460 GEOLOGY OF THE DENVER BASIN. 



and no decrease had then been noticed. In 1890 data were unobtainable, 

 but the flow had doubtless ceased. The strata passed through are said 

 to be as follows: 



Feet. 



Gravel 96 



Clay 4 



Light and dark colored shale 308 



Sandstone (small How of water I 20 



Shale 172 



Sandstone (good flow of water) 30 



Clay and shale 50 



Sandstone (large flow of water) 20 



Total 700 



The Evans well, at the residence of ex-Governor Evans, Fourteenth 

 and Arapahoe streets, was sunk in 1886 to a depth of 1,140 feet; cost, 

 $3,000, exclusive of casing. It is cased to a depth of 765 feet with 3i-inch 

 and to a depth of 1,100 feet with 2£-inch casing. The strata passed 

 through are given as follows: 



Feet. 



Gravel 25 



Blue shale 339 



Iron pyrites 2 



White sand containing some water 370 



Blue shale 110 



White sand, water 10 



Shale 50 



White sand 90 



Blue-black shale 40 



White sand, wafer 20 



Shale, mineral '• blow in" at base 185 



White sand 20 



Brown shale .• 103 



Black quartz, under which some unpalatable 'water 15 



Grayish fire-clay 40 



Streaks of coal 47 



Clay 40 



Total 1,140 



At 1.100 feet a little oil came out with the coal. On account of bad 

 water in the lower measures boring was stopped and the casing pulled to 

 the 600-foot flow. 



