The Cordobés Formation is an

Early Devonian The Early Devonian is the first of three epochs comprising the Devonian period, corresponding to the Lower Devonian series. It lasted from and began with the Lochkovian Stage , which was followed by the Pragian from and then by the Emsian, ...

( Pragian to

Emsian The Emsian is one of three faunal stages in the Early Devonian Epoch. It lasted from 407.6 ± 2.6 million years ago to 393.3 ± 1.2 million years ago. It was preceded by the Pragian Stage and followed by the Eifelian Stage. It is named after the ...

) 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 secondar ...

of the Durazno Group in the

Paraná Basin The Paraná Basin ( pt, Bacia do Paraná, es, Cuenca del Paraná) is a large cratonic sedimentary basin situated in the central-eastern part of South America. About 75% of its areal distribution occurs in Brazil, from Mato Grosso to Rio Grande d ...

in the

Durazno Department Durazno () is a department of Uruguay. Its capital is Durazno. Its name means ''"peach"'' in Spanish, referring to the department's peaches and its status as an agricultural breadbasket. It is located in the centre of the country, and is bounded ...

of central

Uruguay Uruguay (; ), officially the Oriental Republic of Uruguay ( es, República Oriental del Uruguay), is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast; while bordering ...

. The

shallow marine Shallow water marine environment refers to the area between the shore and deeper water, such as a reef wall or a shelf break. This environment is characterized by oceanic, geological and biological conditions, as described below. The water in this ...

shales preserve

trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the ...

, bivalve, gastropod and

brachiopod Brachiopods (), phylum Brachiopoda, are a phylum of trochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, w ...

fossils.Emsian Loc. 1 of Melo: Uraguayan outcrop belt
at Fossilworks.orgDaners et al., 2017

Description

The Cordobés Formation is characterized by reddish fine shale deposited in a

environment.

Fossil content

The following fossils have been reported from the formation:Melo, 1988 *

Trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the ...

s ** '' Acaste sp.'' ** '' Burmeisteria sp.'' ** '' Metacryphaeus sp.'' ** '' ?Calmonia sp.'' ** '' ?Paracalmonia sp.'' ** '' ?Pennaia sp.'' *

Lophophorata The Lophophorata are a Lophotrochozoan clade consisting of the Brachiozoa and the Bryozoa. They have a lophophore. Molecular phylogenetic analyses suggest that lophophorates are protostomes, but on morphological grounds they have been assessed ...

** '' Tentaculites sp.'' * Strophomenata ** '' Australostrophia sp.'' ** '' Notiochonetes sp.'' ** '' Schuchertella sp.'' *

Rhynchonellata The Rhynchonellata is a class of Lower Cambrian to Recent articulate brachiopods that combines orders from within the Rhynchonelliformea (Articulata revised) with well developed pedicle attachment. Shell forms vary from those with wide hinge li ...

** '' Derbyina sp.'' ** '' Australospirifer sp.'' ** '' Australocoelia sp.'' * Lingulata ** '' Orbiculoidea sp.'' ** '' "Lingula" sp.'' ** '' Styliolina sp.'' ** '' "Serpulites" sp.'' * Bivalves ** '' Modiolus sp.'' ** '' Modiomorpha sp.'' ** '' Goniophora sp.'' ** '' Pleurodapis sp.'' ** '' Nuculites sp.'' ** '' "Nuculana" sp.'' * Gastropods ** '' 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