Location 40a, Gatun Lake area (Bohio Formation) - Woodring (1957) (Eocene of Panama)

Also known as Lot 1 (Hill, 1895); USGS 2683; field #18

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 and pebbly conglomerate

• A marine tongue within a overall non-marine lithostratigraphic unit.
• 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,

• 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 42534: authorized by Austin Hendy, entered by Austin Hendy on 01.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for gastropods.
 Pholadida - Corbulidae
Caryocorbula phruda4 Woodring 1982 clam
 Cardiida - Mactridae
Ovamactra cyma4 Woodring 1982 clam
Eopapyrina darienensis4 Dall 1898 clam
? Mulinia sp.4 Gray 1837 clam
 Cardiida - Veneridae
Pitar (? Pitar) yasila4 Olsson 1930 venus clam
Costacallista gabrielensis4 Clark and Durham 1946 venus clam
Lamelliconcha hillii4 Dall 1895 venus clam
 Cardiida - Tellinidae
Strigilla (Strigilla) protera4 Woodring 1982 tellin clam
Tellina (Eurytellina) alincia4 Woodring 1982 tellin clam
 Cardiida - Psammobiidae
Gari (Gobraeus) listrota4 Woodring 1982 clam
Subspecies: Gari (Gobraeus) listrota listrota
 Cardiida - Cardiidae
? Schedocardia gatunensis4 Dall 1900 cockle
 Ptenoglossa - Epitoniidae
? Scalina sp.1 Conrad 1865 wentletrap
 Opisthobranchia - Cylichnidae
 Architaenioglossa - Ampullinidae
"Globularia (Ampulella) sp." = Ampullina
"Globularia (Ampulella) sp." = Ampullina Férussac 1822 snail
 Neogastropoda - Columbellidae
Mitrella sp.2 Risso 1826 snail
 Neogastropoda - Buccinidae
Buccinidae indet.2 Rafinesque 1815 true whelk
 Neogastropoda - Fasciolariidae
Glyptostyla panamensis2 Dall 1892 snail
 Neogastropoda - Harpidae
 Neogastropoda - Turridae
Turridae indet.2 Swainson 1840 turrid
 Ficoidea - Ficidae
Ficus cf. mississippiensis1 Conrad 1848 fig shell
 Vanikoroidea - Eulimidae
Niso (Niso) umbilicata2 Lea 1833 snail
 Naticoidea - Naticidae
Sinum sp. Röding 1798 moon snail
"? Pachycrommium proinum" = Euspirocrommium proinum Woodring 1957 moon snail
? Polinices sp. Monfort 1810 moon snail
Neverita (Glossaulax) bolivarensis Clark and Durham 1946 moon snail
Subspecies: Neverita (Glossaulax) bolivarensis tapina
 Calyptraeoidea - Calyptraeidae
Calyptraea sp. Lamarck 1799 slipper shell
 Sorbeoconcha - Turritellidae
Turritella adela turret shell
Turritella cf. caleta Olsson 1931 turret shell
 Architectonicoidea - Architectonicidae
Architectonica sp.1 Röding 1798 sundial
"Architectonica (Stellaxis) aff. alveata" = Architectonica (Stellaxis) alveatum1 Conrad 1833 sundial
Architectonica cf. fungina1 Conrad 1833 sundial
 Turbinoidea - Phasianellidae
Tricolia calypta Woodring 1957 snail
 Dentaliida - Dentaliidae
Dentalium sp.3 Linnaeus 1758 tusk shell