Quebrada El Mamon (Miocene of Venezuela)

Also known as Urumaco

Where: Falcon, Venezuela (11.2° N, 70.3° W: paleocoordinates 11.0° N, 68.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Middle Member (Urumaco Formation), Late/Upper Miocene (11.6 - 5.3 Ma)

• The geological units from which the specimens were obtained are the middle and upper members of the Urumaco Formation of Venezuela. These units have been recently summarized in the Léxico estratigráfico de Venezuela (1997).

• member-level stratigraphic resolution

Environment/lithology: fluvial-deltaic; brown, gray claystone and sandstone

• The paleoenvironments are interpreted as inner sub-littoral and coastal lagoon enviroments with riverine and estuarine influence (Díaz de Gamero, 1996).
• The middle member of the Urumaco Formation consists of claystone and sand. The gray claystone is microfossiliferous, and the brown claystone contains vertebrate remains such as reptiles, mammals, marine and freshwater fish, and also coprolites and wood (Díaz de Gamero & Linares, 1989). The limestone changes from conchiferous sandstones to consolidated coquina limestone. In the lower half of this middle member, an abundant and diverse marine mollusk fauna exists in a sandy matrix. This matrix also contains elasmobranch teeth and teleostean otoliths.

Size class: macrofossils

Primary reference: J. G. Lundberg and O. A. Aguilera. 2003. The late Miocene Phractocephalus catfish (Siluriformes: Pimelodidae) from Urumaco, Venezuela: additional specimens and reinterpretation as a distinct species. Neotropical Ichthyology 1(2):97-109 [C. Jaramillo/G. Ballen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 136778: authorized by Carlos Jaramillo, entered by Gustavo Ballen on 04.12.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

 Siluriformes - Pimelodidae
Phractocephalus nassi Lundberg and Aguilera 2003 cajaro
UNEFM-PF-0311 (non-type)