LA 4, Las Aguaditas North Section, ~5.5 km west and ~9.5 km south of San José da Jáchal (Ordovician of Argentina)

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 (458.4 - 457.2 Ma)

• ?Nemagraptus gracilis zone

• bed-level stratigraphic resolution

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

• marlstones in slumps (Fig. 2).

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 73368: authorized by Pete Wagner, entered by Pete Wagner on 13.06.2007, edited by Sarah Kolbe and Melanie Hopkins

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Phacopida - Cheiruridae
Nieszkowskia jakei3
Nieszkowskia jakei3 Edgecombe et al. 1999 trilobite
 Phacopida - Calymenidae
Platycalymene trapezoidalis1
Platycalymene trapezoidalis1 Baldis and Pothe 1995 trilobite
 Olenida - Olenidae
Triarthrus jachalensis2
Triarthrus jachalensis2 Harrington and Leanza 1957 trilobite
 Proetida - Dimeropygidae
"Paratoernquistia sanchezae" = Toernquistia sanchezae
"Paratoernquistia sanchezae" = Toernquistia sanchezae Chatterton et al. 1998 trilobite
1Edgecombe et al. 1998; 2Edgecombe et al. 2005; 3Edgecombe et al. 1999