Cerro Cumillango ( of Argentina)

Also known as Cerro Cumillango, San Juan Formation, Archaeorthis zone, San Juan

Where: San Juan, Argentina (30.5° S, 68.8° W: paleocoordinates 38.4° S, 128.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Archaeorthis brachiopod zone, San Juan Formation, Tremadoc (486.5 - 477.7 Ma)

• P. deltifer and P. proteus conodont zones; Archaeorthis brachiopod zone; Late Tremadoc(-Early Arenig?)

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified wackestone and lithified grainstone

• high-energy, shallow open platform, punctuated by storm events, at the beginning of the Late Tremadoc-Early Arenig transgression
• medium- to thick-bedded burrowed wackestones interbedded with lithoclastic and bioclastic grainstones and packstones

Size class: macrofossils

Preservation: replaced with silica

Primary reference: J. L. Benedetto, N. Cech, and C. Esbry. 2003. New Late Tremadoc-Early Arenig silicified brachiopods from the lower part of the San Juan Formation, Argentine Precordillera. Ameghiniana 40(4):513-530 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 66889: authorized by Wolfgang Kiessling, entered by Uta Merkel on 20.10.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Fossils include pelmatozoans, gastropods, nautiloids, trilobites, bivalves and calcareous algae.
Show authors, comments, and common names
Strophomenata
 Billingsellida - Polytoechiidae
Tritoechia (Parvitritoechia) preandina, Tritoechia (Tritoechia) prima
Tritoechia (Tritoechia) prima Benedetto et al. 2003
Rhynchonellata
 Pentamerida - Syntrophiidae
Syntrophia sanjuanina
Syntrophia sanjuanina Benedetto et al. 2003
 Pentamerida - Clarkellidae
Parallelostrophia septata
 Orthida - Orthidiellidae
Orthidium prominens n. sp.
Orthidium prominens n. sp. Benedetto et al. 2003
 Orthida - Archaeorthidae
Nothorthis marginata
Nothorthis marginata Benedetto et al. 2003
n. subsp. crassicosta