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

Also known as USGS 17716; field #148

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; concretionary, tuffaceous, silty, calcareous sandstone

• A marine tongue within a overall non-marine lithostratigraphic unit.
• Listed as "loose calcareous concretions at waters edge". 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 Thomson and Woodring (1940). 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 42533: authorized by Austin Hendy, entered by Austin Hendy on 01.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropods.
unclassified
  -
Gastropoda
 Cerithioidea - Turritellidae
Turritella adela turret shell
Turritella cf. caleta Olsson 1931 turret shell
 Architaenioglossa - Ampullinidae
"Globularia (Ampulella) sp." = Ampullina, Globularia (? Ampulella) nana
"Globularia (Ampulella) sp." = Ampullina FĂ©russac 1822 snail
Globularia (? Ampulella) nana Woodring 1957 snail
 Neogastropoda - Marginellidae
? Volvarinella sp.3 Habe 1951 margin shell
 Sorbeoconcha - Naticidae
? Polinices sp. Monfort 1810 moon snail
? Neverita sp. Risso 1826 moon snail
Neverita (Glossaulax) bolivarensis Clark and Durham 1946 moon snail
Subspecies: Neverita (Glossaulax) bolivarensis tapina
"? Pachycrommium proinum" = Euspirocrommium proinum Woodring 1957 moon snail
 Heterostropha - Architectonicidae
"Architectonica (Stellaxis) aff. alveata" = Architectonica (Stellaxis) alveatum1
"Architectonica (Stellaxis) aff. alveata" = Architectonica (Stellaxis) alveatum1 Conrad 1833 sundial
 Opisthobranchia - Cylichnidae
Scaphander (Scaphander) jacksonensis2 Harris and Palmer 1947 snail
Bivalvia
 Pholadida - Corbulidae
Caryocorbula phruda4 Woodring 1982 clam
 Cardiida - Veneridae
Costacallista gabrielensis4 Clark and Durham 1946 venus clam
Lamelliconcha hillii4 Dall 1895 venus clam
? Parastarte sp.4 Conrad 1862 venus clam
 Cardiida - Mactridae
Ovamactra cyma4 Woodring 1982 clam
Eopapyrina darienensis4 Dall 1898 clam
 Cardiida - Cardiidae
? Schedocardia gatunensis4 Dall 1900 cockle
Subspecies: Schedocardia gatunensis gatunensis
 Cardiida - Tellinidae
Strigilla (Strigilla) protera4 Woodring 1982 tellin clam
 Cardiida - Psammobiidae
Gari (Gobraeus) listrota4 Woodring 1982 clam
Subspecies: Gari (Gobraeus) listrota listrota
 Carditida - Carditidae
 Nuculanida - Nuculanidae
Saccella phlyctaena3 Woodring 1973 pointed nut clam
~
 Life -
"Niso (Niso) umbilicata" = Pasithea umbilicata2
"Niso (Niso) umbilicata" = Pasithea umbilicata2 Lea 1833