Abstract
The extinctions of amphibians and reptiles that accompanied the transition from Triassic to Jurassic times were so numerous and involved so many taxonomic units that they must be regarded as of considerable significance to the paleontologist. The -continuation of tetrapod life from Triassic into Jurassic times was largely through the advent of new taxonomic groups within certain orders rather than through the continuation of families and lesser taxa from the earlier into the later period.