Where: San Juan, Argentina (30.3° S, 68.8° W: paleocoordinates 34.5° S, 132.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Las Aguaditas Formation, Costonian (460.9 - 457.5 Ma)

• Nemagraptus gracilis zone

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified marl and claystone

Size class: macrofossils

Primary reference: G. D. Edgecombe, B. D. E. Chatterton, N.E. Vaccari and B.G. Waisfield. 1999. Ordovician cheirurid trilobites from the Argentine Precordillera. Journal of Paleontology 73(6):1155-1175 [A. Miller/S. Kolbe] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 115232: authorized by Arnold Miller, entered by Sarah Kolbe on 31.08.2011