@Olivier5,
sorry, these werent fishapods but small pre -dinosaurians like "Gralotor" . The Triassic was a time of evolutionary explosion of entire reptilan genera (until another mass extinction at the end of the Triassic wiped out not so many genera as the Permian Great extinction but sorta "trimmed" out the lines remaining.
East Coast US is full of Tr stuff right up to the end nd theres very little to no Jurassic rocks and sediment in the great Tr Basin.
One site that was visited nd movied was the bigass slab on the Pa prison at Graterford, that one shows a huge community of tracks separated by volcanic ash deposits, maybe 30 ft thick ( about 9m )