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Lotena Formation
Stratigraphic range: Late Callovian-Early Oxfordian ~165–160 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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 / -38.6; -70.2
Approximate paleocoordinates	35°54′S 31°42′W / 35.9°S 31.7°W / -35.9; -31.7
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.

References

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