Location 55a, Gatun Lake area (Caimito Formation) - Woodring (1957) (Oligocene of Panama)

Also known as USGS 18846; field #216

Where: Panama (9.2° 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, tuffaceous siltstone

• No paleoenvironmentald data reported.
• Tuffaceous siltstone containing forams and molluscs.

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 42570: authorized by Austin Hendy, entered by Austin Hendy on 02.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropoda.
Bivalvia
 Pectinida - Propeamussiidae
Propeamussium pennyi3 Harris 1926 mud scallop
Gastropoda
 Opisthobranchia - Haminoeidae
"Atys (Aliculastrum) sp." = Aliculastrum2
"Atys (Aliculastrum) sp." = Aliculastrum2 Pilsbry 1896 snail
 Heterostropha - Ringiculidae
 Neotaenioglossa - Calyptraeidae
Calyptraea sp. Lamarck 1799 slipper shell
 Architaenioglossa - Ampullinidae
Ampullinopsis spenceri Cooke 1919 snail
 Neogastropoda - Olividae
Olivella sp.1 Swainson 1831 olive snail
 Neogastropoda - Terebridae
Strioterebrum sp.2 Sacco 1891 auger snail
 Sorbeoconcha - Naticidae
Sinum sp. Röding 1798 moon snail
 Cerithioidea - Turritellidae
Turritella sp. Lamarck 1799 turret shell