The Cordobés Formation is an Early Devonian (

Pragian The Pragian is one of three faunal stages in the Early Devonian Epoch. It lasted from 410.8 ± 2.8 million years ago to 407.6 ± 2.8 million years ago. It was preceded by the Lochkovian Stage and followed by the Emsian Stage. The most important La ...

to Emsian) 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 ...

of the Durazno Group in the Paraná Basin in the Durazno Department of central Uruguay. The shallow marine

shale Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4) and tiny fragments (silt-sized particles) of other minerals, especial ...

s preserve trilobite,

bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bival ...

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

and brachiopod fossils.Emsian Loc. 1 of Melo: Uraguayan outcrop belt
at

Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...

.orgDaners et al., 2017

Description

The Cordobés Formation is characterized by reddish fine

deposited in a shallow marine environment.

Fossil content

The following fossils have been reported from the formation:Melo, 1988 * Trilobites ** '' Acaste sp.'' ** '' Burmeisteria sp.'' ** '' Metacryphaeus sp.'' ** '' ?Calmonia sp.'' ** '' ?Paracalmonia sp.'' ** '' ?Pennaia sp.'' * Lophophorata ** '' Tentaculites sp.'' *

Strophomenata Strophomenata is an extinct class of brachiopods in the subphylum Rhynchonelliformea. Orders Billingsellida An order that contains the suborder Clitambonitidina (and others?) . Orthotetida An order or superfamily that includes the Chilidiopsoi ...

** '' Australostrophia sp.'' ** '' Notiochonetes sp.'' ** '' Schuchertella sp.'' * Rhynchonellata ** '' Derbyina sp.'' ** '' Australospirifer sp.'' ** '' Australocoelia sp.'' *

Lingulata Lingulata is a class of brachiopods, among the oldest of all brachiopods having existed since the Cambrian period (). They are also among the most morphologically conservative of the brachiopods, having lasted from their earliest appearance to the ...

** '' Orbiculoidea sp.'' ** '' "Lingula" sp.'' ** '' Styliolina sp.'' ** '' "Serpulites" sp.'' *

Bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bival ...

s ** '' Modiolus sp.'' ** '' Modiomorpha sp.'' ** '' Goniophora sp.'' ** '' Pleurodapis sp.'' ** '' Nuculites sp.'' ** '' "Nuculana" sp.'' *

Gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

s ** '' Encrinaster sp.'' ** '' Plectonotus sp.''

References

Bibliography

* * {{DEFAULTSORT:Cordobes Formation Geologic formations of Uruguay Devonian System of South America Devonian Uruguay Emsian Stage Pragian Stage Shale formations Shallow marine deposits Formations Fossiliferous stratigraphic units of South America Paleontology in Uruguay Formations

Description

Fossil content

See also

References

Bibliography