Also known as upper San Juan Fm., Gustavo 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 variabilis to E. suecicus zone, Middle Ordovician; both conodont zones correspond 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; argillaceous lime mudstone and shelly/skeletal wackestone
Size class: macrofossils
Preservation: cast
Collected by M. S. Beresi
• INGEO-PI = Invertebrate collections of Instituto de Geología, Facultad de Ciencias Exactas, Físicas y Naturales de la Universidad Nacional de San Juan
•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 87620: authorized by Björn Kröger, entered by Torsten Liebrecht on 21.03.2009
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
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Gangshanoceras villicumense n. sp.
Gangshanoceras villicumense n. sp. Kröger et al. 2007 INGEO-PI No. 691 Vi82 (type) + possibly some of the 20 reported specimens in the PI-IANIGLA collections
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