Location 40b, Gatun Lake area (Bohio Formation) - Woodring (1957): Late Eocene, Panama

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Naticidae
Gastropoda - Turritellidae
Bivalvia - Cardiida - Cardiidae
Woodring 1982 r category
Subspecies: Schedocardia gatunensis gatunensis
unclassified
Woodring 1973 r category
see common names

Geography
Country:Panama
Coordinates: 9.2° North, 79.9° West (view map)
Paleocoordinates:
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Eocene
Stage: Priabonian 10 m.y. bin: Cenozoic 3
Key time interval: Late Eocene
Age range of interval: 37.71 - 33.9 m.y. ago
Stratigraphy
Formation:Bohio
Stratigraphic resolution:bed
Stratigraphy comments: Marine strata of early Tertiary age in the Gatun Lake area are tentatively designated the marine member of the Bohio Formation. They are thought to represent a marine tongue in the lower part of what is essentially a non-marine formation. The age is disputed. Large foraminifera point to a late Eocene age and are unlikely to reworked, but large foraminifera of Oligocene age were undescribed from the Carribean at the time of writing. Mollusa have regional Eocene affinities, although others have later affinities. The most amrked faunal similariies are with the late Eocene of Columbia and the late Eocene-early Oligocene of Peru. A late Eocene-early Oligocene age was assigned to these collections. A literature search has failed to resolve this age any finer for this "tongue".
Lithology and environment
Primary lithology:concretionary,tuffaceous silty,calcareous sandstone
Secondary lithology:pebbly conglomerate
Includes fossils?Y
Includes fossils?Y
Lithology description: Strata consist of dark tuffaceous silty sandstone, containing practically black calcareous concretions, and small-pebble conglomerate. Fossils were found in the calcareous concretions and also in the sandstone. A thickness of 95 feet (29 m) was reported for this section.
Environment:coastal indet.
Geology comments: A marine tongue within a overall non-marine lithostratigraphic unit.
Taphonomy
Modes of preservation:body,concretion
Size of fossils:macrofossils
Collection methods and comments
Collection methods:selective quarrying,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Collection method comments: Location now unaccessible (underwater). 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.
Taxonomic list comments:Exhaustive for gastropods.
Metadata
Also known as:USGS 2685; field #19
Database number:42535
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2004-08-01 16:35:54 Last modified:2025-02-22 15:12:02
Access level:the public Released:2004-08-01 16:35:54
Creative Commons license:CC0
Reference information

Primary reference:
11306. 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]

Secondary references:

13235 W. P. Woodring. 1973. Geology and paleontology of canal zone and adjoing parts of Panama: Description of Tertiary mollusks (additions to gastropods, scaphopods, pelecypods: Nuculidae to Malleidae). United States Geological Survey Professional Paper 306(E):453-539 [A. Miller/A. Hendy/A. Hendy]
13359 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]