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]
Strata of the Lautaro Formation exposed at the Tranque Lautaro Fossils of Gryphaea Lithotrochus 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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