Macarao Formation (Eocene of Colombia)

Where: Colombia (11.9° N, 71.3° W: paleocoordinates 9.6° N, 64.7° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

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

• STRATIGRAPHIC RELATIONS: From the Macarao Fm, which unconformably overlies the Guaralamai Fm (Campanian) and is unconformably overlain by the Sillamana Fm (Oligocene). AGE: Late Eocene, on the basis of only poor macrofossil biostratigraphy. STRATIGRAPHIC POSITION: From transition zone between middle 140 m thick sandstone member and upper 80 m thick limestone member.

• formation-level stratigraphic resolution

Environment/lithology: marine; lithified, argillaceous, calcareous sandstone

• SPECIFIC LITHOLOGY: Dark colored, sandy limy and argillaceous facies. LITHIFICATION:

Size class: macrofossils

Preservation: replaced with calcite

Collected by Thomas; reposited in the USNM

Collection methods: surface (in situ),

• COLLECTOR. D. Thomas, c. 1970. REPOSITORY: Not stated in text. Non-type specimens observed in USNM stratigraphic collections by A. Hendy (1/2011).

Primary reference: D. J. Thomas. 1972. The Tertiary geology and systematic paleontology (phylum Mollusca) of the Guajira Peninsula, Colombia, South America. PhD dissertation. State University of New York at Binghampton 1-138 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 103544: authorized by Austin Hendy, entered by Austin Hendy on 29.01.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive list for macrofossils. NOMENCLATURE: Authoritative publication, with somewhat antiquated nomenclature. Nomenclature never published. New species have been re-identified by enterer (A. Hendy, 2/2011).
Textulariina
 Textulariacea - Textulariidae
Textularia sp. Defrance 1824
Lagenina
 Nodosariacea - Nodosariidae
Robulus sp. Montfort 1808
Bivalvia
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Carditida - Carditidae
Glyptoactis carmenensis Clark and Durham 1946 clam
 Cardiida - Veneridae
Pitar (Lamelliconcha) sp. Dall 1902 venus clam
 Cardiida - Cardiidae
Cardium sp. Linnaeus 1758 cockle
Gastropoda
 Sorbeoconcha - Turritellidae
Turritella chira Olsson 1928 turret shell
Gymnolaemata
 Cheilostomata -
 Cheilostomata - Calloporidae
 Cheilostomata - Electrinidae
Membranipora sp. Blainville 1834
Echinoidea
 Cassiduloida - Cassidulidae
Cassidulus sp. Lamarck 1801 sea urchin