Mogotes Azules (Silurian of Argentina)

Where: San Juan, Argentina (30.3° S, 68.7° W: paleocoordinates 34.1° S, 134.9° W)

• outcrop-level geographic resolution

When: Parakidograptus acuminatus graptolite zone, La Chilca Formation, Rhuddanian (443.4 - 440.8 Ma)

• Figure 2. In the Talacasto area the lowermost 0.60 m of the La Chilca Formation yielded a graptolite assemblage dominated by Persculptograptus persculptus (Salter) followed by species suggesting the Parakidograptus acuminatus Zone (from 0.6 m to 1.6 m), so that the Ordovician-Silurian boundary lies between those two zones (Cuerda et al., 1988).

• bed-level stratigraphic resolution

Environment/lithology: limestone

Size class: macrofossils

Preservation: mold/impression

Collection methods: CEGH specimens

Primary reference: J. Benedetto and L. R. M. Cocks. 2009. Early Silurian (Rhuddanian) brachiopods from the Argentine Precordillera and their biogeographic affinities. Ameghiniana 46(2):241-253 [P. Wagner/P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 152405: authorized by Pete Wagner, entered by Pete Wagner on 20.11.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

• Brachiopods and graptolites.
Strophomenata
 Orthotetida - Chilidiopsidae
Fardenia sp. Lamont 1935
 Strophomenida - Sowerbyellidae
Eoplectodonta (Eoplectodonta) duplicata de Sowerby and Murchison 1839
 Strophomenida - Leptestiidae
Leangella (Leangella) america n. sp. Benedetto and Cocks 2009
Rhynchonellata
 Athyridida - Meristellidae
Hindella crassa Sowerby 1839
 Rhynchonellida - Rhynchotrematidae
Stegerhynchus pusillum de Sowerby and Murchison 1839
 Orthida - Dalmanellidae
Dalmanella sp. Hall and Clarke 1892
 Orthida - Glyptorthidae
Glyptorthis vidari Baarli 1995
 Orthida - Hesperorthidae
Dolerorthis plicata de Sowerby and Murchison 1839
 Orthida - Giraldiellidae
Giraldiellidae "indet." Williams et al. 2000