Location 42, Gatun Lake area (Bohio Formation) - Woodring (1957) (Eocene of Panama)

Also known as USGS 17692; field #149

Where: Panama (9.2° N, 79.9° W: paleocoordinates 6.8° N, 77.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• Listed as "basal 3 m of section". 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".

• bed-level stratigraphic resolution

Environment/lithology: coastal; sandy siltstone

• A marine tongue within a overall non-marine lithostratigraphic unit.
• Listed as "sandy siltstone". 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.

Size classes: macrofossils, microfossils

Reposited in the USNM

Collection methods: quarrying,

• Collected by Thomson and Woodring (1949). 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.

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 42528: authorized by Austin Hendy, entered by Austin Hendy on 01.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropods. Includes forams (identified by Cole, 1953)
 Nummulitacea - Nummulitidae
"Operculinoides jacksonensis" = Nummulites, "Operculinoides kugleri" = Nummulites, "Operculinoides trinitatensis" = Nummulites
"Operculinoides jacksonensis" = Nummulites
"Operculinoides kugleri" = Nummulites
"Operculinoides trinitatensis" = Nummulites
 Orbitoidacea - Lepidocyclinidae
 Pholadida - Corbulidae
Caryocorbula sp.4 Gardner 1926 clam
Varicorbula baea4 Woodring 1982 clam
 Cardiida - Mactridae
Eopapyrina darienensis4 Dall 1898 clam
? Mulinia sp.4 Gray 1837 clam
 Cardiida - Veneridae
Costacallista gabrielensis4 Clark and Durham 1946 venus clam
Lamelliconcha hillii4 Dall 1895 venus clam
 Cardiida - Tellinidae
Tellina (Eurytellina) alincia4 Woodring 1982 tellin clam
 Lucinida - Lucinidae
Lucinisca protista4 Woodring 1982 clam
 Protobranchia - Nuculanidae
Saccella phlyctaena3 Woodring 1973 pointed nut clam
 Cephalaspidea - Retusidae
Volvulella (Volvulella) sp.2 Newton 1891 snail
 Architaenioglossa - Ampullinidae
Globularia (? Ampulella) nana Woodring 1957 snail
 Neogastropoda - Olividae
Olividae indet.2 Latreille 1825 olive snail
 Neogastropoda - Columbellidae
Mitrella sp.2 Risso 1826 snail
 Neogastropoda - Nassariidae
"? Tritiaria sp." = Nassarius (Tritiaria)2
"? Tritiaria sp." = Nassarius (Tritiaria)2 Conrad 1865 snail
 Vanikoroidea - Eulimidae
 Naticoidea - Naticidae
Natica (? Natica) sp. Scopoli 1777 moon snail
Tectonatica sp. Sacco 1890 moon snail
 Sorbeoconcha - Turritellidae
Turritella cf. caleta Olsson 1931 turret shell
 Sorbeoconcha - Cerithiidae
Cerithium sp.1 Bruguière 1789 cerith snail
 Gadilida - Gadilidae
"Cadulus (Gadilopsis) sp." = Gadilopsis3
"Cadulus (Gadilopsis) sp." = Gadilopsis3 Woodring 1925 tusk shell