Quebrada de Talacasto section, cephalopods (Ordovician of Argentina)

Also known as middle San Juan Fm., Talacasto Creek

Where: San Juan, Argentina (31.1° S, 68.6° W: paleocoordinates 36.3° S, 130.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: San Juan Formation, Floian (477.7 - 470.0 Ma)

• "Oepikodus evae Zone, [middle part of] San Juan Formation, upper Lower Ordovician; Quebrada de Talacasto section, central Precordillera, San Juan Province"; O. evae zone corresponds to Floian stage (see http://www.nhm.uio.no/norges/timescale/9b_Lower_Paleozoic_Sept08.pdf)

• bed-level stratigraphic resolution

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

• "The middle part of the San Juan Formation is a thick transgressive unit [...]. 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 [...] "
• "medium- to thick-bedded mud-wackestones"

Size class: macrofossils

Preservation: cast

Collected by M. S. Beresi

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

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 87615: 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 - Orthoceratidae
Palorthoceras kayseri n. gen. n. sp.
Palorthoceras kayseri n. gen. n. sp. Kröger et al. 2007
PI-IANIGLA No. 940 Ta 5 (type)