A.C.Leonard 
eae Denn BEES 2S: 
Section at Sentinel Butte, North Dakota. 
ft. if. 
29. Alternating layers of highly 
calcareous clay and very 
fine-grained, compact, brittle 
gray limestone, finely lanfi- 
nated, and more or less sili- 
ceous. Some of the sandstone 
beds weather into thin lami- 
nae, one-sixteenth of an inch 
thiek and less 
Very calcareous gray clay, 
weathering to a ereenish 
color 
Gray hard sandstene AQ~= 
Gray and yellow sandy clay 
Brown, clay and aes seam 
of lignite 
Gray and yellow ES clays 
Lignite 
Soft, fine-grained argilla- 
ceous sandstone 
Brown and gray clay. 
taining many selen 
+ 
Soft, fine-grained : 
ay 
CO 
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ea) i a) 
Chi Or’ =F 
° & 
nS TD OY 
& 
no OD 
& 
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found 
® & 
tI OO 
e 
tO © 
Lignite 
Chocolate 2 
with carbonized wood 
Bluish-gray elay 
Gray 
int SO tt 5 & ds tone i 
Wot wall Rt pat but probably 
clay 
e 
J fe = 
CO 
& ¢ 
Oo ~ 
¢ 
jd 
77 
2 
i> 
¢ 
Do Oo 
= 

font fod boned been b+ 
& 
i 
& 
tO 
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