THE KANSAS UNIVERSITY 

 SCIENCE BULLETIN. 



Vol. V, No. 14 ] MARCH, 1910. [vo"!xv,'.v" u 



AN ARMORED DINOSAUR FROM THE CRETACEOUS 



OF WYOMING. 



BY ROY L. MOODIE. 



(Contribution from the Zoological Laboratory, No. 190.) 



Plates LV to LIX, and one text figure. 



IN Science for October 20, 1905, Dr. S. W. Williston (1) pub- 

 lished a brief account of a remarkable armored dinosaur 

 from the upper Cretaceous of Wyoming. He likewise gave 

 a short sketch of the horizon from which the specimen was 

 obtained, naming the horizon Hailey shales, and suggesting 

 the name Stegopelta landerensis for the dinosaur. 



During the summer of 1906, while searching these beds for 

 plesiosaur remains for the Carnegie Museum {2) the writer 

 followed the horizon eastward and northward to the southern 

 end of the Big Horn mountains. The beds increase in thick- 

 ness towards the east and the lithological character becomes 

 different, changing from a soft fine shale in the west to a hard 

 sandy rock in the Big Horn region. The Hailey shales lie just 

 above and comformable on the Mowry beds, which Darton {3) 

 describes as follows : 



"The stratigraphic succession of the formation [Colorado] 

 is uniform throughout. The lowest beds are several hundred 

 feet of dark-colored shale, usually containing toward the base 

 a deposit of sandstone from 2 to 20 feet thick. This is capped 

 by the Mowry beds, consisting of from 100 to 150 feet of hard 

 shales and thin-bedded, fine-grained sandstone of a dark gray 

 color, which on exposure weathers to a characteristic light 

 gray. These rocks are especially characterized by large num- 

 bers of fish scales in nearly every bed. They are often so 



(257) 



