Neptune Range area, Nelson Limestone Fm, Mmb 3 (Cambrian of Antarctica)

Where: Antarctica (83.8° S, 55.8° W: paleocoordinates 10.8° S, 153.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Nelsonia schesis trilobite zone, 3 Member (Nelson Limestone Formation), Guzhangian (500.5 - 497.0 Ma)

• in the lower part of the Nelson Limestone. late Middle Cambrian. PJW: lower part of formation is Lieberman's (2004) Nelsonia schesis zone.

Environment/lithology: shallow subtidal; limestone

• the Cambrian sequence begins with the Nelson Limestone, a unit 600 to 700 feet thick, which lies with angular miconf ormity 011 the Patuxent Formation. Overlying the Nelson Limestone conformably is the Gambacorta Formation, a unit of volcanic and hypabyssal rocks more than 1,000 feet thick.

•Trilobites from the basal beds of member 3.

Size classes: macrofossils, mesofossils

Primary reference: A. R. Palmer and C. G. Gatehouse. 1972. Early and Middle Cambrian Trilobites from Antarctica. Contributions to the geology of Antarctica [W. Kiessling/M. Krause]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 153967: authorized by Wolfgang Kiessling, entered by Mihaela Krause on 21.01.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ptychopariida - Conokephalinidae
? Suludella spinosa Palmer and Gatehouse 1972 trilobite
 Ptychopariida - Ptychopariidae
"Nelsonia schesis" = Paleonelsonia schesis
"Nelsonia schesis" = Paleonelsonia schesis Palmer and Gatehouse 1972 trilobite