During the grant period three data gathering trips were conducted: to the Queen Charlotte Islands, Triassic-Jurassic boundary site, with David Kring and others; to the Permian Triassic boundary in South Africa, with Roger Buick; and to the Newark Basin Triassic-Jurassic boundary site. Paleontological, isotopic, and chemical studies of all three sites are either under way in our labs or now completed. In the Queen Charlotte Islands we established that ammonites disappear at the T/J boundary as defined by Radiolaria and a major carbon isotope excursion. In the Karoo we have preliminary evidence that the P/T extinction occurred at different times on land and in the sea. No results have yet been obtained for the Newark site.