Riochican

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Geologic age

title: "Riochican" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["riochican", "paleocene-south-america", "eocene-south-america", "paleogene-argentina"] description: "Geologic age" topic_path: "geography/argentina" source: "https://en.wikipedia.org/wiki/Riochican" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Geologic age ::

The Riochican () 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.

Etymology

This age is named after the Río Chico Group of the Golfo San Jorge Basin.

Formations

| relief = 1 | width = 300 | caption = Locations of Riochican formations | places = | lat_deg = -5.5 | lon_deg = -78.6 | mark = Orange pog.svg | marksize = 10 | link = Chota Formation | lat_deg = 4.488444 | lon_deg = -74.135694 | mark = Orange pog.svg | marksize = 10 | link = Bogotá Formation | lat_deg = -43.7 | lon_deg = -67.8 | mark = Orange pog.svg | marksize = 10 | link = Bororó Formation | lat_deg = -26.1 | lon_deg = -65.4 | mark = Orange pog.svg | marksize = 10 | link = Maíz Gordo Formation | lat_deg = -23.1 | lon_deg = -65.6 | mark = Orange pog.svg | marksize = 10 | link = Mealla Formation | lat_deg = -26.6 | lon_deg = -65.2 | mark = Orange pog.svg | marksize = 10 | link = Río Loro Formation | lat_deg = -15.7 | lon_deg = -70.2 | mark = Orange pog.svg | marksize = 10 | link = Muñani Formation

| lat_deg = -4.1 | lon_deg = -80.9 | mark = Orange pog.svg | marksize = 10 | link = Mogollón Formation | lat_deg = -45.6 | lon_deg = -69.1 | mark = Orange pog.svg | marksize = 10 | link = Las Flores Formation, Austral Basin | lat_deg = -45.3 | lon_deg = -67.0 | mark = Orange pog.svg | marksize = 10 | link = Peñas Coloradas Formation | lat_deg = -45.3 | lon_deg = -67.0 | mark = Orange pog.svg | marksize = 14 | link = Río Chico Group ::data[format=table] | Formation bold is type | Country | Basin | Notes | |---|---|---|---| | Río Chico Group | | Golfo San Jorge Basin | | | Bogotá Formation | | Altiplano Cundiboyacense | | | Bororó Formation | | Golfo San Jorge Basin | | | Chota Formation | | Bagua Basin | | | Koluel Kaike Formation | | Golfo San Jorge Basin | | | Las Flores Formation | | Austral Basin | | | Maíz Gordo Formation | | Salta Basin | | | Mealla Formation | | Salta Basin | | | Mogollón Formation | | Talara & Tumbes Basins | | | Muñani Formation | | Altiplano Basin | | | Peñas Coloradas Formation | | Golfo San Jorge Basin | | | Río Loro Formation | | Sierras Pampeanas | | | Salamanca Formation | | Golfo San Jorge Basin | | ::

Fossils

::data[format=table]

GroupFossilsFormationNotes
MammalsEtayoa bacatensisBogotá
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 bonaparteiRío Loro
Reptiles &
amphibiansTestudines indet.Koluel Kaike
Pelomedusoides sp.Maíz Gordo
Lorosuchus nodosus, Pelomedusoides cf. argentinensisRío Loro
Fishes?Cyprinodon primulusMaíz Gordo
InsectsAnthicus 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 stebingeriMaíz Gordo
FloraBanaraphyllum ovatum, Cissites patagonica, Cryptocaryoides mariasantisimensis, Dryophyllum australis, Fagophyllum duseni, Laurophyllum chubutensis, Laurophyllum piatnitzkyi, Myrica premira, Nothofagidites visserensis, Paranymphaea aristolochiaformis, Sterculia acuminataloba, Zizyphus chubutensisRío Chico
Palmoxylon patagonicumBororó
Cordioxylon prototrichotoma[Peñas
Coloradas](penas-coloradas-formation)
Palmoxylon patagonicumSalamanca
::

References

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

;Río Loro Formation

;Salamanca Formation

References

  1. [https://paleodb.org/cgi-bin/bridge.pl?action=displayInterval&interval_no=736 Paleo Database: Riochican]
  2. Raigemborn et al., 2010, p.240
  3. Bayona et al., 2012, p.103
  4. Scarfati et al., 2009, p.36
  5. Chacaltana et al., 2015, p.2
  6. Castro Medina, 2010, p.53
  7. Raigemborn et al., 2010, p.251
  8. Raigemborn et al., 2010, p.249
  9. Narváez, 2009, p.24
  10. Sánchez & Marquillas, 2010, p.389
  11. Quispe Alcalá, 2010, p.21
  12. Gelfo & Goin, 2011
  13. Clyde et al., 2014, p.303
  14. Pol & Powell, 2011, S9
  15. [https://paleobiodb.org/classic/displayCollResults?collection_no=140910 Quebrada Mochuelo] at [[Fossilworks]].org
  16. [https://paleobiodb.org/classic/displayCollResults?collection_no=52703 Bajo Palangana] at [[Fossilworks]].org
  17. [https://paleobiodb.org/classic/displayCollResults?collection_no=13781 Bajo de la Palangana] at [[Fossilworks]].org
  18. [https://paleobiodb.org/classic/displayCollResults?collection_no=175728 Cerro Redondo] at [[Fossilworks]].org
  19. [https://paleobiodb.org/classic/displayCollResults?collection_no=41607 Aguas Chiquitas] at [[Fossilworks]].org
  20. [https://paleobiodb.org/classic/displayCollResults?collection_no=118480 Quebrada del Puesto] at [[Fossilworks]].org
  21. [https://paleobiodb.org/classic/displayCollResults?collection_no=58702 El Cadillal Lake] at [[Fossilworks]].org
  22. [https://paleobiodb.org/classic/displayCollResults?collection_no=151867 Sierra Santa Bárbara East] at [[Fossilworks]].org
  23. [https://paleobiodb.org/classic/displayCollResults?collection_no=151868 Quebrada El Gritón] at [[Fossilworks]].org
  24. [https://paleobiodb.org/classic/displayCollResults?collection_no=122881 La Cuesta Azul] at [[Fossilworks]].org
  25. [https://paleobiodb.org/classic/displayCollResults?collection_no=106995 El Fuerte] at [[Fossilworks]].org
  26. [https://paleobiodb.org/classic/displayCollResults?collection_no=113004 La Mendieta] at [[Fossilworks]].org
  27. [https://paleobiodb.org/classic/displayCollResults?collection_no=114155 El Garabatal] at [[Fossilworks]].org
  28. [https://paleobiodb.org/classic/displayCollResults?collection_no=151863 Sunchal] at [[Fossilworks]].org
  29. [https://paleobiodb.org/classic/displayCollResults?collection_no=110536 Sunchal Station 3] at [[Fossilworks]].org
  30. [https://paleobiodb.org/classic/displayCollResults?collection_no=167857 Cerro Funes] at [[Fossilworks]].org
  31. [https://paleobiodb.org/classic/displayCollResults?collection_no=167879 Puerto Visser] at [[Fossilworks]].org
  32. [https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=189486 ''Palmoxylon''] at [[Fossilworks]].org
  33. [https://paleobiodb.org/classic/displayCollResults?collection_no=137303 Puerto Visser] at [[Fossilworks]].org

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riochicanpaleocene-south-americaeocene-south-americapaleogene-argentina