Shuler— Dinosaur Tracks in the Glen Rose Limestone. 295 



d) Limestone, white, indurated. Contains dinosaur 



tracks. '75^ calcium carbonate 2^ inches 



e) Limestone, sha]y, hard __. 4 inches 



/) Limestone, gray, impure 1 inch 



g) Limestone, shaly, yellowish gray 5 inches 



Fig. 1. 







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Fig. 1. Dinosaur tracks in the Glen Eose Limestone, near Glen Eose, 

 Texas. 



As given in the table above a chemical analysis of the lime- 

 stone layer {d) shows that it contains 75 per cent of calcium car- 

 bonate, while the shaly layer immediately above contains 33 

 per cent of calcinm carbonate. The layer below will probably 

 show more than 50 per cent calcinm carbonate. 



