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Sella Formation

Coordinates: 21°24′S 64°36′W / 21.4°S 64.6°W / -21.4; -64.6
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Sella Formation
Stratigraphic range: Dapingian-Darriwilian
~478–450 Ma
TypeGeological formation
Lithology
PrimarySiltstone, sandstone
OtherShale, limestone, coquina
Location
Coordinates21°24′S 64°36′W / 21.4°S 64.6°W / -21.4; -64.6
Approximate paleocoordinates42°48′S 131°36′W / 42.8°S 131.6°W / -42.8; -131.6
RegionTarija Department
CountryBolivia
Sella Formation is located in Bolivia
Sella Formation
Sella Formation
Sella Formation (Bolivia)

The Sella Formation is a Dapingian to Darriwilian geologic formation of southern Bolivia. The grey to green bioturbated siltstones interbedded with thin sandstone layers bear lenticular shell beds. Other parts of the formation contain yellow-green limy shales and grey sandy limestones. Coquinas often fill gutter casts and included brachiopods, trilobites, bivalves and nautiloids. The sediments were deposited in an open marine environment.[1][2][3][4][5] The species Coxiconchia sellaensis was named after the formation.

Fossil content

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The formation has provided the following fossils:

See also

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References

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Bibliography

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  • Suárez Riglos, Mario; Dalenz Farjat, Alejandra; Pérez Leyton, Miguel Ángel (2018), Fósiles y Facies de Bolivia (PDF), Sincronía Diseño & Publicidad, Santa Cruz de la Sierra, pp. 1–146, ISBN 978-99974-79-68-6, retrieved 2019-03-03

Further reading

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  • C. Babin and L. Branisa. 1987. Ribeiria, Peelrophon y otros molluscos del Ordovícico de Bolivia. 4˚ Congreso Latinoamericano de Paleontología 1:119-129
  • L. Branisa. 1965. Los fosiles guias de Bolivia: I. Paleozoico. Boletin de Servicio Geologico de Bolivia. La Paz, Bolivia 6:1-282
  • V. Havlicek and L. Branisa. 1980. Ordovician brachiopods of Bolivia: Succession of assemblages, climate control, affinity to Anglo-French and Bohemian provinces. Rozpravy Ceskoslovenske Akademie Ved. Rada Matematickych a Prirodnich Ved. Academia Praha, Prague, Czechoslovakia 90(1):1-54
  • T. M. Sánchez and C. Babin. 2005. Lower Ordovician bivalves from southern Bolivia: paleobiogeographic affinities. Ameghiniana 42(3):559-566
  • R. Suárez Soruco. 1976. El sistema ordovícico en Bolivia. Revista Tecnica YPF Bolivia 5(2):111-123