Iscayachi Formation
The Iscayachi Formation, in older literature also referred to as Guanacuno Formation, is an extensive Tremadocian geologic formation of western and southern Bolivia. The shales and sandstones were deposited in a shallow marine to pro-delta environment.[1][2][3][4][5] The formation reaches a thickness of 1,000 metres (3,300 ft).[1]
| Iscayachi Formation Stratigraphic range: Tremadocian ~488–479 Ma | |
|---|---|
| Type | Geological formation |
| Thickness | 1,000 m (3,300 ft) |
| Lithology | |
| Primary | Shale, sandstone |
| Location | |
| Coordinates | 22.0°S 65.0°W |
| Approximate paleocoordinates | 46.3°S 128.3°W |
| Region | Potosí & Tarija Departments |
| Country |  |
| Type section | |
| Named for | Iscayachi |
  Iscayachi Formation (Bolivia) | |
Fossil content
Early Ordovician (470 Ma)
The formation has provided the following fossils:
- Akoldinoidia sinuosa[6]
- Altiplanelaspis palquiensis[7]
- Angelina hyeronimi, A. punctalineata[8]
- Asaphellus communis, A. riojanas
- Deltacare prosops
- Conophrys erquensis[9]
- Golasaphus palquiensis[7]
- Jujuyaspis keideli
- Kainella andina,[6] K. meridionalis
- Kvania lariensis
- Leptoplastides mariana
- Macrocystella bavarica
- Micragnostus hoeki
- Onychopyge branisai[10]
- Parabolinella argentinensis, P. boliviana[11]
- Pharostomina alvarezi, P. trapezoidalis[12]
- Rhabdinopora flabelliformis
- Rhadinopleura incaica[10]
- Rossaspis rossi
- Saltaspis steinmanni[11]
- Shumardia erquensis
- Leptoplastides cf. granulosa[13]
- Altiplanelaspis sp.
- Araiopleura sp.
- Broeggeria sp.
- Ctenodonta sp.
- Dictyonema sp.
- Koldinioidia sp.
- Leiostegium sp.
- Nanorthis sp.
- Onychopyge sp.
- Palquiella sp.
- Parabolina sp.
- Saltaspis sp.
- Sphaerocare sp.
- Trilobitarum sp.
- Tropidodiscus sp.
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References
- Suárez Riglos et al., 2018, p.37
- Quebrada de Rota at Fossilworks.org
- Palqui at Fossilworks.org
- Tres Cruces at Fossilworks.org
- Iscayachi Formation at Fossilworks.org
- Suárez Riglos et al., 2018, p.52
- Suárez Riglos et al., 2018, p.43
- Suárez Riglos et al., 2018, p.48
- Suárez Riglos et al., 2018, p.53
- Suárez Riglos et al., 2018, p.45
- Suárez Riglos et al., 2018, p.51
- Suárez Riglos et al., 2018, p.42
- Suárez Riglos et al., 2018, p.47
Bibliography
- Suárez Riglos, Mario; Alejandra Dalenz Farjat, and Miguel Ángel Pérez Leyton. 2018. Fósiles y Facies de Bolivia, 1–146. Sincronía Diseño & Publicidad, Santa Cruz de la Sierra. Accessed 2019-03-03. ISBN 978-99974-79-68-6
Further reading
- J. L. Benedetto. 2007. New Upper Cambrian-Tremadoc rhynchonelliformean brachiopods from northwestern Argentina: evolutionary trends and early diversification of plectorthoideans in the Andean Gondwana. Journal of Paleontology 81(2):261-285
- A. Pribyl and J. Vanek. 1980. Ordovician trilobites of Bolivia. Rozpravy Ceskoslovenske Akademie Ved. Rada Matematickych a Prirodnich Ved. Academia Praha, Prague, Czechoslovakia 90(2):1-90
- R. Suárez Soruco. 1976. El sistema ordovícico en Bolivia. Revista Tecnica YPF Bolivia 5(2):111-123
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