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Probainognathus
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== Paleoecology == ''Probainognathus'' was collected from the Chañares Formation in La Rioja Province, Argentina.<ref name="Romer1970"/> This locale is known for its preservation of [[tetrapods]], which are largely [[fossilized]] in volcanic [[concretions]].<ref name="Rogers">{{cite journal |author=Rogers, R., A. B. Arucci, F. Abdala, P. C. Sereno, C. A. Foster, C. L. May |year=2001 |title=Paleoenvironment and Taphonomy of the Chañares Formation Tetrapod Assemblage (Middle Triassic), Northwestern Argentina: Spectacular Preservation in Volcanogenic Concretions |url=https://www.losabdala.com/fernando/curriculum-vitae/publications/47-paleoenvironment-and-taphonomy-of-the-chanares-formation-tetrapod-assemblage-middle-triassic-northwestern-argentina-spectacular-preservation-in-volcanogenic-concretion |journal=PALAIOS |volume=16 |issue=5 |page=461-81 |bibcode=2001Palai..16..461R |doi=10.1669/0883-1351(2001)016<0461:PATOTC>2.0.CO;2 |s2cid=129192126|url-access=subscription }}</ref> When ''Probainognathus'' inhabited this area, it is thought to have been a [[lacustrine]] region within a [[rift basin]] that got a large influx of sedimentary debris and [[volcanic ash]].<ref name="Rogers"/> Various pieces of evidence suggest tetrapod mass mortality was the cause of death in the Chañares Formation.<ref name="Rogers"/> Fossils of both young and adult specimens were found at this locale, and these are not limited to ''Probainognathus'', but rather represent many [[taxa]] that fell victim to the event. There is also an unusual concentration of [[herbivores]], [[carnivores]], and [[omnivores]] in this formation. Numerous fossils of each type were 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.<ref name="Rogers"/> 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.<ref name="Rogers"/> 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.<ref name="Rogers"/> {{clearboth}}
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