GRIMSLEY. | Gypsum Mines and Mills. 57 
acter of the gypsum and shales, so that the rock is dissolved out 
and covered by the crumbling debris from above. 
On the Yarrick farm one mile south of the town is a mine 
from which a small amount of gypsum was removed some years 
ago. The blocks which are piled around the entry are now 
badly weathered and bleached out so as to present a clear white 
color, and fissured with small seams. The fresher specimens 
show that the gypsum is about the same as in the other mines. 
The rock is 100 feet below the buff limestone on the hill above. 
Gypsum occurs in the shales in many of the ravines to the 
west of Blue Rapids, especially near Waterville, in the form of 
rounded nodules pink in color. At this last locality the nodules 
occur in a black shale of which 2 feet are exposed, and overlaid 
by 3 feet of blue shale and a 30-inch stratum of limestone. One 
hundred feet above is the buff limestone with flint nodules, 
which may be traced across the country. The gypsum lies 
about ten feet above the water in the Blue river. 
A similar exposure was noted on the John Morrow farm, 
about two miles east of Waterville or two miles west from Blue 
Rapids. At this place the pink gypsum nodules are imbedded 
in 12 feet of shales and near the water’s edge. Above comes 20 
feet of red and blue shales and limestone. 
The dip from Winter’s mine to Fowler’s, one and one-half 
miles north, is 12 feet, or 8 feet to the mile; and from the Yar- 
rick mine to the Great Western, a distance of two and one-half 
miles a little east of north, the dip is 18 feet, or 7 feet to the 
mile. The dip from the Great Western to the Winter mine, a 
distance of two and one-half miles west, is 18 feet, or 7 feet to 
the mile. The dip of the gypsum, then, in the vicinity of Blue 
Rapids is about 10 feet to the mile to the northwest. The dip 
from the Great Western mine to the exposure at Waterville is 
between 8 and 10 feet to the mile. 
Gypsum City Deposits. 
There are two well-marked gypsum rock horizons in the cen- 
tral Kansas area and indications of a third. The lower and 
more extensive deposit extends over the central, northern, and 
