452 GEOLOGY OF THE DEXVEE BASES'. 



The' decrease is supposed to have been due partly to the sinking of 

 other wells in the vicinity and partly to clogging with sand. This well in 

 December, 1890, was pumping 3,000 gallons per hour. 



24. The Windsor Hotel well, at the corner of Eighteenth and Larimer 

 streets, was completed August 30, 1883. The depth was originally 530 

 feet, but in 1886 it was considerably increased. The well was originally 

 cased for 10 feet with a 10-inch drive-pipe, and for 480 feet with 5§-inch 

 and 495 feet with 4^-inch ordinary casing. The size below this was not 

 learned. No packing was used. In the early well two large flows were 

 cut, the first at 342 feet with a head of 25 feet, and the second at 515 feet 

 with a head of 60 feet. Both were utilized. Their original discharge was 

 about 300,000 gallons per day. This, November 10, 1883, had decreased 

 to 182,908 gallons; November 14, 1883, to 180,417 gallons; in March, 1884, 

 to 96,580 gallons; on May 6, 1884, to 54,697 gallons; on June 6, 1884, to 

 46,180 gallons; on August 5, 1884, to 21,792 gallons; and in February, 

 1886, to 17,581 gallons. In December, 1890, the well had long been 

 pumped, the water-table then being 92 feet beneath the surface. 



The strata passed are given as follows: 



Feet. 



To bed rock 14 



Soft sand at 53 



Indurated clay at 65 



Black shale at 138 



Indurated clay at 113 



Water-bearing sandstone at 181 



Blue, indurated clay at 153 



Water-bearing sandstone at 235 



Blue, indurated clay at 245 



Alternate layers of clay and sandstone to 285 



Hard, white, water-bearing sandstone at 285 



Blue, indurated clay at 300 



Mixture of indurated clay and sand at 302 



Water-bearing sandstone at 305 



Soft, coarse sandstone (first large flow) at 335 to 345 



Coarse gravel at 394 



Blue, indurated clay at 397 



Hard sandstone at 407 



Blue clay at 425 



Hard sand and heavy How at 515 



Loose sand and sandstone at 530 



