U. S, GEOLOGICAL SURVEY BULLETIN 613 PLATE V 
ten 
4. MESAS OF TIMPAS LIMESTONE, BLOOM-THATCHER REGION, COLO. 
Below the limestone caps are slopes of shale (Carlile) to a wooded bench of Greenhorn limestone. Dakota 
sandstone forms foreground. 
B. TYLOSAURUS. 
A mososaur, or great marine lizard, from the chalk beds of the Niob fi i i 1 western Kansas, Restoration 
by C, R. Knight. 
