from: Journal of Vertebrate Paleontology,
v. 23, supplement to no. 3, p. 102A
LIFE AND DEATH IN THE LATE TRIASSIC: AN
EXTRAORDINARY TETRAPOD ASSEMBLAGE FROM THE NEWARK SUPERGROUP OF NORTH CAROLINA
SUES,
Hans-Dieter, Carnegie Museum of Natural History, Pittsburgh, PA; CARTER,
Joseph, University of North Carolina, Chapel Hill, NC; OLSEN, Paul, Columbia
University, Palsades, NY; NOVAK, Stephanie, PEYER, Karin, University of North
Carolina, Chapel Hill, NC.
An
extraordinary tetrapod assemblage has been recovered from Upper Triassic red
flu-vial mudstones of ³Lithofacies Association II² of the Deep River Basin
of the Newark Supergroup near Raleigh, NC. It provides a unique snapshot of
trophic interactions between Triassic tetrapods. A well-preserved partial
skeleton of a rauisuchian (Postosuchus sp.)
has gut contents comprising a partial skeleton of a small aetosaur (Stegomus
sp.), a snout and limb-bones of a juvenile traversodont cynodont,
a partial dicynodont digit, and a dermal bone of an indeterminate temnospondyl.
Beneath the torso of the rauisuchian, a nearly complete skeleton of a new taxon
of sphenosuchian crocodylomorph was preserved. The latter specimen shows bite
marks to the head and neck, which match the teeth of the rauisuchian in size.
This association supports the interpretation of rauisuchians as top
predators in Late Triassic continental ecosystems. Associated teeth attest
to scavenging of the rauisuchian by phytosaurs, and Scoyenia
burrows near and through some bones indicate additional scavenging
by arthropods.
Preliminary
paleomagnetic data support an early Norian age for the new tetrapod assemblage.
The composition of this assemblage is consistent with other data indicating
that terrestrial faunal change at the Carnian-Norian boundary was not as marked
as previously claimed.