The Permian-Triassic extinction recorded in Italian rocks

[Halichoeres]

Renato Posenato reviews the faunas of the Permian and Early Triassic as recorded in the Italian alps, which doesn't explain the cause, but shows a pretty good progression from Paleozoic faunas to the "disaster fauna," the depauperate, miniaturized community of marine invertebrates that persisted through the extinction event, to the eventual increase in diversity more than a million years later.

In this diagram he shows where particular taxa can be found, in layers of sediment that have been turned sideways by tectonic activity:



Open access in Bollettino della Società Paleontologica Italiana: http://paleoitalia.org/media/u/archives/03_Posenato_2019_BSPI_581.pdf