According to the classification made by Hill, the Comanchean, or Lower Cretaceous, series in Texas and southern Oklahoma is divided into the Trinity, Fredericksburg, and Washita groups. In southwestern Kansas the Comanchean consists of the Cheyenne sandstone and Kiowa shales. The Kiowa formation, containing a Kiamichi fauna, is regarded by Bullard 2 as of Washita age.
The first record of the discovery of Comanchean dinosaur bones that I have been able to find is that made by R. T. Hill.3 The bones were found in the basal Trinity near Lambert, Parker County, Texas, some 35 miles west of Fort Worth. These bones, however, were not the first discovered. In a letter from Doctor Hill dated December 9, 1928, he says: “I found a saurian tooth in the Lower Comanchean near Comanche when I was a boy. It was taken to Cornell with me.” This tooth was . . .