UCMP loc. 1131, Walnut Creek: Late/Upper Oligocene, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Polyplacophora
Amphineura indet.
synonym of Polyplacophora
Gastropoda - Ampullinidae
Natica (Ampullina) gabbi n. sp. Clark 1918
Gastropoda - Ranellidae
Bursa mathewsonii (Gabb 1866)
recombined as Mediargo mathewsoni
Gastropoda - Neogastropoda - Ptychatractidae
Fusinus (Exilia) lincolnensis (Weaver 1916)
original and current combination Exilia lincolnensis
Gastropoda - Neogastropoda - Cancellariidae
Cancellaria ramonensis n. sp. Clark 1918
synonym of Cancellaria oregonensis
Gastropoda - Neogastropoda - Olividae
Ancillaria fishii Gabb 1866
Nomland 1917
recombined as Ancilla fishii
Olivella quadriplicata n. sp. Clark 1918
Gastropoda - Neogastropoda - Muricidae
Thais packi Clark 1918
Gastropoda - Neogastropoda - Turridae
Turris (Pleurotoma) thurstonensis (Weaver 1916)
Turris altuscollus n. sp. Clark 1918
Gastropoda - Neogastropoda - Nassariidae
Molopophorus biplicatus (Gabb 1866)
Nomland 1917
Gastropoda - Neogastropoda - Fasciolariidae
Fusinus (Priscofusus) hecoxi (Arnold 1908)
Nomland 1917
Gastropoda - Neogastropoda - Columbellidae
Columbella (Mitrella) tenuilineata n. sp. Clark 1918
Gastropoda - Neogastropoda - Siphonaliidae
Agasoma gravidum (Gabb 1866)
Nomland 1917
recombined as Bruclarkia gravida
Searlesia dalli Clark 1918
recombined as Calicantharus dalli
Gastropoda - Neogastropoda - Buccinidae
? Chrysodomus pulcherrimus n. sp. Clark 1918
Gastropoda - Ficidae
Ficus pyriformis Gabb 1869
synonym of Ficus modesta
Gastropoda - Naticidae
Sinum scopulosum (Conrad 1849)
recombined as Sinum scopulosus
Natica (Neverita) recluziana (Deshayes 1839)
recombined as Glossaulax reclusiana
type locality of ssp. Natica (Neverita) recluziana andersoni
Natica (Euspira) ramonensis n. sp. Clark 1918
Gastropoda - Neotaenioglossa - Calyptraeidae
Calyptraea radians (Lamarck 1816)
original and current combination Trochita radians
Gastropoda - Turritellidae
Turritella sp. Lamarck 1799
Merriam 1941
Turritella porterensis Weaver 1912
as ssp. Turritella porterensis sobrantensis
Gastropoda - Trochidae
Calliostoma lawsoni Clark 1918
Gastropoda - Opisthobranchia - Cylichnidae
Cylichna ramonensis n. sp. Clark 1918
Bivalvia - Cardiida - Cardiidae
Cardium cf. vaquerosensis (Arnold 1908)
recombined as Dallocardia vaquerosense
Cardium dickersoni n. sp. Clark 1918
recombined as Clinocardium (Clinocardium) dickersoni
Bivalvia - Cardiida - Tellinidae
Metis rostellata n. sp. Clark 1918
recombined as Psammotreta (Leporimetis) rostellata
Tellina tenuilineata n. sp. Clark 1918
recombined as Tellina (Tellinella) tenuilineata
Bivalvia - Cardiida - Ungulinidae
Diplodonta stephensoni n. sp. Clark 1918
recombined as Diplodonta (Diplodonta) stephensoni
Bivalvia - Cardiida - Veneridae
Pitaria lorenzana n. sp. Clark 1918
Antigona (Ventricola) undosa Clark 1918
Dosinia whitneyi (Gabb 1866)
Nomland 1917
recombined as Dosinia (Dosinia) whitneyi
Dosinia mathewsonii Gabb 1869
Nomland 1917
synonym of Dosinia (Dosinia) whitneyi
Antigona mathewsonii (Gabb 1866)
Nomland 1917
recombined as Amiantis mathewsoni
Antigona (Artena) neglecta Clark 1918
synonym of Amiantis mathewsoni
Callocardia (Agriopoma) californica n. sp. Clark 1918
recombined as Pitaria (Katherinella) californica
Chione cryptolineata n. sp. Clark 1918
recombined as Securella cryptolineata
Chione lineolata n. sp. Clark 1918
synonym of Securella cryptolineata
Chione mediostriata n. sp. Clark 1918
synonym of Securella cryptolineata
? Macrocallista incognita n. sp. Clark 1918
Macrocallista weaveri n. sp. Clark 1918
Bivalvia - Cardiida - Mactridae
Spisula ramonensis (Packard 1916)
original and current combination Spisula albaria ramonensis
also as ssp. Spisula ramonensis attenuata
? Mulinia sp. Gray 1837
? Spisula saxadomoides n. sp. Clark 1918
recombined as Tresus saxadomoides
Bivalvia - Pholadida - Myidae
Mya (Cryptomya) incognita n. sp. Clark 1918
Bivalvia - Pholadida - Pholadidae
Pholadidea aff. penita (Conrad 1837)
recombined as Penitella penita
Bivalvia - Solenida - Solenidae
Solen (Plectosolen) curtus (Conrad 1848)
replaced by Solena (Plectosolen) conradi
Solen gravidus n. sp. Clark 1918
recombined as Solena (Plectosolen) gravidus
Bivalvia - Thraciida - Periplomatidae
Periploma undulata Clark 1918
replaced by Periploma binominata
Bivalvia - Thraciida - Thraciidae
Cyathodonta weaveri n. sp. Clark 1918
Bivalvia - Pandorida - Pandoridae
Pandora (Pandora) acutirostrata n. sp. Clark 1918
Bivalvia - Arcida - Glycymerididae
Glycimeris buwaldi n. sp. Clark 1918
recombined as Glycymeris (Glycymeris) buwaldi
Glycimeris tenuimbricata n. sp. Clark 1918
recombined as Glycymeris (Tucetona) tenuimbricata
Bivalvia - Arcida - Arcidae
Arca (Scapharca) submontereyana Clark 1918
recombined as Anadara (Anadara) submontereyana
Arca (Scapharca) mediaimpressa n. sp. Clark 1918
recombined as Anadara (Anadara) mediaimpressa
Bivalvia - Pectinida - Anomiidae
Anomia inconspicua n. sp. Clark 1918
Bivalvia - Pectinida - Pectinidae
Pecten (Pseudomuseum) alternilineatus n. sp. Clark 1918
recombined as Delectopecten alternilineatus
Bivalvia - Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758
Bivalvia - Mytilida - Mytilidae
Mytilus arnoldi Clark 1918
recombined as Mytilus (Mytilus) arnoldi
Mytilus mathewsoni Gabb 1866
Nomland 1917
recombined as Crenomytilus mathewsoni
Bivalvia - Nuculanida - Nuculanidae
Leda pulchrisinuosa n. sp. Clark 1918
recombined as Nuculana (Saccella) pulchrisinuosa
Leda ramonensis n. sp. Clark 1918
recombined as Nuculana (Saccella) ramonensis
Bivalvia - Nuculanida - Yoldiidae
Yoldia cooperi (Gabb 1865)
recombined as Yoldia (Portlandia) cooperii
as ssp. Yoldia cooperi tenuissima
Yoldia cf. oregona (Shumard 1858)
recombined as Yoldia (Kalayoldia) oregona
Bivalvia - Nuculida - Nuculidae
Nucula postangulata Clark 1918
recombined as Nucula (Leionucula) postangulata
Acila muta n. sp. Clark 1918
recombined as Acila (Truncacila) muta
also type locality of ssp. Acila muta markleyensis
Scaphopoda - Dentaliida - Dentaliidae
Dentalium radiolineata n. sp. Clark 1918
Echinoidea - Camarodonta - Strongylocentrotidae
? Strongylocentrotus sp. Brandt 1835
Anthozoa - Scleractinia - Dendrophylliidae
Dendrophyllia californiana n. sp. Nomland 1917
Nomland 1917
Anthozoa - Scleractinia - Siderastreidae
Siderastrea clarki n. sp. Nomland 1916
Nomland 1916
see common names

Geography
Country:United States State/province:California County:Contra Costa
Coordinates: 37.9° North, 122.1° West (view map)
Paleocoordinates:36.5° North, 114.3° West
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Oligocene
Stage:Chattian 10 m.y. bin:Cenozoic 4
Key time interval:Late/Upper Oligocene
Age range of interval:27.82000 - 23.03000 m.y. ago
Stratigraphy
Stratigraphic resolution:group of beds
Stratigraphy comments: "Near the base of the Agasoma gravidum zone."
Lithology and environment
Primary lithology: not reported
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Museum repositories:UCMP
Metadata
Database number:122273
Authorizer:W. Kiessling, J. Marcot Enterer:U. Merkel, J. Marcot
Modifier:J. Marcot Research group:marine invertebrate
Created:2011-12-20 21:52:51 Last modified:2024-04-02 16:40:28
Access level:authorizer only Released:2012-12-20 21:52:51
Creative Commons license:CC BY
Reference information

Primary reference:
77392. B. L. Clark. 1918. The San Lorenzo series of Middle California. a stratigraphic and paleontologic study of the San Lorenzo Oligocene series of the general region of Mount Diablo, California. University of California Publications Bulletin of the Department of Geology 11(2):45-234 [J. Marcot/J. Marcot]

Secondary references:

24235 C. W. Merriam. 1941. Fossil Turritellas from the Pacific Coast region of North America. University of California Publications Bulletin of the Department of Geological Sciences 26(1):1-214 [A. Hendy/A. Hendy]
38924 J. O. Nomland. 1916. Corals from the Cretaceous and Tertiary of California and Oregon. University of California Publications Bulletin of the Department of Geology 9(5):59-76 [W. Kiessling/U. Merkel/P. Holroyd]
38923 J. O. Nomland. 1917. New fossil corals from the Pacific coast. University of California Publications in Geology 10(13):185-190 [W. Kiessling/U. Merkel]