Lagarcito Formation
The Lagarcito Formation is an Albian geologic formation in Argentina. Pterosaur fossils have been recovered from the formation. The formation overlies the La Cruz Formation and is overlain by the San Roque Formation. The sandstones and mudstones of the formation were deposited in a fluvial and mostly lacustrine environment.[1] The fossil association and the geological evidence indicate that the Lagarcito Formation represents a perennial shallow lake situated in an alluvial plain where detrital sedimentation and semiarid climatic conditions predominated.[2]
| Lagarcito Formation Stratigraphic range: Albian | |
|---|---|
| Type | Geological formation |
| Underlies | San Roque Formation |
| Overlies | La Cruz Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Mudstone |
| Location | |
| Coordinates | 32.5°S 67.0°W |
| Approximate paleocoordinates | 38.0°S 38.7°W |
| Region | San Luis Province |
| Country |  |
| Extent | Marayes-El Carrizal Basin |
  Lagarcito Formation (Argentina) | |
Fossil content
late Early Cretaceous (105 Ma)
The following fossils have been found in the Lagarcito Formation:[3]
- Neosemionotus puntanus
- Lepidotes pusillus
- Pterodaustro guinazui
- Treptichnus pollardi
- Cyzicus aff. codoensis
- Darwinula sp.
- Copytus sp.
- Bisulcocypris sp.
- Candonopsis sp.
- Anura indet.
- Magnoliophyta indet.
- Pleuropholidae indet.
- Trichoptera indet.
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References
- Gardini et al., 2009, p.554
- Loma del Pterodaustro fossil site at Fossilworks.org
- Loma del Pterodaustro at Fossilworks.org
Bibliography
- Gardini, Carlos; David Rivarola; Maximiliano Agüera, and Gerónimo Candela. 2009. Estructura de la región Sierra de Guayaguas-Marayes, Provincias de San Juan y San Luis. Revista de la Asociación Geológica Argentina 65. 551–565. Accessed 2018-09-08.
Further reading
- A. López-Arbarello and L. Codorniú. 2007. Semionotids (Neopterygii, Semionotiformes) from the Lower Cretaceous Lagarcito Formation, San Luis Province, Argentina. Journal of Vertebrate Paleontology 27(4):811-826
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