Quebrada La Rosa (Jurassic of Colombia)

Where: Meta, Colombia (4.1° N, 73.7° W: paleocoordinates 4.2° N, 41.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Upper Member (Brechas de Buenavista Formation), Late/Upper Tithonian (150.8 - 145.0 Ma)

• member-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, black, sandy, calcareous shale and lithified, fine-grained sandstone

• This sequence was deposited in a shallow marine environment, surrounded by a rocky and steep coast.
• The member comprises marine rudites (breccias), feldespatic sandstones and siltstones. The fossils occurs on black shales and fine-grained sandstones. The shales have planar or wavy stratification. The sandstones show lenticular or wavy bedding.

Size class: macrofossils

• Bivalves, plants and fish remains are common. Only ammonites were studied.

Preservation: mold/impression

Collected in 1983-1984

Collection methods: quarrying,

Primary reference: J. Dorado Galindo. 1990. Contribucion al Conocimiento de la Estratigrafia de la Formacion Brechas de Buenavista (Limite Jurasico-Cretacico). Region Noroeste de Villavicencio (Meta). Geologia Colombiana (17)7-39 [A. Rojas/A. Rojas]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 191974: authorized by Alexis Rojas, entered by Alexis Rojas on 26.02.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Himalayitidae
? Dickersonia sp., "Berriasella aff. pastorei" = Corongoceras alternans
"Berriasella aff. pastorei" = Corongoceras alternans Gerth 1925 ammonite