188 T. W. Stanton— Fox Hills Sandstone. 



the sea became shallow the effect of tidal currents and wave 

 action was shown in irregular deposition, cross-beddinjy and 

 local erosion, and when an area was elevated above tide the 

 deposits formed were subjected to all the varying conditions 

 of flood plains, deltas and marshes. It would depend on the 

 configuration of the coast, the topography and drainage of the 

 adjacent land and the rate of elevation whether at any 

 particular locality the last marine bed would be covered by a 

 brackish-water deposit or followed immediately by land con- 

 ditions. With such a history it is not surprising that the Fox 

 Hills sandstone varies considerably in thickness and shows 

 somewhat varying relations with the overlying formation. 



The bearing which the facts here presented have on the 

 Laramie problem is self-evident. If it is trne that there is, a 

 transition with practically continuous sedimentation from the 

 Fox Hills sandstone into the Lance formation in the region 

 discussed, then tlie Lance formation includes or forms part of 

 the Laramie. 



