The Lecho Formation is a geological formation in the Salta Basin of the provinces Jujuy and Salta of northwestern Argentina. Its strata date back to the Early Maastrichtian, and is a unit of the Salta Group. The fine-grained bioturbated sandstones 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 fluviog ...

to lacustrine coastal plain environment. Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel et al., 2004, "Dinosaur distribution (Late Cretaceous, South America)." pp. 600-604 According to Frankfurt and Chiappe (1999), the Lecho Formation is composed of reddish sandstones. The Lecho is part of the Upper/Late Cretaceous Balbuena Subgroup (Salta Group), which is a near-border stratigraphic unit of the Andean sedimentary basin. Fossils from this formation include the titanosaur '' Saltasaurus'' along with a variety of avian and non-avian theropods.

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* * * * {{cite LSA , last=Frankfurt , first=N.G. , first2=L.M. , last2=Chiappe , year=1999 , title=A Possible Oviraptorosaur From The Late Cretaceous of Northwestern Argentina , journal= Journal of Vertebrate Paleontology , volume=19 , pages=101–105 Geologic formations of Argentina Cretaceous Argentina Sandstone formations Fluvial deposits Lacustrine deposits Cretaceous paleontological sites of South America Paleontology in Argentina

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