The Lagarcito Formation is an

Albian The Albian is both an age of the geologic timescale and a stage in the stratigraphic column. It is the youngest or uppermost subdivision of the Early/Lower Cretaceous Epoch/ Series. Its approximate time range is 113.0 ± 1.0 Ma to 100.5 ± ...

geologic

formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondary ...

Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, t ...

Pterosaur Pterosaurs (; from Greek ''pteron'' and ''sauros'', meaning "wing lizard") is an extinct clade of flying reptiles in the Order (biology), order, Pterosauria. They existed during most of the Mesozoic: from the Late Triassic to the end of the Cre ...

fossils have been recovered from the formation. The formation overlies the La Cruz Formation and is overlain by the San Roque Formation. The

sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates ...

s and mudstones of the formation were deposited in a

fluvial In geography and geology, fluvial processes are associated with rivers and streams and the deposits and landforms created by them. When the stream or rivers are associated with glaciers, ice sheets, or ice caps, the term glaciofluvial or fluv ...

and mostly

lacustrine A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much larger ...

environment Environment most often refers to: __NOTOC__ * Natural environment, all living and non-living things occurring naturally * Biophysical environment, the physical and biological factors along with their chemical interactions that affect an organism or ...

.Gardini et al., 2009, p.554 The fossil association and the geological evidence indicate that the Lagarcito Formation represents a perennial shallow lake situated in an

alluvial plain An alluvial plain is a largely flat landform created by the deposition of sediment over a long period of time by one or more rivers coming from highland regions, from which alluvial soil forms. A floodplain is part of the process, being the s ...

where detrital sedimentation and semiarid climatic conditions predominated.

Fossil content

The following fossils have been found in the Lagarcito Formation:Loma del Pterodaustro
at

Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database, a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was cre ...

.org * '' Neosemionotus puntanus'' * '' Lepidotes pusillus'' * ''

Pterodaustro guinazui ''Pterodaustro'' is a genus of ctenochasmatid pterodactyloid pterosaur from South America. Its fossil remains dated back to the Early Cretaceous period, about 105 million years ago. The most distinctive characteristic that separates ''Pter ...

'' * '' Treptichnus pollardi'' * '' Cyzicus aff. codoensis'' * '' Darwinula sp.'' * '' Copytus sp.'' * '' Bisulcocypris sp.'' * '' Candonopsis sp.'' * Anura indet. * Magnoliophyta indet. * Pleuropholidae indet. * Trichoptera indet.

References

Bibliography

* {{cite LSA , last=Gardini , first=Carlos , last2=Rivarola , first2=David , last3=Agüera , first3=Maximiliano , last4=Candela , first4=Gerónimo , year=2009 , title=Estructura de la región Sierra de Guayaguas-Marayes, Provincias de San Juan y San Luis , url=http://www.scielo.org.ar/pdf/raga/v65n3/v65n3a12.pdf , journal=

Revista de la Asociación Geológica Argentina The ''Revista de la Asociación Geológica Argentina'' is an open access peer-reviewed scientific journal In academic publishing, a scientific journal is a periodical publication intended to further the progress of science, usually by repor ...

, volume=65 , pages=551–565 , accessdate=2018-09-08

Fossil content

See also

References

Bibliography

Further reading