Tordillo (Jurassic of Argentina)

Where: Neuquen, Argentina (38.9° S, 70.2° W: paleocoordinates 36.4° S, 32.1° W)

• coordinate estimated from map

When: Kimmeridgian (157.3 - 152.1 Ma)

• This formation was described by GROEBER(1946: 182) as "Tordillense" and constitutes the basal portion of the Andico Supergroup, just above the Inter-Upper Jurassic or Araucarian Unconformity ( LEANZAet al., 1977).

Environment/lithology: marginal marine; green, red, silty, conglomeratic sandstone

• This unit was deposited in a marginal marine (litto- ral) and a deltaic-fluviatil environment.
• The Tordillo Formation is composed of conglomerates, sandstones, siltstones and shales mostly ofdarkred, reddish and greenish colour.

Size class: macrofossils

Preservation: mold/impression

Collection methods: The species mentioned for this Fm were those mentioned by Lambert (1956), cited in the paper.

Primary reference: H. Leanza, A. Zeiss, A. Cione, W.C. Dullo, E. Flugel, J.I. Carate-Zubillaga, and Z. Gasparini. 1990. Upper Jurassic Lithographic Limestones from Argentina (Neuquen Basin): Stratigraphy and Fossils. Facies 22:169-186 [J. Alroy/J. Martinelli]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 135628: authorized by John Alroy, entered by Julieta Martinelli on 28.10.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Pectinoidae
Pecten sp. Müller 1776 scallop
 Trigoniida - Trigoniidae
Crinoidea
  -
Pentacrinus sp. Miller 1821 Sea lily