360 W. E. W RATHER 



general shape of the tracks seems to be sHghtly different. After 

 examining one of the Somervell County tracks, now in the museum 

 of Southern Methodist University at Dallas, it is noticeable that 

 the heel prints shown in Figures 3 and 4 are proportionately longer, 

 narrower, and usually much better developed than in the Glen 

 Rose tracks. The shape of the heel is shown quite clearly in 

 Figure 4. This difference may be due to the fact that the animal, 

 when walking, did not press down heavily on the heel, but carried 

 the weight thrown forward on the toes. The Glen Rose tracks were 

 quite certainly made by an animal in motion, while those in Hamil- 

 ton County, with the better development of the heel, may have 

 been made in more of a resting position. It would be interesting 

 to make a comparison of a number of the Hamilton County tracks, 

 to see whether this difference is characteristic of all the tracks 

 found there. 



Dinosaur tracks, exclusive of those found in the Texas Cre- 

 taceous, have usually been preserved in sandstone which clearly 

 indicates littoral deposition. The tracks were evidently made by 

 animals walking along a wet, sandy beach or in very shallow 

 water. Shuler adequately discussed this problem in the paper 

 referred to above, and the writer concurs in the conclusions there 

 set forth. The tracks seem to have been made in a soft or plastic 

 ooze which was probably covered by several feet of water. This 

 *'lime mud" was probably deposited in broad, shallow, quiet seas, 

 relatively free from currents. There is no noticeable amount of 

 sand in the immediately associated strata. Blue-clay shales carrying 

 selenite crystals occur for at least fifteen feet above and three or 

 four feet below the limestone, and in the overlying shales are thin 

 lenses of coquina bearing a typical Glen Rose fauna. 



Mr. C. B. James, of Hamilton, who called the writer's attention 

 to the locality, sent a brief description of the Hamilton County 

 tracks, accompanied by photographs, to the Smithsonian Institu- 

 tion, and in a reply C. W. Gilmore wrote: 



These are in all probability the footprints of one of the large three-toed 

 dinosaurs. Similar footprints have been reported to the authorities of the 

 Institution from near Glen Rose, Texas. The fossil remains of an animal 

 known as Trachodon, have been found in Cretaceous rocks of Texas, which 

 are of sufficient size to have made such tracks as those depicted. 



