Loreto Formation
Geologic formation in Chile
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Loreto Formation (Spanish: Formación Loreto) is a sedimentary formation of Late Eocene age in the southernmost Magallanes Basin. It overlies the Leña Dura Formation and the contact with an overlying formation is not observed.[1] From 2013 to 2020 its coals were mined in Invierno mine, Riesco Island.[2][3][4]
| Loreto Formation | |
|---|---|
| Stratigraphic range: Priabonian (Divisaderan) | |
| Type | Geological formation |
| Underlies | not observed |
| Overlies | Leña Dura Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Conglomerate, coal |
| Location | |
| Coordinates | 53.1°S 71.1°W |
| Approximate paleocoordinates | 55.3°S 61.4°W |
| Region | Magallanes y la Antártica Chilena Region |
| Country | Chile |
| Extent | Magallanes Basin |
| Type section | |
| Named by | Hoffstetter et al. |
| Year defined | 1957 |
  Loreto Formation (Chile) | |
Description
The formation contains fossil wood, leaf imprints and palynomorphs.[5] Also fossil fish of Striatolamia macrota and Ischyodus dolloi and indeterminate Spheniscidae fossils have been found in the formation.[6][7]
The formation crops out in Brunswick Peninsula and Sierra Baguales among other places.[8]