514 A. G. LEONARD 



Feet 



Sandstone, massive, light greenish gray, weathers to yellow color 50 



Sandstone ledge, yellow 8-10 



Clay, sandy, finely laminated and formed of alternating light and dark 

 laminae. Contains nodules of iron pyrites. Exposed above creek 

 level 25 



In this upper sandstone, Dr. T. W. Stanton collected several 

 marine fossils characteristic of the Fox Hills, including Leda 



Fig. 2.— The Fox Hills and Lance formations on the Cannon Ball River. The 

 contact is at the hard ledge on which the man is standing. 



(Yoldia) evansi, Tellina scitula, Entalis? paupercula, and Haly- 

 menites major. 



Where exposed in bluffs along Little Beaver Creek, at several 

 points the gray sandstone shows an uneven, eroded surface, 

 which the writer has described as an unconformity. 1 It may, 

 however, be due to the action of currents in the shallow sea of 

 Fox Hills time, as suggested by Dr. Stanton, in which case no long 



1 Fifth Biennial Report, N.D. Geol. Surv., 44. 



