174 Screntifie Intelligence. 
Above the horizon of the Colorado group, the Fox Hill and 
Laramie are essentially of sandstones, about 9,000 feet in thick- 
ness in the region of the Wahsatch, about 3,000 feet in the region 
of the Great Plains. At the very summit of the uppermost or 
an rial or brackish-water life, associated with 
strictly Mesozoic Saurians. With the close of the Cretaceous the 
conformable se of marine and estuarial deposits east of the 
8 e to an end, and the last moments of deposition were 
Relatively to the present basin of the Colorado, the whole chain 
he Rocky i i 
Iver. Fowerful and important as this orographical movement 
was, it failed to disturb the coast deposits of the Pacific in Cali- 
ed 
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; From the date of this movement no marine waters have ever 
invaded the middle Cordilleras, and the subsequent strata are all 
covering the whole lapse of Eocene time. e 
Fortieth Parallel region was a period of four lakes superposed, 
the unconformity of their deposits due to four orographical dis- 
bances. 
