Sella, Bed 1 (Ordovician of Bolivia)

Where: Tarija, Bolivia (21.3° S, 64.6° W: paleocoordinates 45.2° S, 129.8° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Lower Member (Sella Formation), Arenig (478.6 - 466.0 Ma)

• middle Arenig (Baltographus deflexus / Baltograptus minutus zones)

• bed-level stratigraphic resolution

Environment/lithology: lithified, gray, green siltstone and lenticular sandstone

• The lower member is composed of gray to green bioturbated siltstones interbedded with thin sandstone layers bearing lenticular shell beds. Coquinas often fill gutter casts and included brachiopods, trilobites, bivalves and nautiloids

Size class: macrofossils

Collection methods: Beds 2 & 3 are 100 and 175 m up section, and have the identical fauna & lithology.

Primary reference: T. M. Sánchez and C. Babin. 2005. Lower Ordovician bivalves from southern Bolivia: paleobiogeographic affinities. Ameghiniana 42(3):559-566 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 57172: authorized by Pete Wagner, entered by Pete Wagner on 07.12.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

 Orthida - Glyptorthidae
Glyptorthis imbrex Havlicek and Branisa 1980
 Orthida - Plectorthidae
Desmorthis segnis Havlicek and Branisa 1980
 Palaeotaxodonta - Tironuculidae
Natasia boliviensis Babin and Branisa 1987 clam
 Modiomorphida - Modiomorphidae
Redonia riojana Sanchez 1997 clam
 Cardioni - Coxiconchiidae
Coxiconchia sellaensis n. sp. Sánchez and Babin 2005 clam
 Graptoloida - Didymograptidae