Gateway to the Paleobiology Database
Río Negro [Apón Fm] (Cretaceous of Venezuela)

Where: Venezuela (10.0° N, 72.5° W: paleocoordinates 6.8° N, 41.9° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Late/Upper Aptian (122.5 - 112.6 Ma)

• STRATIGRAPHIC RELATIONS: From the Apón Fm, whcih is conformable and gradational with the underlying Río Negro Fm, overlies in other places Triassic-pre-Cambrian beds, overlain by the Aguadiente Fm. AGE: Late Aptian-Middle Albian; placed by enterer in the Late Aptian on the basis of mention of key ammonite horizon dated as such. STRATIGRAPHIC POSITION: From multiple beds in the formation.

• formation-level stratigraphic resolution

Environment/lithology: lithified limestone and lithified, gray, calcareous shale

• ENVIRONMENT: Shallow marine, occasionally deeper as indicated by development of shale.
• SPECIFIC LITHOLOGY: Thick-bedded limestone interbedded with subordinate amounts of dark gray calcareous shale and sandy shale. LITHIFICATION: Lithified, on the basis of facies description.

Size class: macrofossils

Collected by Dusenbury

Collection methods: surface (in situ),

• COLLECTOR: A. N. Dusenbury (unpublished). REPOSITORY: Not stated in text.

Primary reference: F. A. Sutton. 1946. Geology of Maracaibo Basin, Venezuela: part 1. American Association of Petroleum Geologists Bulletin 30(10):1621-1738 [A. Hendy/A. Hendy/P. Wagner] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 94209: authorized by Austin Hendy, entered by Austin Hendy on 11.02.2010

Creative Commons license: CC BY (attribution)