GRIMSLEY. | Gypsun. Mines and Mills. 61 
OTHER EXPOSURES. 
The lower gypsum horizon which, for convenience of descrip- 
tion, may be called the Solomon gypsum, outcrops a quarter of 
a mile south of the Dillon mill, where a section of 5 feet of rock 
is exposed, covered with 5 feet of dirt. This locality is two 
miles west of the Hope shaft and the rock is 10 feet lower. Fif- 
teen miles west of the Dillon outcrop, in a well near the Tinkler 
earth deposit at Gypsum City, rock gypsum is found 60 feet 
lower. This same gypsum rock outcrops along the east bank of 
‘Gypsum creek, with about 3 feet of white granular gypsum ex- 
posed. It may be seen at various places along the north and 
south line from Gypsum City to Solomon, and at nearly the 
same levels. Similar outcrops are found in the Holland creek 
area. South of Gypsum City and west of Gypsum creek no 
trace was found of gypsum, either in outcrops orin wells. The 
upper gypsum, as exposed in the Hope quarry, is found on the 
higher levels to the west and north. It is found seven miles 
southwest, on the Henquenet farm, at the gypsum cave, shown 
in Plate XVII. The entrance to this cave trends southwest and 
it has a hight of 3 feet, with the same breadth, but soon nar- 
rows. This cave has been followed for several hundred feet, 
and so was explored by anumber of men. It has attracted much 
interest among the people of that region, on account of a local 
tradition that large sums of money and valuable treasure were 
stored in it by a band of robbers. So far, this hidden treasure 
has been undisturbed, though each year new adventurers vainly 
seek the unknown golden nook. 
The lower 8 feet of the gypsum is veined and spotted, and 
the polished slabs bear some resemblance to onyx, while the 
upper 2 feet exposed is fine grained and compact, like alabaster. 
This layer is covered by 15 feet of shales and 10 feet of the buff 
shaly limestone. A small stream flows into this cave after 
heavy rains, and the outlet is not known. ‘This cave is con- 
tinued eastward for sixty feet as a ravine, with gypsum walls, 
while the roof has caved in and for a considerable distance has 
been removed. No other caves are found in this region, but 
