DETAILED RECORDS. 185 
|j Helderberg: , Feet. 
Hard black shale and gray flinty limestone .' 103-1 12 
Hard brownish cherty limestone 112-117 
Hard black shale and gray and brownish cherty limestone 117-135 
Hard brownish cherty limestone and gray shale. 135-139 
Brownish cherty limestone with black shale 139-148 
Soft gray limy shale 148-152 
Hard greenish shaly limestone and black shale. 152-156 
Hard gray limestone and greenish limy shale 156-165 
Clifton: 
Soft gray shaly limestone and calcareous shale 165-170 
Hard dark-gray and greenish calcareous shale and white and gray shaly lime- 
stone. 170-182 
Hard dark calcareous shale and gray and brownish limestone 182-190 
Hard gray and brownish limestone and black calcareous shale 190-196 
Hard dark-gray and brownish limestone 196-200 
Hard gray and greenish limestone 200-204 
Hard dark-gray limestone 204-212 
Soft gray and greenish limestone . 212-220 
Soft gray and greenish limestone and gray shale 220-230 
Fernvale : 
Soft gray limestone and reddish shale . 230-245 
Soft greenish and reddish limestone and brown shale 245-250 
Hard greenish and reddish shaly limestone 250-255 
Soft greenish and reddish limestone and reddish calcareous shale 25.5-260 
Hard gray limestone and greenish and reddish shaly limestone 260-265 
Leipers to "Trenton:" 
Hard gray limestone 265-275 
Hard gray and brownish shaly limestone 275-285 
Hard gray and brownish limestone and calcareous shale 285-290 
Hard gray limestone 290-320 
Soft gray shaly limestone 320-350 
Soft gray limestone 350-391 
Rig used, standard. Diameter- of well, 8 and 6| inches. Show of oil at 148 feet. Show 
of gas at 190 feet. 
19. Well at Tliomastoii, Marengo County. 
! [Well begun May 23, 1905; completed July 7, 1905. Authority, John I. Hawk, contractor and driller. 
Samples preserved. Geologic correlations checked by E. C. Eckel.] 
The surface formation is the Columbia yellow loam (Pleistocene). All the underlying 
formations are of Cretaceous age. They are the Ripley sands, the Selma chalk, and the 
Eutaw sands and sandstones. The record is of interest as showing the total thickness of 
the Selma chalk, or "Rotten limestone." 
Record of well of Southern Cotton Oil Company. 
Columbia: Feet. 
Yellow soil and subsoil and sand; sand water-bearing 0-40 
Ripley : 
Alluvium, sandy and clay with cemented shells and gravel at 45 feet 40- 60 
Brownish limy sand 60-100 
Gray limy sand with sandstone at 119 feet 100-120 
