The Itaboraian (Portuguese: Itaboraiense) age is a period within the Early Eocene geologic time (53.0–50.0 Ma) epoch of the Paleogene, used more specifically with South American land mammal ages (SALMA). It follows the Riochican and precedes the Casamayoran age.[1]
This age is named after the Itaboraí Formation in the Itaboraí Basin in Itaboraí, a Greater Rio municipality in the state of Rio de Janeiro in Brazil not very far away from Niterói.
| Formation | Country | Basin | class=unsortable | Notes |
|---|---|---|---|---|
| Itaboraí Formation | ||||
| Talara & Tumbes Basins | ||||
| Group | Fossils | Formation | class=unsortable | Notes |
|---|---|---|---|---|
| Mammals | ||||
| Carodnia inexpectans | ||||
| Birds | Diogenornis fragilis, Eutreptodactylus itaboraiensis, Itaboravis elaphrocnemoides, Paleopsilopterus itaboraiensis | |||
| Reptiles &<br />amphibians | Acherontisuchus guajiraensis, Anthracosuchus balrogus, Carbonemys cofrinii, Cerrejonemys wayuunaiki, Cerrejonisuchus improcerus, Pelomedusoides sp., Puentemys mushaisaensis, Titanoboa cerrejonensis | |||
| ?Madtsoia sp. | ||||
| Notocaiman stromeri | ||||
| Bretesuchus bonapartei | ||||
| Lorosuchus nodosus, Pelomedusoides cf. argentinensis | ||||
| Fishes | Dipnoi sp., Elopomorpha sp. | |||
| Lepidosiren cf. paradoxa, Ceratodus sp. | ||||
| Molluscs | Bulimulus fazendicus | |||
| Flora | Menispina evidens | |||
| Stephania palaeosudamericana | ||||
| Malvaciphyllum macondicus, Petrocardium cerrejonense, Petrocardium wayuuorum | ||||
| Formation | Ypresian (IUCS) • Wasatchian (NALMA) Bumbanian (ALMA) • Mangaorapan (NZ) | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basin | align=center rowspan=11 | |||||||||||||||
| Carodnia | align=center | align=center | align=center | align=center | align=center | align=center | align=center | align=center | ||||||||
| Gashternia | align=center | align=center | align=center | align=center | align=center | align=center | align=center | align=center | ||||||||
| Henricosbornia | align=center | align=center | align=center | align=center | align=center | align=center | align=center | align=center | ||||||||
| Victorlemoinea | align=center | align=center | align=center | align=center | align=center | align=center | align=center | align=center | ||||||||
| align=center | align=center | align=center | align=center | align=center | align=center | align=center | align=center | |||||||||
| Birds | align=center | align=center | align=center | align=center | align=center | align=center | align=center | align=center | ||||||||
| Reptiles | align=center | align=center | align=center | align=center | align=center | align=center | align=center | align=center | ||||||||
| align=center | align=center | align=center | align=center | align=center | align=center | align=center | align=center | |||||||||
| align=center | align=center | align=center | align=center | align=center | align=center | align=center | align=center | |||||||||
| Alluvial-lacustrine | Alluvial-fluvial | Fluvio-lacustrine | Lacustrine | Fluvial | Fluvio-deltaic | |||||||||||
| Volcanic | Yes | |||||||||||||||