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Geologic age
The Riochican (
Spanish : Riochiquense ) age is a period of
geologic time (57.0–54.0
Ma ) within the
Paleocene and
Eocene epochs of the
Paleogene , used more specifically within the
South American land mammal ages (SALMA). It follows the
Peligran and precedes the
Itaboraian age.
[1]
Etymology
This age is named after the
Río Chico Group of the
Golfo San Jorge Basin .
Formations
Locations of Riochican formations
Fossils
Group
Fossils
Formation
Notes
Mammals
Etayoa bacatensis
Bogotá
Brandmayria simpsoni ,
Ernestokokenia chaishoer ,
E. ?yirunhor ,
Isotemnus cf. primitivus ,
Palangania brandmayri ,
Anisolambda sp. ,
Henricosbornia sp. ,
Josepholeidya sp. ,
Notopithecus sp. ,
Othnielmarshia sp. ,
Polydolops winecage ,
Ricardolydekkeria sp. ,
Trigonostylops sp. ,
Victorlemoinea sp. ,
?Eohyrax sp. ,
?Nemolestes sp. ,
?Notostylops sp. ,
?Pleurostylodon sp. ,
?Polystylops sp. ,
?Postpithecus sp. ,
Dasypodidae indet.
Koluel Kaike
Eoastrapostylops riolorense ,
Notonychops powelli ,
Satshatemnus bonapartei
Río Loro
Reptiles & amphibians
Testudines indet.
Koluel Kaike
Pelomedusoides sp.
Maíz Gordo
Lorosuchus nodosus ,
Pelomedusoides cf. argentinensis
Río Loro
Fishes
?Cyprinodon primulus
Maíz Gordo
Insects
Anthicus sepultulus ,
Austrolibellula noroestenia ,
Carabites harringtoni ,
Celinapterix bellissima ,
Cryptophagus sunchalensis ,
Curculionites harringtoni ,
C. jujuyensis ,
C. magdalinus ,
C. parastictus ,
C. stebingeri ,
C. sunchalicus ,
C. wielandi ,
Curviarculia delicata ,
C. lamasi ,
Gryllites vocalis ,
Jujusia maizgorda ,
Latibasalia elongata ,
L. quispeae ,
Lebia harrelli ,
Ormenis devincta ,
Otiorhynchites aterrimus ,
O. crassus ,
Palaeomacromia multicellulata ,
Palaeophya argentina ,
Promegalestes singularis ,
Tenebrionites inclinans ,
Thyridates novokschonovi ,
?Anthonomus sunchalensis ,
?Corizus deflagratus ,
?Cossonus devoratus ,
?Haruspex defectus ,
?Molanna derosa ,
?Podabrus santaritensis ,
?Trichodes stebingeri
Maíz Gordo
Flora
Banaraphyllum ovatum ,
Cissites patagonica ,
Cryptocaryoides mariasantisimensis ,
Dryophyllum australis ,
Fagophyllum duseni ,
Laurophyllum chubutensis ,
Laurophyllum piatnitzkyi ,
Myrica premira ,
Nothofagidites visserensis ,
Paranymphaea aristolochiaformis ,
Sterculia acuminataloba ,
Zizyphus chubutensis
Río Chico
Palmoxylon patagonicum
Bororó
Cordioxylon prototrichotoma
Peñas Coloradas
Palmoxylon patagonicum
Salamanca
References
^
Paleo Database: Riochican
^ Raigemborn et al., 2010, p.240
^ Bayona et al., 2012, p.103
^ Scarfati et al., 2009, p.36
^ Chacaltana et al., 2015, p.2
^ Castro Medina, 2010, p.53
^ Raigemborn et al., 2010, p.251
^ Raigemborn et al., 2010, p.249
^ Narváez, 2009, p.24
^ Sánchez & Marquillas, 2010, p.389
^ Quispe Alcalá, 2010, p.21
^ Gelfo & Goin, 2011
^
a
b Clyde et al., 2014, p.303
^ Pol & Powell, 2011, S9
^
Quebrada Mochuelo at
Fossilworks .org
^
Bajo Palangana at
Fossilworks .org
^
Bajo de la Palangana at
Fossilworks .org
^
a
b
Cerro Redondo at
Fossilworks .org
^
Aguas Chiquitas at
Fossilworks .org
^
Quebrada del Puesto at
Fossilworks .org
^
El Cadillal Lake at
Fossilworks .org
^
a
b
Sierra Santa Bárbara East at
Fossilworks .org
^
Quebrada El Gritón at
Fossilworks .org
^
La Cuesta Azul at
Fossilworks .org
^
El Fuerte at
Fossilworks .org
^
La Mendieta at
Fossilworks .org
^
El Garabatal at
Fossilworks .org
^
Sunchal at
Fossilworks .org
^
Sunchal Station 3 at
Fossilworks .org
^
Cerro Funes at
Fossilworks .org
^
Puerto Visser at
Fossilworks .org
^
a
b
Palmoxylon at
Fossilworks .org
^
Puerto Visser at
Fossilworks .org
Bibliography
Bogotá Formation
Bororó Formation
Chota Formation
Las Flores Formation
Koluel Kaike Formation
Maíz Gordo Formation
Mealla Formation
Mogollón Formation
Muñani Formation
Peñas Coloradas Formation
Clyde, William C.; Peter Wilf; Ari Iglesias; Rudy L. Slingerland; Peter K. Bijl; Timothy J. Bralower; Henk Brinkhuis; Emily Comer, and Brian T. Huber, Mauricio Ibañez Mejia, Brian R. Jicha, J. Marcelo Krause, Jonathan D. Schueth, Bradley S. Singer, María Sol Raigemborn, Mark D. Schmitz, Appy Sluijs, and María del Carmen Zamaloa. 2014.
New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations .
GSA Bulletin 126. 289–306. Accessed 2017-08-15.
Raigemborn, María Sol; Javier M. Krause; Eduardo Bellosi, and Sergio D. Matheos. 2010.
Redefinición estratigráfica del Grupo Río Chico (Paleógeno inferior), en el norte de la Cuenca del Golfo San Jorge, Chubut .
Revista de la Asociación Geológica Argentina 67. 239–256. Accessed 2017-08-15.
Río Loro Formation
Salamanca Formation
Apesteguia, Sebastián; Raúl O. Gómez, and Guillermo W. Rougier. 2014.
The youngest South American rhynchocephalian, a survivor of the K/Pg extinction .
Proceedings of the Royal Society B: Biological Sciences 281. 20140811. Accessed 2019-03-03.
Bonaparte, J.F., and J. Morales. 1997.
Un primitico Notonychopidae (Litopterna) del paleoceno inferior de Punta Peligro, Chubut, Argentina . Estudios Geológicos 53. 263–274. Accessed 2018-10-01.
Clyde, William C.; Peter Wilf; Ari Iglesias; Rudy L. Slingerland; Timothy Barnum; Peter K. Bijl; Timothy J. Bralower; Henk Brinkhuis, and Emily E. Comer, Brian T. Huber, Mauricio Ibañez Mejia, Brian R. Jicha, J. Marcelo Krause, Jonathan D. Schueth, Bradley S. Singer, María Sol Raigemborn, Mark D. Schmitz, Appy Sluijs, María del Carmen Zamaloa. 2014.
New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations .
GSA Bulletin 126. 289–306. Accessed 2017-08-15.
Jud, Nathan A.; Maria A. Gandolfo; Ari Iglesias, and Peter Wilf. 2017.
Flowering after disaster: Early Danian buckthorn (Rhamnaceae) flowers and leaves from Patagonia .
PLOS ONE 12. e0176164. Accessed 2019-02-14.
Ruiz, Daniela P.; Mariana Brea; M. Sol Raigemborn, and Sergio D. Matheos. 2017.
Conifer woods from the Salamanca Formation (early Paleocene), Central Patagonia, Argentina: Paleoenvironmental implications .
Journal of South American Earth Sciences 76. 427–445. Accessed 2019-02-14.
Ages Defining formations and sites
Sources