San Luis Potosi, riverbed Arroyo de la Atarjea (Cretaceous of Mexico)

Where: Mexico (22.1° N, 101.0° W: paleocoordinates 28.6° N, 81.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Cardenas Formation, Maastrichtian (72.1 - 66.0 Ma)

• The Upper Cretaceous Cardenas Formation is a mixed clastic/

•carbonate sequence, and is best exposed north of the city of Cardenas

•in east-central Mexico (state San Luis Potosı´) (Fig. 1). Tectonically,

•the Cardenas Formation is part of the fold and thrust

•belt of the Sierra Madre Oriental. The section is exposed in a riverbed called Arroyo de la Atarjea, which is located approximately 2 km north of Cardenas

•The section is 1,200 m thick. The Tabaco Formation overlie the Cardenas Formation.

Environment/lithology: shallow subtidal; sandstone and poorly lithified siltstone

• The Upper Cretaceous Cardenas Formation is a mixed clastic/

•carbonate sequence, and is best exposed north of the city of Cardenas

•in east-central Mexico (state San Luis Potosı´) (Fig. 1). Tectonically,

•the Cardenas Formation is part of the fold and thrust

•belt of the Sierra Madre Oriental. The section is exposed in a riverbed called Arroyo de la Atarjea, which is located approximately 2 km north of Cardenas

•The section is 1,200 m thick. The Tabaco Formation overlie the Cardenas Formation.

• Lithologies consist of marls, siltstones, and arenites, as well as sparse

•conglomerates. In addition, the upper and lower members are

•characterized by carbonate intervals, which bear rudist assemblages

•in the lower member and rudist-dominated, mixed coralrudist

•and coral-dominated assemblages in the upper member

Size class: macrofossils

Primary reference: R. C. Baron-Szabo, A. Schafhauser, S. Götz and W. Stinnesbeck. 2006. Scleractinian corals from the Cardenas Formation (Maastrichtian), San Luis Potosi, Mexico. Journal of Paleontology 80(6):1033-1046 [W. Kiessling/M. Krause]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 138913: authorized by Wolfgang Kiessling, entered by Mihaela Krause on 02.02.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Anthozoa
 Scleractinia - Brachyphylliidae
Dermosmiliopsis orbignyi Alloiteau 1952 stony coral
 Scleractinia - Actinacididae
Actinacis haueri Reuss 1854 stony coral
"Actinacis parvistella" = Actinacis martiniana d’Orbigny 1850 stony coral
Actinhelia elegans Goldfuss 1826 stony coral
 Scleractinia - Poritidae
Goniopora sp. Blainville 1830 stony coral
 Scleractinia - Agariciidae
Cyathoseris formosa d'Achiardi 1875 stony coral
Trochoseris aperta Duncan 1864 stony coral
 Scleractinia - Siderastreidae
Siderastrea vancouverensis Vaughan 1923 stony coral
Siderastrea adkinsi Wells 1934 stony coral
 Scleractinia - Haplaraeidae
Meandrophyllia oceani de Fromentel 1877 stony coral
 Scleractinia - Faviidae
Multicolumnastraea cyathiformis Duncan 1865 stony coral
Antiguastrea cellulosa Duncan 1863 stony coral
Dictuophyllia conferticostata Vaughan 1899 stony coral
Cladocora cracilis stony coral
Cladocora jamaicaensis Vaughan 1899 stony coral
 Scleractinia - Placocoeniidae
Placocoenia major Felix 1903 stony coral