Location 41b, Gatun Lake area (Bohio Formation) - Woodring (1957) (Eocene of Panama)

Also known as USGS 18839; field #209

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)

• 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; poorly lithified, concretionary, tuffaceous, calcareous sandstone

• A marine tongue within a overall non-marine lithostratigraphic unit.
• Listed as "calcareous concretion in soft sandstone". 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 class: macrofossils

Preservation: concretion

Reposited in the USNM

Collection methods: quarrying,

• Collected by Woodring (1954). 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 42531: authorized by Austin Hendy, entered by Austin Hendy on 01.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropods.
unclassified
  -
Bivalvia
 Nuculanida - Nuculanidae
Saccella phlyctaena3 Woodring 1973 pointed nut clam
 Arcida - Arcidae
Anadara (Rasia) carmenensis3 Clark and Durham 1946 ark
 Cardiida - Cardiidae
Microcardium microtatum4 Woodring 1982 cockle
? Schedocardia gatunensis4 Dall 1900 cockle
Subspecies: Schedocardia gatunensis gatunensis
 Cardiida - Semelidae
Semele sp.4 Schumacher 1817 clam
Ervilia sp.4 Turton 1822 clam
 Cardiida - Tellinidae
Tellina (Arcopagia) acares4 Woodring 1982 tellin clam
Strigilla (Strigilla) protera4 Woodring 1982 tellin clam
 Cardiida - Psammobiidae
Gari (Gobraeus) listrota4 Woodring 1982 clam
 Cardiida - Mactridae
Ovamactra cyma4 Woodring 1982 clam
Eopapyrina darienensis4 Dall 1898 clam
 Cardiida - Veneridae
Lamelliconcha hillii4 Dall 1895 venus clam
Scaphopoda
 Gadilida - Gadilidae
"Cadulus (Gadilopsis) dolichus" = Gadilopsis3
"Cadulus (Gadilopsis) dolichus" = Gadilopsis3 tusk shell
 Dentaliida - Dentaliidae
Dentalium (? Laevidentalium) sp.3 Cossmann 1888 tusk shell
Gastropoda
 Opisthobranchia - Cylichnidae
Scaphander (Scaphander) cf. jacksonensis2 Harris and Palmer 1947 snail
 Opisthobranchia - Retusidae
 Neotaenioglossa - Calyptraeidae
Calyptraea sp. Lamarck 1799 slipper shell
 Architaenioglossa - Ampullinidae
"Globularia (Ampulella) sp." = Ampullina
"Globularia (Ampulella) sp." = Ampullina Férussac 1822 snail
 Neogastropoda - Marginellidae
? Volvarinella sp.3 Habe 1951 margin shell
 Neogastropoda - Nassariidae
"? Tritiaria sp." = Nassarius (Tritiaria)2
"? Tritiaria sp." = Nassarius (Tritiaria)2 Conrad 1865 snail
 Neogastropoda - Buccinidae
Buccinidae indet.2 Rafinesque 1815 true whelk
 Sorbeoconcha - Naticidae
Natica (? Natica) sp. Scopoli 1777 moon snail
"? Pachycrommium proinum" = Euspirocrommium proinum Woodring 1957 moon snail
Neverita (Glossaulax) bolivarensis Clark and Durham 1946 moon snail
Subspecies: Neverita (Glossaulax) bolivarensis tapina
? Polinices sp. Monfort 1810 moon snail
 Cerithioidea - Turritellidae
Turritella adela turret shell
Turritella cf. caleta Olsson 1931 turret shell
 Cerithioidea - Cerithiidae
Cerithium sp.1 Bruguière 1789 cerith snail
Pasithea
  -
"Niso (Niso) umbilicata" = Pasithea umbilicata2
"Niso (Niso) umbilicata" = Pasithea umbilicata2 Lea 1833