The Riochican (es|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]
This age is named after the Río Chico Group of the Golfo San Jorge Basin.
| Formation | Country | Basin | class=unsortable | Notes |
|---|---|---|---|---|
| Río Chico Group | ||||
| Talara & Tumbes Basins | ||||
| Group | Fossils | Formation | class=unsortable | Notes |
|---|---|---|---|---|
| Mammals | Etayoa bacatensis | |||
| Eoastrapostylops riolorense, Notonychops powelli, Satshatemnus bonapartei | ||||
| Reptiles &<br />amphibians | ||||
| Pelomedusoides sp. | ||||
| Lorosuchus nodosus, Pelomedusoides cf. argentinensis | ||||
| Fishes | ?Cyprinodon primulus | |||
| 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 | |||
| 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 | |||
| Palmoxylon patagonicum | ||||
| Cordioxylon prototrichotoma | ||||
| Palmoxylon patagonicum | ||||