The dinosaur collections made over the past decade during the Hell Creek Project yielded new information from an improved genus-level collecting schema and robust data set that revealed relative dinosaur abundances that were unexpected, and ontogenetic age classes previously considered rare. We recognize a much higher percentage of "Tyrannosaurus" than previous surveys. "Tyrannosaurus" equals "Edmontosaurus" in U3 and in L3 comprises a greater percentage of the large dinosaur fauna as the second-most abundant taxon after "Triceratops", followed by "Edmontosaurus". This is surprisingly consistent in (1) the two major lag deposits (MOR loc. HC-530 and HC-312) in the Apex sandstone and Jen-rex sand where individual bones were counted and (2) in two thirds of the formation reflected in L3 and U3 records of dinosaur skeletons only.