Location 52, Gatun Lake area [Caimito Fm] (Oligocene of Panama)

Also known as USGS 6024b

Where: Panama (9.2° N, 79.8° 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: marine; poorly lithified, shelly/skeletal marl and coarse-grained sandstone

• No paleoenvironmentald data reported.
• Foraminiferal marl and coarse sandstone.

Size classes: macrofossils, microfossils

Collected by MacDonald & Vaughan in 1911; reposited in the USNM

Collection methods: surface (in situ),

• COLLECTORS: MacDonald and Vaughan (1911). REPOSITORY: USNM.

Primary reference: W. P. Woodring. 1982. Geology and paleontology of canal zone and adjoing parts of Panama: Description of Tertiary mollusks (Pelecypods: Propeamussiidae to Cuspidariidae). United States Geological Survey Professional Paper 306(F) [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 92984: authorized by Austin Hendy, entered by Austin Hendy on 20.12.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for gastropods and bivalves. NOMENCLATURE: Authoritative publication, with relatively modern nomenclature, and species-resolution identifications.
Bivalvia
 Pectinida - Pectinoidae
Aequipecten sp., "Nodipecten denaius n. sp." = Lyropecten denaius
Aequipecten sp. Fischer 1886 scallop
"Nodipecten denaius n. sp." = Lyropecten denaius Woodring 1982 scallop