Cerro San Bernardo, 2 kilometer east of Salta (Ordovician of Argentina)

Where: Salta, Argentina (24.7° S, 65.3° W: paleocoordinates 41.9° S, 131.2° W)

• outcrop-level geographic resolution

When: Upper Member (Santa Bernardo Formation), Arenig (478.6 - 466.0 Ma)

• Early Arenig; "The lower Arenig strata cropping out in the Sierra de Mojotoro were referred by Moya (1998) to the San Bernardo Formation."

• group of beds-level stratigraphic resolution

Environment/lithology: shoreface; green mudstone and fine-grained sandstone

• It consists of olive-green, richly fossiliferous mudstones interbedded with fine-grained sandstones which often contain shell concentrations formed by trilobite sclerites, brachiopods, gastropods, scattered bivalves, and nautiloids (Fig. 2.2 ). The fine-grained sandstones and siltstones near the middle part of this unit yielded some specimens of Cienagomya bidentata and Ucumaropsis lermaensis (Table 1 ).

Size class: macrofossils

Primary reference: T. M. Sánchez. 2005. New Bivalvia and Rostroconchia from the Early Ordovician (Late Tremadoc - Middle Arenig) of northwestern Argentina. Journal of Paleontology 79(3):532-541 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 57211: authorized by Pete Wagner, entered by Pete Wagner on 12.12.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Pholadomyida - Ucumariidae
Ucumaropsis lermaensis n. gen. n. sp.
Ucumaropsis lermaensis n. gen. n. sp. Sánchez 2005 clam
 Actinodontida - Intihuarellidae
Cienagomya bidentata n. gen. n. sp.
Cienagomya bidentata n. gen. n. sp. Sánchez 2005 clam