U.C. Location S. 8054 (Zone C) - Clark and Durham (1946) (Eocene of Colombia)

Also known as S. 8054

Where: Sucre, Colombia (9.7° N, 75.2° W: paleocoordinates 7.3° N, 68.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Late/Upper Eocene (37.2 - 33.9 Ma)

• No lithostratigraphic nomenclature for these collections. Deposits of late Eocene age, referred to as Zone C. Correlatable on the basis of faunas to the Saman Formation and Chira Shales of Peru (upper Eocene to Oligocene) and upper Jackson Formation of the Gulf Coast, USA (Bartonian). The Eocene in the Sucre region of Columbia reaches 4,500 ft in thickness, of which the collections span the upper portion of Anderson's (1928) unit F (600 ft), near the top of this succession.

• bed-level stratigraphic resolution

Environment/lithology: coastal; pebbly, gray, conglomeratic sandstone and fine-grained, shelly/skeletal, calcareous sandstone

• Deposit probably formed close to shoreline, tropical.
• Fossils from three facies: conglomeratic gray sandstone with pebbles up to a quarter inch in diameter; dark-gray, medium-fine bituminous-stained sandstone; fine calcareous shelly sandstone/coquina.

Size class: macrofossils

Reposited in the CAS, UCMP

Collection methods: quarrying,

• Collected by the Standard Oil Company of California. Held in repositories at both CAS and UCMP.

Primary reference: B. L. Clark and J. W. Durham. 1946. Eocene Faunas from the Department of Bolivar, Colombia. Geological Society of America Memoir 16:1-126 [M. Patzkowsky/K. Layou/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42840: authorized by Austin Hendy, entered by Austin Hendy on 05.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for mollusca (identified by B.L. Clark).
Bivalvia
 Pholadida - Corbulidae
Corbula (Caryocorbula) alabamiensis Lea 1833 clam
New variant or subspecies
 Cardiida - Mactridae
Gastropoda
 Architaenioglossa - Ampullinidae
Ampullella woodringi Clark and Durham 1946 snail
 Neogastropoda - Buccinidae
Cantharus (Eocantharus) colombiana Clark and Durham 1946 true whelk
 Neogastropoda - Volutidae
Cryptochorda (Neocryptochorda) vientoensis Clark and Durham 1946 volute
 Neogastropoda - Conidae
"Conus (Lithoconus) sauridens" = Conus sauridens
"Conus (Lithoconus) sauridens" = Conus sauridens Conrad 1833 cone shell
Subspecies: C. (L.) sauridens chiraensis
 Naticoidea - Naticidae
Polinices (Euspira) vientoensis Clark and Durham 1946 moon snail
Neverita (Glossaulax) bolivarensis Clark and Durham 1946 moon snail
Crommium palmerae Clark and Durham 1946 moon snail
 Cypraeoidea - Pediculariidae
Cypraedia carmenensis Clark and Durham 1946 snail
 Calyptraeoidea - Calyptraeidae
"Calyptraea cf. aperta" = Calyptraea (Trochita) aperta
"Calyptraea cf. aperta" = Calyptraea (Trochita) aperta Solander 1766 slipper shell
 Sorbeoconcha - Turritellidae
Turritella salchica Olsson 1931 turret shell
Turritella vientoensis Clark and Durham 1946 turret shell
New subspecies?
 Architectonicoidea - Architectonicidae
"Architectonica (Stellaxis) alveata" = Architectonica (Stellaxis) alveatum
"Architectonica (Stellaxis) alveata" = Architectonica (Stellaxis) alveatum Conrad 1833 sundial
Cephalopoda
 Nautilida - Aturiidae
Aturia sp. Bronn 1838 nautiloid