58 VALET Ss Tis (ELGT: 
beneath the Dakota in the canyon of the Huerfano River. In 
the next canyon to the east, the Apishapa, similar shales, and 
similarly placed, occur beneath the Dakota. Still further to the 
east and south, in the Purgatory and its branch canyons the 
same shale series occurs, bearing numerous Dinosaur bones of 
undoubted Morrison type. From thence southward to the Rio 
Cimarron and the Canadian the shales are lithologically and 
stratigrapically the same. It seems evident, therefore, that the 
shale formation throughout the region under consideration 
should be referred to the Morrison. It seems evident, further- 
more, that the Morrison originally extended uninterruptedly 
over the entire region examined. Since no evidence of diminu- 
tion in thickness was found, it is safe to assume that the forma- 
tion extends eastward and southward beyond this area. Whether 
they extend to the south and east and merge into the undoubted 
Lower Cretaceous, as previously suggested, remains as yet unde- 
termined. 
NV ets) lee 
TRINIDAD, COLO. 
