hendy, M. Uhen |
| Modifier: | J. Marcot | Research group: | marine invertebrate |
| Created: | 2005-08-05 08:30:41 | Last modified: | 2020-12-07 23:57:54 |
| Access level: | the public | Released: | 2005-08-05 08:30:41 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 14099. | 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] |
Secondary references:
| 32966 | U. S. Grant and L. G. Hertlein. 1938. The West American Cenozoic Echinoidea. Publications of the University of California at Los Angeles in Mathematical and Physical Sciences 2:1-225 [L. Villier/L. Villier] | |
| 24521 | E. J. Moore. 2003. Tertiary marine pelecypods of California and Baja California, Chapter G: Tellinidae, Donacidae, Psammobiliidae, Semelidae:. 1-55 [A. Hendy/A. Hendy/J. Marcot] |