found in close proximity to one another, despite the fact that this intermingling would normally be uncommon. It has, subsequently, been suggested that this unusual distribution of specimens could be due to the death event leaving these animals stranded with no other place to go, perhaps along a waterfront of some kind. The evidence at hand, especially the nature of volcanic preservation, has led to the postulation that volcanism played a role in the death event in some capacity. Suggested events include a large outpouring of ash, lethal gas surges, or, more likely, volcanism-induced flooding. Volcanic activity may have caused damming or other water diversion, which led to major widespread flooding in the area, and the death of Probainognathus and other tetrapods. Unfortunately, however, it remains uncertain whether volcanism was the direct cause of this major death event, or if it just aided in preservation after the fact. References Prehistoric probainognathians Prehistoric cynodont genera Carnian genera Late Triassic synapsids of South America Fossils of Argentina Triassic Argentina Chañares Formation Fossil taxa described in 1970