ammonites
banner
Gateway to the Paleobiology Database
Cabeza Blanca ( of Argentina)

Also known as Loomis Locality

Where: Chubut, Argentina (45.2° S, 67.5° W: paleocoordinates 46.4° S, 60.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Sarmiento Formation, Deseadan (29.0 - 21.0 Ma)

• According to the most recent geochronological calibrations at Gran Barranca, Deseadan mammal assemblages could be as old as 29.2 Ma and as young as 26.3 Ma (Ré et al. 2010: 59243), a timespan corresponding to the late Oligocene.

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; brown, sandy shale and concretionary, yellow, sandy claystone

• "The material varies from brown sandy clay shales to yellow sandy clay with concretions, and is capped with a varying laer of greenish sand, which, in some places, is coarse and irregular, in others fine and uniform, and in still other places is mixed with considerable quantities of volcanic ash. In it are many mud balls..."

Size class: macrofossils

Primary reference: F. Ameghino. 1897. Mammiféres crétacés de l’Argentine (Deuxième contribution à la connaissance de la fauna mammalogique de couches à Pyrotherium) [Cretaceous mammals of Argentina (second contribution to the knowledge of the mammalian fauna of the Pyrotherium Beds)]. Boletin Instituto Geografico Argentino 18(4–9):406-521 [M. Uhen/M. Uhen/M. Carrano] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 14211: authorized by John Alroy, entered by Jill Wertheim on 23.05.2002, edited by Juan Carrillo, Jelle Zijlstra, Terri Cleary, Philip Mannion and Evangelos Vlachos

Creative Commons license: CC BY (attribution)