CSUN Loc. 979 [Juncal Fm] (Eocene of the United States)

Where: Ventura County, California (34.8° N, 119.2° W: paleocoordinates 35.5° N, 105.1° W)

• outcrop-level geographic resolution

When: Juncal Formation, Lutetian (47.8 - 41.3 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; poorly lithified, lag, argillaceous siltstone and poorly lithified sandstone

• the juncal formation in northern lockwood valley is 605 m thick and consists predominantly of muddy siltstone with minor amounts of sandstone and scattered lenses with fossils. lenses are fine to coarse sandstone representing storm lag deposits.

Size class: macrofossils

Reposited in the LACM

Collection methods: bulk,

• Samples were taken for microfossil (nannos and planktonic forams) collection, but all were barren.

Primary reference: R. L. Squires. 1988. Eocene Macropaleontology of Northern Lockwood Valley, Ventura County, California. Contributions in Science (Natural History Museum of Los Angeles County) 398:1-23 [A. Miller/K. Layou]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 5532: authorized by Arnold Miller, entered by Karen Layou on 11.10.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Scaphopoda
 Dentaliida - Dentaliidae
Coccodentalium emersoni n. sp.
Coccodentalium emersoni n. sp. Squires 1988 tusk shell
Bivalvia
 Mytilida - Mytilidae
Brachidontes cowlitzensis
Brachidontes cowlitzensis Weaver and Palmer 1922 mussel
 Carditida - Carditidae
"Glyptoactis domenginica" = Glyptoactis (Claibornicardia) domenginica
"Glyptoactis domenginica" = Glyptoactis (Claibornicardia) domenginica Vokes 1939 clam
 Cardiida - Veneridae
Pitar joaquinensis
Pitar joaquinensis Vokes 1939 venus clam
 Nuculida - Nuculidae
Acila (Truncacila) decisa
Acila (Truncacila) decisa Conrad 1855 divaricate nutclam
Gastropoda
 Trochoidea - Turbinidae
Homalopoma umpquaensis
Homalopoma umpquaensis Merriam and Turner 1937 snail
as ssp. "Homalopoma umpquaensis domenginensis"
 Opisthobranchia - Retusidae
Cylichnina tantilla
Cylichnina tantilla Anderson and Hanna 1925 snail
 Heterostropha - Architectonicidae
"Architectonica cognata" = Architectonica (Stellaxis) cognata
"Architectonica cognata" = Architectonica (Stellaxis) cognata Gabb 1864 sundial
 Cerithioidea - Cerithiidae
"Bittium ? dumblei" = Cerithium dumblei
"Bittium ? dumblei" = Cerithium dumblei Dickerson 1916 cerith snail
 Cerithioidea - Turritellidae
Turritella buwaldana, Turritella andersoni
Turritella buwaldana Dickerson 1916 turret shell
Turritella andersoni Dickerson 1916 turret shell
 Sorbeoconcha - Naticidae
Amaurellina caleocia
Amaurellina caleocia Vokes 1939 moon snail
 Sorbeoconcha - Ficidae
"Ficopsis crescentensis" = Ficopsis remondii crescentensis
"Ficopsis crescentensis" = Ficopsis remondii crescentensis Weaver and Palmer 1922 fig shell
Ficopsis remondii crescentensis
 Neogastropoda - Fasciolariidae
Clavilithes tabulatus
Clavilithes tabulatus Dickerson 1913 snail
 Neogastropoda - Conidae
Conus caleocius
Conus caleocius Vokes 1939 cone shell
 Neogastropoda - Clavatulidae
"Cryptoconus cooperi" = Turricula cooperi
"Cryptoconus cooperi" = Turricula cooperi Dickerson 1916 snail
 Sorbeoconcha - Strombidae
Ectinochilus macilentus
Ectinochilus macilentus White 1889 true conch
 Sorbeoconcha - Xenophoridae
Xenophora stocki
Xenophora stocki Dickerson 1916 carrier shell
 Neotaenioglossa - Calyptraeidae
Calyptraea diegoana
Calyptraea diegoana Conrad 1855 slipper shell