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Location 42e, Gatun Lake area [Bohio Fm] (Oligocene of Panama)

Also known as USGS 18835; field #205

Where: Panama (9.2° N, 79.9° W: paleocoordinates 7.7° N, 77.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Bohio Formation, Late/Upper Oligocene (28.4 - 23.0 Ma)

• The Bohio Formation is characterized by the presence of poorly sorted debris, mostly basaltic: very coarse debris in the form of boulders and cobbles, and finer debris formings beds of sandstone, and the matrix of conglomerate. The facies are non-mrine, but marine fossils are found in thin units in the upper part of the formation, in algal limestone and in both poorly sorted and fairly well sorted subgraywacke. The Bohio Formation overlies the Gatuncillo Formation conformably in most areas, although may lap onto the Gauncillo Formation or basement. The thickness of the formation is about 75 metres to as much as 450 metres. Smaller foraminifera from the basal part of the formation yielded a early Oligocene age. The upper part of the formation, from which the collections are derived yields larger foraminifera of late Oligocene age.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, medium-grained, calcareous wackestone

• No paleoenvironmentald data reported, but given that these collections originate from marine tongues/wedges, they are likely to be shallow water.
• Listed as "calcareous, medium-grained subgreywacke". Algal limestone and in both poorly sorted and fairly well sorted subgraywacke.

Size class: macrofossils

Collected by Woodring in 1954; reposited in the USNM

Collection methods: surface (in situ),

• COLLECTOR: Woodring (1954). REPOSITORY: USNM.

Primary reference: 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] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 92983: authorized by Austin Hendy, entered by Austin Hendy on 20.12.2009

Creative Commons license: CC BY (attribution)