Oxygen-controlled Early Ordovician trilobite assemblages: the Thysanopyge Fauna from Northwestern Argentina

WAISFELD, B.G.; VACCARI, N.E.

Toledo

Congreso; International Trilobite Conference; 2008

The well known Thysanopyge fauna, formerly defined as a group of endemic asaphids that flourished during the Floian in western Argentina (Harrington and Leanza, 1957), is re-evaluated upon new insights into its composition, spatio-temporal distribution, as well as ecological and environmental aspects. Thysanopyge conforms an array of assemblages that are here differentiated by their trilobite composition, richness, and co-occurrence of other benthic groups. The particular geodynamic and environmental setting featured particular ecological and biogeographical signatures which are briefly discussed.