"deinosuchus" was present on both sides of the western interior seaway. specimens have been described from 10 u.s. states: utah, montana, wyoming, new mexico, new jersey, georgia, alabama, mississippi, texas, and north carolina. david schwimmer has said "deinosuchus" fossils have been found in south carolina and delaware as well, but none of them from those two states have been formally described. a "deinosuchus" osteoderm from the san carlos formation was also reported in 2006, so the giant crocodilian's range may have included parts of northern mexico. there is also a report describing a possible "deinosuchus" scute from colorado. "deinosuchus" fossils are most abundant in the gulf coastal plain region of georgia, near the alabama border. all known specimens of "deinosuchus" were found in rocks dated to the campanian stage of the late cretaceous period. the oldest examples of this genus lived approximately 82 ma, and the youngest lived around 73 ma.