Where: San Juan, Argentina (30.3° S, 68.8° W: paleocoordinates 34.9° S, 132.3° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Upper Member (San Juan Formation), Late/Upper Llanvirn (463.5 - 460.9 Ma)

• Nemagraptus gracilis zone, Llanvirn

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified mudstone and chert

Size class: macrofossils

Primary reference: B.D.E. Chatterton, G. D. Edgecombe, B.G. Waisfeld and N.E. Vaccari. 1998. Ontogeny and systematics of Toernquistiidae (Trilobita, Proetida) from the Ordovician of the Argentine Precordillera. Journal of Paleontology 72(2):273-303 [P. Wagner/P. Wagner] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 73382: authorized by Pete Wagner, entered by Pete Wagner on 13.06.2007, edited by Sarah Kolbe