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interesting, but at this time such a correlation cannot be made with 

 any degree of accuracy. Shuler placed the Glen Rose tracks in 

 the middle third of the Glen Rose formation which at that locality 

 has an approximate total thickness of 315 feet/ In Hamilton 

 County the interstream divides are capped with basal Edwards 

 limestone containing an abundance of chert. The dinosaur 

 tracks are about 200 feet below the lowest chert bed. Immediately 

 beneath the Edwards limestone are the soft, chalky beds of the 



Fig. 4. — Dinosaur track of which dimensions are shown in Figure 5. 

 dusted with white powder.) (Photo by C. B. James.) 



(Track 



Walnut formation, eroded to form a wide, shallow valley, and in 

 the midst of this valley Cottonwood Creek has cut down slightly 

 into the Glen Rose beds. The upper limit of the Glen Rose could 

 not readily be determined in the immediate locality, owing to poor 

 outcrops, but it is tentatively placed about fifty feet above the 

 horizon of the tracks. This tentative correlation is not of much 

 assistance, however, as the total thickness of the Glen Rose is no- 

 where exposed nearby, and there are no reliable data upon which 

 to postulate thickness in this vicinity. The Glen Rose formation 



' R. T. Hill, Twenty-first Annual Report U.S. Geol. Surv., Part VII, p. 153. 



