Lotena Formation
| 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.
See also
- Los Molles Formation, contemporaneous formation of the Neuquén Basin
- Cañadón Calcáreo Formation, contemporaneous formation of the Cañadón Asfalto Basin
References
- ^ Lotena Formation at Fossilworks.org
- ^ a b Zanettini et al., 2010, p.25
- ^ Veiga et al., 2011, p.174
- ^ Veiga et al., 2011, p.178
- ^ Wellnhofer, 1991, p.81
- ^ Herbstosaurus at Fossilworks.org
Bibliography
- Veiga, Gonzalo D.; Schwarz, Ernesto; Spalletti, Luis A. (2011), "Análisis estratigráfico de la Formación Lotena (Calloviano superior-Oxfordiano inferior) en la Cuenca Neuquina Central, República Argentina - Integración de información de afloramientos y subsuelo" (PDF), Andean Geology, 38: 171–197, doi:10.5027/andgeoV38n1-a10, retrieved 2017-08-03
- Wellnhofer, Peter (1991), Summary of Middle Jurassic Pterosaurs in The Illustrated Encyclopedia of Pterosaurs, Salamander Books Limited, London, UK, pp. 1–192, ISBN 0-86101-566-5
- Zanettini, Juan Carlos M.; Leanza, Héctor A.; Giusiano, Adolfo (2010), Programa Nacional de Cartas Geológicas de la República Argentina 1:250,000 - Hoja Geológica 3972-II Loncopué, SEGEMAR, pp. 1–93, retrieved 2017-08-03