Sella Formation

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.Sella C at Fossilworks.orgPantipampa, 3 kilometers east of Belle Vista at Fossilworks.orgSella, Bed 1 at Fossilworks.orgSella at Fossilworks.orgSella Bed 4 at Fossilworks.org The species Coxiconchia sellaensis was named after the formation.

Fossil content The formation has provided the following fossils:

Baltograptus minutusSuárez Riglos et al., 2018, p.64 Coxiconchia sellaensis Desmorthis segnis Glyptorthis imbrex Hemiprionodonta lusitanica Lingulocystis boliviensis Natasia boliviensis Pliomeridius sulcatus Redonia riojana Ribeiria spinosa Peelerophon cf. oehlerti Ampyx sp. Boeckaspis sp. Branisaspis sp. Bucania sp. Colpocoryphe sp. Cosmogoniophorina sp. Ctenodonta sp. Cyptendoceras sp. Didymograptus sp. Endoceras sp. Eothinoceras sp. Famatinolithus sp. Haploprimitia sp. Hoekaspis sp. Lecanospira sp. Lonchodomas sp. Maclurites sp. Quadrilobella sp. Parapyxion sp. Protocycloceras sp. Sibiritella sp. Suriaspis sp. Synhomalonotus sp. Technophorus sp. Trinucleus sp.

See also List of fossiliferous stratigraphic units in Bolivia

References

Bibliography

Further reading 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