The Llallagua Formation is a

Rhuddanian In the geologic timescale, the Rhuddanian is the first age of the Silurian Period and of the Llandovery Epoch. The Silurian is in the Paleozoic Era of the Phanerozoic Eon. The Rhuddanian Age began 443.8 ± 1.5 Ma and ended 440.8 ± 1.2 Ma (mi ...

Homerian In the geologic timescale, the Homerian is an age of the Wenlock Epoch of the Silurian Period of the Paleozoic Era of the Phanerozoic Eon that is comprehended between 430.5 ± 0.7 Ma and 427.4 ± 0.5 Ma (million years ago), approximately. Th ...

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 western Bolivia. The formation comprises siliciclastic sediments. The fossil fauna suggests a warm water, nearshore current was active allowing northern hemisphere benthos to exist in the formation.Llallagua Formation
at

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Fossil content

The formation has provided the following fossils: * ''

Atrypa reticularis ''Atrypa'' is a genus of brachiopod with shells round to short egg-shaped, covered with many fine radial ridges (or costae), that split further out and growth lines perpendicular to the costae and 2-3 times wider spaced. The pedunculate valve is ...

'' * ''

Leptaena rhomboidalis ''Leptaena'' is an extinct genus of mid-sized brachiopod that existed from the Dariwilian epoch to the Emsian epoch, though some specimens have been found in strata as late in age as the Tournasian epoch. Like some other Strophomenids, ''Lep ...

'' * '' Orthostrophia cf. dartae'' * '' Chonetes sp.'' * '' Dalejina sp.'' * '' Dalmanites sp.'' * '' Orthostrophella sp.'' * '' Plectodonta sp.'' * '' Protochonetes sp.'' * '' Syntrophia sp.''

References

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Fossil content

See also

References

Further reading