Loreto Formation

Loreto Formation () 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.
Description.
The formation contains fossil wood, leaf imprints and palynomorphs. Also fossil fish of "Striatolamia macrota" and "Ischyodus dolloi" and indeterminate Spheniscidae fossils have been found in the formation.
The formation crops out in Brunswick Peninsula and Sierra Baguales among other places.