Also known as Left side of the Los Gatos Creek

Where: San Juan, Argentina (30.3° S, 68.2° W: paleocoordinates 35.4° S, 132.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Paroistodus horridus conodont zone, San Juan Formation, Darriwilian (467.3 - 458.4 Ma)

• The age of the uppermost nodular limestones of the San Juan Formation is well constrained by conodonts belonging to the Paroistodus horridus Subzone of the Lenodus variabilis Zone (Ottone et al. 1999; Albanesi & Ortega 2002), of early Darriwilian age (Fig. 1). The immediately overlying black shales (lower member of the Los Azules Formation) have yielded a graptolite assemblage referred to as the Undulograptus dentatus Biozone, whereas the topmost beds of the San Juan Formation contain Undulograptus austrodentatus (Mitchell et al. 1998; Brussa et al. 2003; Ortega & Rickards 2003), the marker of the base of theDarriwilian Stage, corresponding to the Dw1 ‘substage’ of Bergström et al. (2008).

• group of beds-level stratigraphic resolution

Environment/lithology: nodular limestone and mudstone

Size class: macrofossils

Primary reference: J. L. Benedetto. 2012. Gatosella, a new basal plectambonitoid brachiopod with undercut cardinal process from Middle Ordovician limestones of the Precordillera terrane, Argentina. Journal of Systematic Palaeontology 10(3):435-443 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 162356: authorized by Pete Wagner, entered by Pete Wagner on 23.09.2014

Creative Commons license: CC BY (attribution)