66 J. J. STEVENSON — LOWER CARBONIFEROUS, APPALACHIAN BASIN 



resting on the mass of Logan shale. The 118 feet at the bottom may be 

 taken to represent the silicious limestone ; the black shale, the " Pencil " 

 of wells farther east. In that case number 2 would represent the upper 

 limestone and number 1 would be either the upper shales or continuous 

 with the u})i)er portion of the limestone. That these are the proper 

 assignments appears very probable from the record of a Avell 25 miles 

 southwest from Ravenswood, in Mason county, opposite Gallipolis, Ohio ; 

 for there the driller reports shale 45 feet, limestone 165 feet, separated 

 from the hard Logan below by 10 feet of shale. The limestone is not 

 differentiated in the record. Gallipolis is less than 30 miles east from 

 Maxville exposures in Ohio. At Letart, in northern Mason, on the 

 Ohio, and 12 miles west from Ravenswood, the condition is sufficiently 

 clear, for there one finds 



Feet 



1. Limestone 60 



2. Hard sand and j^^ray shale 4 



3. Limestone 10 



4. Gray sand and limestone 24 



Number 1 is the Maxville limestone as exposed in central Ohio, and 

 numbers 3 and 4 are the silicious limestone, which is becoming thinner 

 in this direction, to disappear before the Maxville outcrop has been 

 reached. It will be remembered that Andrews discovered this portion 

 of the limestone in Kentucky.* 



Kanawha county lies south from Roane. At the Burning spring, 40 

 miles south from Spencer, blue limestone, 300 feet thick, underlies the 

 Pottsville and rests on shales of apparently great thickness. The lower 

 portion of the limestone is more or less silicious, but the driller did not 

 diff"erentiate the portions, so that their respective thicknesses can not be 

 given. This locality is about 50 miles south-southwest from Sutton, in 

 Braxton county, and probably 10 miles westward off" the line of strike 

 from that place. The limestone is considerably less than at Sutton, but 

 detrital beds appear to form a very small part of the mass. At Central 

 City, in Cabell count}^ 50 miles west from the Burning spring and 30 

 miles south from Gallipolis, the limestone is 150 feet, with 28 feet of 

 shale between it and the Logan below. Andrews's section, in Greenup 

 county, Kentucky, is less than 30 miles west from Central City. 



Lincoln county is southeast from Cabell and southwest from Kanawha. 

 In its southern portion, on the border of Mingo county, a record gives 

 235 feet of limestone divided at 75 feet from the bottom by 2 feet of 

 sandstone. This is 35 miles south-southwest from the Burning spring 



*The references for this tier of counties are Geol. of West Virginia, vol. i, pp. 255, 258, 260, 2t)2, 

 20-1, 268, 270, 274, 282, 284, 



