Lotena Formation
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| Lotena Formation | |
|---|---|
| Stratigraphic range: Late Callovian-Early Oxfordian ~ | |
| Type | Geological formation |
| Unit of | Lotena Group |
| Sub-units | La Estrechura, El Pichanal & El Vado Members |
| Underlies | La Manga Formation |
| Overlies | Cuyo Group Lajas Formation |
| Thickness | 50–167 m (164–548 ft) |
| Lithology | |
| Primary | Sandstone, conglomerate |
| Other | Limestone, shale |
| Location | |
| Coordinates | 38°36′S 70°12′W / 38.6°S 70.2°W |
| Approximate paleocoordinates | 35°54′S 31°42′W / 35.9°S 31.7°W |
| Region | Neuquén Basin Mendoza Province & Neuquén Province Northern Patagonia |
| Country | Argentina |
| Extent | 2,500 km2 (970 sq mi) |
| Type section | |
| Named for | Cerro Lotena |
| Named by | Weaver |
| Year defined | 1931 |
  Lotena Formation (Argentina) | |
The Lotena Formation is a geologic formation dated from the Late Callovian to Early Oxfordian in the Neuquén Basin in Mendoza Province, Argentina.[1] The formation, first defined by Weaver in 1931 and named after Cerro Lotena,[2] consists of fluvial conglomerates, calcareous sandstones and marine limestones and shales.[2][3] The Lotena Formation is overlain by the La Manga Formation and overlies the Lajas Formation of the Cuyo Group.[4] Initially, the fossil find of the pterosaur Herbstosaurus pigmaeus was reported from the formation,[5] but this fossil was found in the younger Vaca Muerta.[6] The formation is a reservoir rock in the Neuquén Basin.