A new occurrence of the ichnogenus Brachychirotherium: implications for the Triassic-Jurassic mass extinction event
Abstract--New excavations at the Friendship Home locality in the Exeter Township Member of the Passaic Formation have uncovered numerous vertebrate footprint horizons. This site contains the palynologically-defined Triassic-Jurassic boundary. Ichnotaxa discovered here include Brachychirotherium spp., Grallator spp., Rhynchosauroides sp., and two proposed new taxa. The discovery of abundant Brachychirotherium within four meters of the Triassic-Jurassic boundary is believed to be especially significant since this ichnogenus is unknown in post-Triassic strata worldwide. This and other ichnological data from the study site support the hypothesis of an abrupt extinction event at the Triassic-Jurassic boundary.

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