24 CEMENTS, LIMES, AND PLASTERS. 



have a thickness of 33 feet, exclusive of the 10-foot parting of shale 

 between them, but this thickness diminishes somewhat northward and 

 rapidly southward." 



Texas. "The largest area in Texas containing deposits of gypsum 

 lies east of the foot of the Staked Plains, in northern Texas. The beds 

 have an approximately northeast-southwest strike and extend from Red 

 River to the Colorado in an irregular line, the sinuosities of which are 

 produced by the valleys of the eastward-flowing streams. This belt 

 is a continuation of the deposits in Oklahoma. 



"In the eastern part of El Paso County, to the east of Guadaloupe 

 Mountains, there is an area of gypsum which extends beyond the bor- 

 der of the State northward into New Mexico. It lies north of the 

 Texas-Pacific Railroad and west of Pecos River. In a few localities 

 this great plain of gypsum is overlain by beds of later limestone and 

 conglomerate. The gypsum is conspicuously exposed along the course 

 of Delaware Creek, a stream rising in the foothills of the Guadaloupe 

 Mountains and flowing eastward into the Pecos. 



"In the Malone Mountains in El Paso County there is a third area 

 which contains notable deposits of rock gypsum. This locality has 

 the advantage of being situated near the Southern Pacific Railway." 



Utah. "The more important known deposits occur in the central 

 and southern portions of the State, in Juab County, east of Nephi; in 

 Sanpete and Sevier counties, near Salina; in Millard County, at White 

 Mountain, near Fillmore, and in Wayne County in South Wash. They 

 are all of the rock-gypsum type, except the one near Fillmore, which is 

 in the secondary form of unconsolidated crystalline and granular gypsum 

 blown up from dry lakes into dunes. Deposits are also known 

 in Emery County, about forty miles southeast of Richfield; in Kane 

 County, near Kanab; in Grand County, between Grand River and 

 the La Sal Mountains ; in Sanpete County, near Gunnison ; in the eastern 

 part of Washington County (?), between Duck Lake and Rockville, 

 and at other places. Recently enormous deposits of gypsum have 

 been reported from Iron County, at points so far from lines of trans- 

 portation, however, as to render their exploitation impracticable for 

 the present." 



Virginia. All the workable gypsum deposits of Virginia occur in 

 Washington and Smyth counties, in the valley of the North Fork of 

 Holston River. The area within which the known deposits are located 

 is a narrow belt about sixteen miles in length, extending from a short 

 distance southwest of Saltville to a point about three miles west of 

 Chatham Hill post-office. 



