Volcancito Formation, Upper Cambrian (Cambrian of Argentina)

Where: La Rioja, Argentina (28.9° S, 67.8° W: paleocoordinates 40.8° S, 127.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Lower Member (Volcancito Formation), Furongian (497.0 - 485.4 Ma)

• Upper Cambrian. Lower part of the "Lower Member" of the Volcancito Formation.

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; marl and sandstone

• outer shelf marls and intercalatioins of muddy sandstones.

Size class: macrofossils

Primary reference: M. F. Tortello and B. Esteban. 1999. La transicion Cambrico-Ordovicico en la Formacion Volcancito (sierra de Famatina, La Rioja, Argentina). Ameghiniana 36(4):371-387 [M. Patzkowsky/Z. Krug/Z. Krug]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 42518: authorized by Mark Patzkowsky, entered by Zack Krug on 31.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Trilobites and graptolites.
Trilobita
  -
"Sphaerocare" "globifrons" Harrington and Leanza 1957 trilobite
 Corynexochida - Leiostegiidae
"Bodenbenderia" "longifroms" Harrington and Leanza 1957 trilobite
 Agnostida - Agnostidae
Lotagnostus sp. Whitehouse 1936 trilobite
"Pseudorhaptagnostus (Machairagnostus) sp." = Neoagnostus Kobayashi 1955 trilobite
 Agnostida - Diplagnostidae
Pseudorhaptagnostus (Machairagnostus) tmetus Harrington and Leanza 1957 trilobite
Pseudorhaptagnostus (Machairagnostus) cf. tmetus Harrington and Leanza 1957 trilobite
 Olenida - Olenidae
Plicatolina scalpta Harrington and Leanza 1957 trilobite
Angelina hyeronimi Kayser 1876 trilobite
Parabolinella argentinensis Kobayashi 1936 trilobite
Parabolina (Neoparabolina) frequens Barrande 1868 trilobite
 Ptychopariida - Shumardiidae
Shumardia erquensis Kobayashi 1937 trilobite
 Asaphida - Asaphidae
Asaphellus riojanus Harrington and Leanza 1957 trilobite
 Asaphida - Remopleurididae
? Kainella conica Kobayashi 1935 trilobite
 Asaphida - Ceratopygidae
Onychopyge riojana Harrington 1938 trilobite
 Asaphida - Alsataspididae
Rhadinopleura eurycephala Harrington and Leanza 1957 trilobite