Cerro Dorotea (Paleocene of Argentina)

Where: Santa Cruz, Argentina (51.6° S, 72.3° W: paleocoordinates 54.1° S, 62.8° W)

When: Cerro Dorotea Formation, Selandian (61.6 - 59.2 Ma)

• No comments about stratigraphy.

•More precise dating sourced from zircon ages in Fosdick et al. 2015. Formation assumed to be Cerro Dorotea.

•"Cerro Dorotea Formation: Detrital zircon geochronology from three stratigraphic horizons (225 grains) within the mapped Cerro Dorotea Fm. near Cerro Castillo reveals an upward decreasing youngest age peaks, major age populations between 60-66 Ma, 74-115 Ma, 123-160 Ma, 473-630 Ma, 960-1130 Ma, and lesser numbers of Proterozoic and lower Paleozoic ages (Fig. 2). Youngest detrital age populations yield MDA estimates of 61.9 ± 0.3 Ma (n = 4) and 60.5 ± 0.8 (n = 3) for the uppermost samples, collected from thick-bedded, trough cross-bedded tan-yellow sandstone and orange brown sandstone with interbedded siltstone and coal-bearing mudstone, respectively."

Environment/lithology: basinal (); sandstone and mudstone

• See Bernhardt et al. 2012

Size class: macrofossils

Collection methods: bulk,

Primary reference: O. Wilckens. 1907. Die Lamellibrachiaten, Gastropoden ect. aus der oberen Kreide Südpatagoniens. Berichte der Naturforschenden Gesellschaft zu Freiburg, Breisgau 15:97-166 [M. Clapham/J. Fearon/J. Fearon]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 235520: authorized by Matthew Clapham, entered by J Fearon on 15.07.2024

Creative Commons license: CC BY (attribution)

Taxonomic list

Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp. Linnaeus 1758 tusk shell
Bivalvia
 Nuculanida - Malletiidae
Malletia rudis Wilckens 1907 clam
 Carditida - Astartidae
Astarte venatorum Wilckens 1907 clam
 Hiatellida - Hiatellidae
"Panopaea sp." = Panopea
"Panopaea sp." = Panopea Menard 1807 clam
Gastropoda
 Sorbeoconcha - Aporrhaidae
Aporrhais gregaria Wilckens 1907 snail