Talacasto Gulch (Ordovician of Argentina)

Where: San Juan, Argentina (31.0° S, 68.8° W: paleocoordinates 36.2° S, 130.6° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: San Juan Formation, Arenigian (478.6 - 468.1 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified wackestone and lithified lime mudstone

• argillaceous lime mudstone with thin skeletal wackestone beds in the lower part of the section, thin calcareous beds and marls (mudstones and skeletal wackestones) in the upper part

Size class: macrofossils

Primary reference: M. S. Beresi and J. K. Rigby. 1993. The Lower Ordovician sponges of San Juan, Argentina. Brigham Young University Geology Studies 39:1-63 [A. Miller/P. Novack-Gottshall/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 119460: authorized by Wolfgang Kiessling, entered by Uta Merkel on 27.10.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Demospongea
 Lithistida - Streptosolenidae
Hudsonospongia talacastensis n. sp. Beresi and Rigby 1993 demosponge
Aulocopium sanjuanensis n. sp. Beresi and Rigby 1993 demosponge
 Lithistida - Anthaspidellidae
Archaeoscyphia minganensis Billings 1859 demosponge
Archaeoscyphia nana n. sp. Beresi and Rigby 1993 demosponge
Talacastonia chela n. gen. n. sp. Beresi and Rigby 1993 demosponge
Anthaspidella inornata n. sp. Beresi and Rigby 1993 demosponge
Anthaspidella alveola n. sp. Beresi and Rigby 1993 demosponge
Anthaspidella annulata n. sp. Beresi and Rigby 1993 demosponge
Calycocoelia perforata Beresi and Rigby 1993 demosponge
Rhopalocoelia clarkii Raymond and Okulitch 1940 demosponge
Rhopalocoelia rama n. sp. Beresi and Rigby 1993 demosponge
Patellispongia robusta n. sp. Beresi and Rigby 1993 demosponge
Hexactinellida
  -
Hexactinellida indet. Schmidt 1870 glass sponge
Heteractinida
  -