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University Geological Survey of Kansas. 
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Fic. aij Geologic Section at Great West- 
ern Gypsum Mine, Blue Rapids, show- 
ing Relation of Gypsum to Cottonwood 
Limestone. 
entry runs east of north and 
goes into the hill 400 feet. In 
the first 200 feet the gypsum 
was in rounded masses, thick 
at the middle and running out 
on the sides, with the trend 
across the entry and parallel to 
the slope of the hill, or south- 
east-north-west. The channels 
between these rounded masses 
appear to be old water courses. 
Two of the channels which 
have been explored in this 
mine for a distance of 200 feet 
are clearly water courses, and 
have on their floors a deposit of 
sand and mud. 
The section of the mine and 
hill above, Figure 2, shows 8% 
to 9 feet, of gypsum resting 
upon a brown crystalline lime- 
stone, and covered by 8 feet of 
red and blue shales similar to 
the Fowler mine. Over these 
shales there is a series of buff 
shales with two buff limestones 
20 and 40 feet above the gyp- 
sum. The hill which rises 100 
feet above the gypsum is 
capped by a buff fossiliferous 
limestone 380 inches thick, in 
three courses, and carrying a 
considerable amount of flint. 
A section one mile to the east 
of this mine, shown also in 
Figure 2, in a small ravine, 
known as Lovers’ Nook, where 
