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°06′S 71°06′W / 53.1°S 71.1°W |
Approximate paleocoordinates | 55°18′S 61°24′W / 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 ( 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]
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]