near the Avenal wells in Big Tar Canyon (Eocene of the United States)

Where: California (35.9° N, 120.1° W: paleocoordinates 38.5° N, 103.0° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Avenal Formation, Early/Lower Eocene (55.8 - 48.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; sandstone

• light-gray sandstone, 300 to 400 feet thick
• Silt, sand and conglomerate

Size classes: macrofossils, mesofossils, microfossils

Primary reference: R. B. Stewart. 1946. Geology of Reef Ridge Coalinga district California. United States Geological Survey Professional Paper 205C:81-115 [W. Kiessling/M. Krause/J. Marcot]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 167604: authorized by Wolfgang Kiessling, entered by Mihaela Krause on 25.03.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Polychaeta
  -
Spiroglyphus ? sp. Daudin 1800
Bivalvia
 Arcida - Glycymerididae
 Mytilida - Mytilidae
Brachidontes sp. Swainson 1840 mussel
 Carditida - Crassatellidae
Crassatella sp. Lamarck 1799 clam
 Carditida - Carditidae
 Cardiida - Mactridae
Spisula sp. Gray 1837 clam
 Cardiida - Veneridae
Pitar uvasanus venus clam
Pitar ? joaquinensis Vokes 1939 venus clam
 Cardiida - Psammobiidae
Gari sp. Schumacher 1817 clam
 Cardiida - Cardiidae
Nemocardium sp., "Plagiocardium (Schedocardia) sp." = Acanthocardia (Schedocardia)
Nemocardium sp. Meek 1876 cockle
"Plagiocardium (Schedocardia) sp." = Acanthocardia (Schedocardia) cockle
 Lucinida - Lucinidae
Lucina sp. Bruguière 1797 clam
 Nuculida - Nuculidae
Acila sp. Adams and Adams 1858 divaricate nutclam
Gastropoda
 Cephalaspidea - Retusidae
"Cylichnina sp." = Retusa (Cylichnina)
"Cylichnina sp." = Retusa (Cylichnina) Monterasato 1884 snail
 Cephalaspidea - Cylichnidae
Scaphander sp. Monfort 1810 snail
 Architaenioglossa - Ampullinidae
Globularia (Eocernina) sp. Swainson 1840 snail
"Amaurellina clarki" = Pachycrommium clarki Stewart 1927 snail
 Neogastropoda - Olivellidae
Agaronia sp. Gray 1839 snail
 Neogastropoda - Buccinidae
Pseudoliva sp. Swainson 1840 true whelk
 Neogastropoda - Buccinulidae
Umpquaia sp. Turner 1938 snail
 Neogastropoda - Nassariidae
Molopophorus sp. Gabb 1869 snail
 Neogastropoda - Fasciolariidae
 Neogastropoda - Cancellariidae
Bonellitia sp. Jousseaume 1887 snail
 Neogastropoda - Volutidae
Lyria sp. Gray 1847 volute
 Neogastropoda - Volutomitridae
"Mitra (cf. Mitra) cretacea" = Proximitra cretacea
"Mitra (cf. Mitra) cretacea" = Proximitra cretacea Gabb 1864 snail
 Neogastropoda - Turridae
Pleurofusia sp. de Gregorio 1890 turrid
 Neogastropoda - Conidae
Conus sp. Linnaeus 1758 cone shell
Moniliopsis sp. Conrad 1865 cone shell
 Neogastropoda - Terebridae
Terebra sp. Bruguière 1789 auger snail
 Stromboidea - Strombidae
"Ectinochilus sp." = Rimella, Terebellum sp.
"Ectinochilus sp." = Rimella Agasiz 1841 true conch
Terebellum sp. Röding 1798 true conch
 Ficoidea - Ficidae
 Naticoidea - Naticidae
Sinum sp. Röding 1798 moon snail
Euspira sp. Agassiz 1837 moon snail
Neverita sp. Risso 1826 moon snail
 Calyptraeoidea - Calyptraeidae
Calyptraea sp. Lamarck 1799 slipper shell
 Tonnoidea - Ranellidae
"Personella sp." = Sassia (Personella)
"Personella sp." = Sassia (Personella) Conrad 1865 triton shell
 Tonnoidea - Bursidae
Ranellina sp. Conrad 1865 frog shell
Olequahia sp. Stewart 1927 frog shell
 Sorbeoconcha - Turritellidae
Turritella uvasana Conrad 1865 turret shell
Turritella buwaldana Dickerson 1916 turret shell
 Tectibranchia - Akeridae
Akera sp. Muller 1776 snail