216 RECORD OF BEEP-WELL DRILLING FOR 1905. 
461. Well at Charles City, Floyd County. 
[Well begun in December, 1904; completed in May, 1905. Authority, W. Dennis, city clerk. Logcom-j 
piled from samples by S. Sanford. Geologic correlations by E. O. Ulrich.] 
This well is sunk through rocks of Devonian, Silurian, Ordovician, and Cambrian age. 
The formations in order are Devonian limestone and shale, Silurian limestone, Maquoketa 
shale, Galena and Platteville limestones, St. Peter sandstone, Oneota limestone with 
included New Richmond sandstone, Jordan sandstone, and St. Lawrence limestone and 
shale. 
Record of city well at Charles City. 
Devonian: Feet. 
Brownish limestone 14 - 30 
Brownish shaly limestone 40- 50 
Light-buff sandy limestone 50- 70 
Gray, brown, and buff sandy limestone 70- 80 
Gray limestone, fossiliferous 80- 90 
Brown and gray shaly limestone 90- 100 
Gray limy shale 100- 120 
Silurian: 
Brown cherty limestone 120- 130 
Brown limestone 130- 160 
Maquoketa: 
Gray and brown limestone, fossiliferous from 220 to 270 feet 160- 290 
Gray limy shale 290- 310 
Galena and Platteville: 
Drab limestone, more or less magnesian, fossiliferous at 410 feet 310- 460 l 
Brownish-gray magnesian limestone 460 - 470 of 
Brown magnesian limestone, fossiliferous 470- 490 l! j 
Light-brown cherty limestone 500- 510 (I 
Brownish magnesian limestone 510- 540 I 
White, brownish, and grayish, more or less magnesian limestone 540- 630 ' 
Gray shah" limestone 630- 690 
Gray limy shale, fossiliferous 690- 700 
Gray shale, limestone, and sandstone 700- 730 
Gray shaly sandstone, slightly limy 730- 780 j 
Gray shaly sandstone and gray shale 780- 790 
White to gra}' porous sandstone with streaks of gray shale 790- 800 
Brownish and gray sandstone and limestone and gray shale 800- 820 
St. Peter: 
White sandy limestone 820- 84C 
White sandstone. 840 r S7C 
Shakopee: 
White, brown, and gray magnesian limestone 870- 90( 
New Richmond: 
White limy sandstone, magnesian cement 90C- 95( 
White sandstone and gray magnesian limestone 950- 971 
Oneota: 
Light-gray and brownish magnesian limestone 970-1 , 03' 
Light-drab magnesian limestone 1 , 030-1 , 04 
White and brownish limestone 1 , 040-1 , 07 I 
Brownish cherty magnesian limestone 1 , 070-1 , 08 'J 
White to brownish magnesian limestone 1, 080-1, 14 V, 
Light brown and white magnesian limestone 1, 140-1 , 11 1 
Brownish magnesian limestone 1, 150-1 , 1£ 1 
