For other uses, see Santa Cruz Formation (disambiguation).
Santa Cruz Formation
Stratigraphic range: Burdigalian-Langhian (Santacrucian-Friasian) ~18–15.2 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
↓
Type
Geological formation
Sub-units
Estancia La Costa Member, Estancia La Angelina Member (coastal section)
Underlies
Cerro Boleadoras Formation
Overlies
Monte Léon Formation
Thickness
Over 295 metres
Lithology
Primary
Tuff, claystone, mudstone (Estancia La Costa Member)
Claystone, mudstone, sandstone (Estancia La Angelina Member)
Location
Country
Argentina, Chile
Extent
Austral Basin
Type section
Named by
Furque & Camacho
Location
near Lago Argentino
Year defined
1972
Santa Cruz Province in Argentina, where the majority of the formation of exposed
The Santa Cruz Formation is a geological formation in the Magallanes/Austral Basin in southern Patagonia in Argentina and in adjacent areas of Chile. It dates to the late Early Miocene epoch, and is contemporaneous with eponymous Santacrucian SALMA.[1][2] The formation extends from the Andes to the Atlantic coast. In its coastal section it is divided into two members, the lower, fossil rich Estancia La Costa Member, which has a lithology predominantly consisting of tuffaceous deposits and fine grained sedimentary claystone and mudstone, and the upper fossil-poor Estancia La Angelina Member, which consists of sedimentary rock, primarily claystone, mudstone, and sandstone. The environment of deposition is interpreted to have been mostly fluvial, with the lowermost part of the Estancia La Costa Member being transitional between fluvial and marine conditions. The environment of the Estancia La Costa Member is thought to have been relatively warm and humid, but likely became somewhat cooler and drier towards the end of the sequence.[1] The Santa Cruz Formation is known for its abundance of South American native ungulates (astrapotheres, litopterns, notoungulates),[3] as well as an abundance of rodents, xenarthrans (armadillos, sloths, anteaters), and metatherians.
^ abMatheos, Sergio D.; Raigemborn, M. Sol (2012-10-11). Vizcaíno, Sergio F.; Kay, Richard F.; Bargo, M. Susana (eds.). Sedimentology and paleoenvironment of the Santa Cruz Formation (1 ed.). Cambridge University Press. pp. 59–82. doi:10.1017/cbo9780511667381.005. ISBN 978-0-511-66738-1. Retrieved 2022-11-06. {{cite book}}: |work= ignored (help)
^Cuitiño, José I.; Vizcaíno, Sergio F.; Bargo, M. Susana; Aramendía, Inés (2019-05-31). "Sedimentology and fossil vertebrates of the Santa Cruz Formation (early Miocene) in Lago Posadas, southwestern Patagonia, Argentina". Andean Geology. 46 (2): 383–420. doi:10.5027/andgeoV46n2-3128. hdl:11336/96343. ISSN 0718-7106.
^Cassini, Guillermo H.; Cerdeño, Esperanza; Villafañe, Amalia L.; Muñoz, Nahuel A. (2012). "Early Miocene Paleobiology in Patagonia: High-Latitude Paleocommunities of the Santa Cruz Formation". In Bargo, M. Susana; Kay, Richard F.; Vizcaíno, Sergio F. (eds.). Paleobiology of Santacrucian native ungulates (Meridiungulata: Astrapotheria, Litopterna and Notoungulata). Cambridge: Cambridge University Press. pp. 243–286. ISBN 978-0-521-19461-7.
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