DETAILED RECORDS. 215 
IOWA. 
457. "Well at "Waterloo, 151aekhawk County. 
[Well begun in October, 1904; completed in June, 1905. Authority, Waterloo Water Company, owner. 
Log compiled from samples by S. Sanford. Geologic correlations by E. O. Ulrich.] 
This record is of unusual interest, since it shows a remarkably close agreement with the 
hypothetical depths of the various strata given by Prof. W. H. Norton in a contribution 
to Water-Supply and Irrigation Paper No. 145, written some months before drilling began. 
No samples were saved to 100 feet, the well being sunk to that point through clay, 
lime rock, and quicksand streaks, the material caving badly and making progress slow. 
The formations represented by samples are, to follow Norton's classification: Devonian 
limestone and shale, Niagara limestone (Silurian); Hudson (or Maquoketa) shale, Galena 
and Platte ville limestone, St. Peter sandstone, Oneota limestone (Ordovician), Jordan 
sandstone, St. Lawrence dolomite (Cambrian). 
Record of city well at Waterloo. 
Devonian: Feet. 
Brownish limestone with quartz grains and pebbles 100- 120 
Brownish limy sandstone 120- 126 
Silurian: 
Light-buff cherty limestone 131- 143 
Brownish limestone, sandy in places and cherty 152- 240 
Gray limestone 240- 245 
White to brownish limestone 245- 255 
Reddish-brown sandy limestone 255- 259 
Maquoketa: 
Brownish limestone and gray limy shale 259- 265 
Gray limy shale, in places brownish 265- 425 
Galena and Platte ville: 
Brownish limestone 440- 605 
White to reddish limestone 605- 635 
Soft brownish and grayish limestone 635- 815 
St. Peter- 
White and gray sandstone 815- 862 
Brownish limestone and gray sandstone 862- 900 
Oneota: 
White to brown limestone, in places sandy 900- 980 
White sandstone 1, 030-1, 045 
Light-buff magnesian limestone 1, 045-1, 060 
White limy sandstone 1, 065-1, 070 
Brownish limestone, in places sandy 1, 075-1, 205 
Jordan: 
Brown to gray limy sandstone 1, 205-1 , 235 
Light-brown sandstone 1, 235-1, 253 
Brownish sandy limestone 1, 253-1, 302 
St. Lawrence: 
White and brownish magnesian limestone 1, 302-1, 373 
Diameter of casing, 15 inches to 200 feet: 9 inches to 470 feet. Diameter of well below, 
! 8 inches. First flow at about 840 feet amounted to about 75 gallons per minute, with a 
head above street grade of about 18 feet. The flow remained stationary till a depth of 
1,362 feet was reached, when there was a considerable increase and the head rose to 20 
feet. The flow is about 200 gallons per minute. The well is pumped by a deep-well cen- 
trifugal pump and yields 700 gallons per minute. Temperature of the water at well mouth, 
56° F. 
