The Lautaro Formation is sedimentary and fossiliferous geological formation that largely crops out near Copiapó (Atacama Region ), Chile . It is dated back to the Jurassic period (Toarcian through Aalenian stages). The lithology of the formation comprises limestone and sandstone , formed in marine settings. The Lautaro Formation preserves a marine fossil record, representing molluscs (bivalves , gastropods ) and marine reptiles (metriorhynchids , plesiosaurs ).[ 1] [ 2] [ 3]
The strata of the Lautaro Formation and its basin of deposition (the Lautaro Basin ) have been subject to intense tectonic movement during the Mesozoic, producing large-scale stratigraphic discontinuity and tectonic inversion .[ 2] [ 4] [ 5] [ 6] [ 7]
File:Tranque Lautaro, Copayapu.jpg Strata of the Lautaro Formation exposed at the Tranque Lautaro File:La Puerta, Atacama Region (20).jpg Fossils of Gryphaea Lithotrochus File:La Puerta, Atacama Region (15).jpg Fossils of Gryphaea at La Puerta
Genus
Species
Material
Locality
Unit
Notes
Images
Gryphaea G. darwini
Partial and complete shells.[ 2]
La Puerta, Tranque Lautaro
A gryphaeid bivalve.
Weyla W. alata
Partial and complete shells.[ 8] [ 2]
La Puerta, Tranque Lautaro
A pectinid bivalve.
Genus
Species
Material
Locality
Unit
Notes
Images
Lithotrochus L. humboldtii
Partial and complete shells.[ 2]
La Puerta, Tranque Lautaro
A trochid gastropod.
Genus
Species
Material
Locality
Unit
Notes
Images
Plesiosauria indet.
Indeterminate
Three vertebrae.[ 3]
Quebrada La Iglesia
Upper part
A plesiosaur .
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