THE OIL- AND GAS-PRODUCING ROCKS OF OHIO 825 



WELL NO. I, HAINES FARM, ROSEVILLE, SANDUSKY COUNTY 

 Drive pipe ... 30 f ee t 



f Gray lime - - - - 140 



I White lime - - - - 160 



Niagara series, J Blue lime " 2 ° 



White slate, first hreak - - 2 



Brown lime, hard - - - 21 



(_ Light slate, second break - - 20 



Clinton limestone - - - - - - 100 



Medina shales (red) ------ 80 



Hudson River series (white shales) - - 427 



Utica shale (brown) - - ... 252^ 



Trenton limestone at - 1,252^ 



For comparison a record is given of a well drilled on the Rohr 

 farm near Groveport, Franklin county, in the central part of the 

 state : 



Drift - - - - - - - - 136 feet 



Ohio shales - ----- 167 



Cornifereus limestone, top at ■ - - - - 303 



Niagara limestone, bottom at 980 



Clinton shales - - - - - - 110 



Clinton sand, shells only at - - - 1,110 



Trenton limestone at - - - - 2,146 



Bottom of well (in Trenton) - - 2,675 



THE SILURIAN. 



The rocks of this age in Ohio are divided by Orton as fol- 

 lows: 1 



4. Lower Helderberg limestone - - 50-600 feet 



3. Niagara limestone and shale - 125-380 



2. Clinton group - 20-150 



1. Medina shale .... 25-150 



Tke Clinton. — Of these divisions the second and fourth only 

 call for recognition in this article. Along its line of outcrop in 

 southwestern Ohio the Clinton consists essentially of a highly 

 crystalline limestone, rich in fossils, especially crinoid stems. 

 Commonly it has a light color, the tint of which varies from place 

 to place. The rock takes a good polish, and is sometimes called 

 marble. Occasionally the formation contains lean hematite, and 



*Ibid., Vol. VII, pp. 4, 5. 



