8 SMITHSONIAN INSTITUTION 



mains of armored and trachodont Dinosauria new to the fauna and 

 additional skull material of horned forms. A large part of one cera- 

 topsian skull, badly checked, was discovered in a patch of exposures 

 about midway along the west side of North Horn Mountain, and 

 later a second skull portion of this type was found around toward the 

 southeast part of the mountain. 



In the latter part of the season investigation was made of several 

 large exposures of the Cretaceous in Dragon Canyon, notably a lo- 

 cality in the lower part of the canyon which has now produced the 

 remains of an astonishing array of large lizards, particularly re- 

 markable since Cretaceous lizards were so poorly represented prior 

 to discovery of the material at this locality in 1937. Remains of no 

 less than 22 individuals were added to the collection this season, and 

 it is anticipated that many of these, when completely prepared, will 

 prove to include good portions of the skeleton. 



Further investigation of the Paleocene deposits, principally those 

 in Dragon Canyon, has added a number of new forms to the fauna, 

 and has resulted in the discovery of a new locality, some distance to 

 the west of the badland area previously worked. Material from the 

 new locality was found to occur at two horizons, the upper of which 

 appears to be equivalent to the fossiliferous Dragon horizon at the 

 locality worked in previous years, whereas the lower level may be 

 as old as the Puerco, as this stage of the Paleocene is represented in 

 New Mexico. 



Among the forms recognized in the Paleocene collections of this 

 year, primitive mammals known as multituberculates, taeniodonts, 

 and periptychids are representative of groups which became totally 

 extinct in remote time. Remains found of other primitive types, such 

 as insectivores and carnivores, belong to orders of mammals that 

 have representatives in the living fauna. Included also were a notable 

 variety of condylarths — archaic types that may have included the 

 stems of our modern ungulates. The condylarths here represented 

 were for the most part small animals, the diversification of which 

 during Paleocene time must have been comparable to that of rodents 

 in the living fauna. 



By the early part of August about all the promising-looking ex- 

 posures of Cretaceous and Paleocene rock around North Horn Moun- 

 tain and in Dragon Canyon had been prospected, and there remained 

 only the task of building boxes and packing the season's collection. 

 This was done at a lumberyard in Price, which, being on a railroad, 

 made a convenient shipping point. The field season was terminated 

 there on August 12. 



