Talacasto [upper San Juan Fm] (Ordovician of Argentina)

Where: Argentina (30.8° S, 68.8° W: paleocoordinates 34.8° S, 132.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Eoplacognatus suecicus conodont zone, Los Azules Formation, Darriwilian (467.3 - 458.4 Ma)

• STRATIGRAPHIC RELATIONS: From the San Juan Fm, for which lithostratigraphic relationships are not discussed. AGE: Whiterockian. STRATIGRAPHIC POSITION: From the upper part of the formation.

•Bertero (f. 2) shows that this part of the old San Juan is now called the Los Azules formation. Also, stage now given as Darriwilian.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, nodular limestone

• SPECIFIC LITHOLOGY: Nodular limestone. LITHIFICATION: Lithified, on the basis of figured specimens and facies description.

Size class: macrofossils

Collected by Carrera

Collection methods: bulk,

• COLLECTOR: Carrera, presumably in the early 1990's. REPOSITORY: Catedra de Estratigrafıa y Geologıa Historica, University of Cordoba.

Primary reference: M. G. Carrera. 2000. Epizoan-sponge Interactions in the Early Ordovician of the Argentine Precordillera. Palaios 15:261-272 [A. Hendy/A. Hendy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 90431: authorized by Austin Hendy, entered by Austin Hendy on 20.07.2009, edited by Uta Merkel

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to sponges and associated epibionts. NOMENCLATURE: Not an authoritative publication, but with modern nomenclature and species-resolution identification where possible.
Brachiopoda
  -
Brachiopoda indet. Cuvier 1805
unclassified
  -
Annelida indet. Lamarck 1809
Bryozoa
  -
Stenolaemata
 Trepostomata -
Trepostomata indet. Ulrich 1882
unclassified
  -
Pelmatozoa indet. Leuckart 1848
Porifera indet. Grant 1836
Demospongea
 Lithistida - Streptosolenidae
Hudsonospongia cyclostoma Raymond and Okulitch 1940 demosponge
 Lithistida - Anthaspidellidae
Archaeoscyphia tenuis Carrera 1994 demosponge
Archaeoscyphia pulchra Bassler 1927 demosponge
Rhopalocoelia clarkii Raymond and Okulitch 1940 demosponge
Patellispongia oculata Bassler 1927 demosponge
Patellispongia robusta Beresi and Rigby 1993 demosponge
Patellispongia argentina n. sp. Carrera 1994 demosponge