



Section in the bluffs of the Little Missouri at Medora, N. Dak.a 
Ets in. 
40. Shaly sandstone, gray, weathering to yellow, finer grained than No. 39; 
CENA SWE SSO) 01. ae el Co ad a ae AO cM eA AAD ys el te ME 15 
39. Sandstone, dark gray, rather soft, coarse grained, massive; forms 
vertical escarpment near top of bluff 
ic reg DECCAN IEC uc n Ser Wate Sto etd SUA ie = ae: eae Sinem naka See oo 
37. Clay shale, gray and yellow 
. Lignite seam 
Clay shale 
. Gray, fine-grained, shaly sandstone 
Yellow clay shale 
32. Lignite seam 
Gray clay shale 
xray sandy shale 
. Gray clay shale 
. Chocolate-brown clay shale, with thin lignite seam 
. Gray clay shale 
Soft shaly sandstone, gray and bluff, laminated, fine grained; in places 
forms hard sandstone ledge projecting beyond the softer shales above 
and below 
. Lignite 
. Gray and yellow clay shale 
. Chocolate-brown shale 
Lignite 
. Chocolate-colored clay shale with abundant 
stem impressions 
. Gray clay shale 
. Sandy shale and fine-grained sandstone 
2. 
if. 
Gray clay shale, not 

