Location 54l, Gatun Lake area (Caimito Formation) - Woodring (1957) (Oligocene of Panama)

Also known as USGS 18842; field #212

Where: Panama (9.1° N, 79.9° W: paleocoordinates 7.7° N, 77.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Middle Member (Caimito Formation), Late/Upper Oligocene (28.4 - 23.0 Ma)

• From middle member. Three members of the Caimito Formation are recognized in the Gatun Lake area: lower, middle, and upper. The lower member is predominantly conglomerate and tuffaceous sandstone; the middle member consists of tuffaceous sandstone; the upper member comprises tuff and tuffaceous siltstone. The thickness of the Caimito Formation in the Gatun Lake area is around 300 m or more. Larger foraminifera support a late Oligocene age; corals favor a late Oligocene age, although early Miocene is unlikely; molluscs also confirm an Oligocene age.

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, shelly/skeletal, calcareous sandstone

• No paleoenvironmentald data reported.
• Gritty sandstone containing larger foraminifera and mollusks, and somewhat calcareous sandstone containing mollusks.

Size classes: macrofossils, microfossils

Reposited in the USNM

Collection methods: quarrying,

• Collected by Woodring (1954). Material is also held (but not specified for any specific collection) at Stanford University, Acad. Nat. Sci. Phil., Corenell University, PRI, U. Cal. and Cal. Acad. Sci.

Primary reference: W. P. Woodring. 1957. Geology and Paleontology of Canal Zone and adjoining parts of Panama. United States Geological Survey Professional Paper 306(A) [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42573: authorized by Austin Hendy, entered by Austin Hendy on 02.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda.
Bivalvia
 Nuculida - Nuculidae
Acila (Acila) isthmica3 Brown and Pilsbry 1911 divaricate nutclam
Subspecies: Acila (Acila) isthmica isthmica
 Cardiida - Anatinellidae
Raeta cf. gardnerae4 Spieker 1922 clam
 Cardiida - Veneridae
? Cyclinella sp.4 Dall 1902 venus clam
Scaphopoda
 Dentaliida - Dentaliidae
"Dentalium (Fissidentalium) uscarianum" = Fissidentalium uscarianum3
"Dentalium (Fissidentalium) uscarianum" = Fissidentalium uscarianum3 Olsson 1922 tusk shell
Gastropoda
 Sorbeoconcha - Cassidae
"Semicassis (Echinophoria) sp." = Echinophoria1
"Semicassis (Echinophoria) sp." = Echinophoria1 Sacco 1890 snail
 Sorbeoconcha - Ficidae
Ficus cf. pilsbryi1 Smith 1907 fig shell
 Thecosomata - Cavoliniidae
 Trochoidea - Solariellidae
? Solariella sp. Wood 1842 snail