Where: San Juan, Argentina (30.3° S, 68.1° W: paleocoordinates 34.6° S, 135.6° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Atavograptus atavus graptolite zone, La Chilca Formation, Rhuddanian (443.4 - 440.8 Ma)

• Age based on fact that beds containing the brachiopods are interbedded with or above beds of Atovograptus atavus Biozone.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal sandstone and shale

Size class: macrofossils

Preservation: replaced with silica

Collection methods: Brachiopods studied and listed; other higher taxa simply mentioned; graptolites listed for two of the sections that contain them. See location details.

Primary reference: O. Lehnert, S. M. Bergström, J. L. Benedetto and N. E. Vaccari. 1999. First record of Lower Silurian conodonts from South America: biostratigraphic and palaeobiogeographic implications of Llandovery conodonts in the Precordillera of Argentina. Geological Magazine 136(2):119-131 [P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 203574: authorized by Pete Wagner, entered by Pete Wagner on 20.08.2019

Creative Commons license: CC BY (attribution)