DIVISION OF VERTEBRATE PALEONTOLOGY— GILMORE 321 



Oamptosaiinis, Ceratosaumis, and Antrodemus (AUosaurm) . 

 These Morrison dinosaurs came from two widely separated regions : 

 (jarden Park in the vicinity of Canyon City, Colo., and near Como, 

 Albany County, Wyo. In both instances fossil quarries were de- 

 veloped that produced specLmeiis for several successive seasons. At 

 Canyon City the fossils occurred in a thick sandstone layer, and this 

 deposit was worked from 1883 to 1887, inclusive, under the direction 

 of M. P. Felch. It was from this quarry that the articulated type 

 specimens of Ceratosauniis nasicoimis and Stegosaurus stenops and 

 an articulated skeleton of Antrodemus fragilis were obtained. 



In the Como region the famous Quarry 13 and Quarry ISi/o were 

 fcund by William H. Reed, in 1879. The former was worked for the 

 Government for a part of 1882 by Mr. Reed ; in 1883 by J. L. Kenney ; 

 and from 1884 to 1887 by Fred Brown. It is one of the few known 

 quarries that have produced quantities of stegosaurian and campto- 

 saurian bones. The following types were obtained here : Stegosaurus 

 sulcafu-s Marsh, Diracodon laticeps Marsh, Camptosawru^ nanus 

 Marsli, and C. hrowni Gilmore, all in the National Museum. 



Quarry 9 at Como Bluff, famous because of the occurrence of 

 Jurassic mammals, was worked for a number of seasons by Pro- 

 fessor Marsh's parties, but for the Government from 1883 to 1885 

 by Ed. Kennedy and W. Beck. The specimens obtained are, there- 

 fore, divided l:)etween the Peabody Museum of Natural History and 

 the United States National Museum. 



The Upper Cretaceous part of the collection was largely from the 

 Lance Creek area of Converse (now Niobrara) County, Wyo., made 

 under the direction of John B. Hatcher during the years 1889 to 

 1892, inclusive, and consisted principally of skulls and skeletal parts 

 of the large horned ceratopsian and hadrosaurian dinosaurs. Even 

 more valuable scientifically was the large series of teeth and jaws of 

 the small mammals of this period, among which were many types. 



Of lesser importance were small collections made b)^ ]\Ir. Hatcher 

 in 1887 from the Upper Cretaceous of the Denver Basin, and in 1888 

 from the Upper Cretaceous Judith River formation in Montana and 

 Arundel formation in Maryland, each of whicli contained several 

 type specimens. 



The Oligocene part of the collection made under the direction of 

 Mr. Hatcher covered the period from 1886 to 1890, and the greater 

 number of specimens came from the Chadron formation of western 

 Nebraska (Sioux County) and the Badlands of Washington County, 

 S. Dak. Of the Brontotheres alone there were 158 skulls and jaws 

 representing many types, besides much slceletal material. The fauna 

 of the Brule was scantily represented. Tlie Miocene and Oligocene 

 were represented by a season's collection of 15 boxes of materials 



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