PBDB Collection

Don Braulio section, Sierra de Villicúm (Ordovician of Argentina)

Also known as upper San Juan Fm., Don Braulio Creek, Villicum Range

Where: San Juan, Argentina (31.2° S, 68.5° W: paleocoordinates 34.5° S, 133.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: San Juan Formation, Darriwilian (467.3 - 458.4 Ma)

• "Eoplacognathus suecicus zone, Middle Ordovician"; E. suecicus zone corresponds to the middle Darriwilian stage (see http://www.nhm.uio.no/norges/timescale/9b_Lower_Paleozoic_Sept08.pdf)

• member-level stratigraphic resolution

Environment/lithology: open shallow subtidal; shelly/skeletal lime mudstone and shelly/skeletal limestone

• "The San Juan Formation was deposited on an open carbonate shelf, and was bounded to the west by continental slope and oceanic basin deposits (Beresi, 1986). The diverse marine fauna and the lack of features indicative of restricted marine conditions suggest low-energy, subtidal conditions on an open platform during the entire interval of San Juan Formation deposition. The calcareous algae and cyanobacteria indicate deposition within the photic zone [...] "

• "fossiliferous wackestones and mudstones which abruptly change at their top into bioclastic (crinoidal) grainstones and packstones in which nautiloids are concentrated"

Size class: macrofossils

Preservation: cast

Collected by M. S. Beresi

• PI-IANIGLA = Invertebrate collections of Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales

Primary reference: B. Kröger, M. S. Beresi, and E. Landing. 2007. Early orthoceratoid cephalopods from the Argentine Precordillera (Lower-Middle Ordovician). Journal of Paleontology 81(6):1266-1283 [P. Wagner/P. Wagner/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 87619: authorized by Björn Kröger, entered by Torsten Liebrecht on 21.03.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Cephalopoda
Orthocerida - Baltoceratidae	Cochlioceras avus Cochlioceras avus Eichwald 1860 PI-IANIGLA No. 920 Vi6
Orthocerida - Sactorthoceratidae	Braulioceras sanjuanense n. gen. n. sp. Braulioceras sanjuanense n. gen. n. sp. Kröger et al. 2007 PI-IANIGLA No. 925 Vi42 (type)