112 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



lying the Nineveh limestone in central Wood county, but the reds of this 

 interval very soon become unimportant northward, for in Tyler of West 

 Virginia and Washington of Ohio the total in three or four beds is not 

 more than 40 feet, while in Wetzel all are insignificant, that under the 

 Nineveh being only 5 feet; it is thicker in Monroe of Ohio, being 14 to 

 18 feet; but in Pennsylvania and Marshall of West Virginia reds are 

 wanting everywhere in this interval except on the state line in Greene 

 and Marshall, where thin deposits are near the Dunkard coal. Clearly, 

 the reds of the Upper M^ashington-Nineveh interval are confined prac- 

 tically to the central part of the "red area." 



Little can be .said of the column above the Nineveh limestone. Reds 

 in very thin beds were seen just above the Nineveh limestone in Monroe 

 and Wetzel, but this deposit is apparently unknown elsewhere, except 

 in southwest Washington of Pennsylvania, where it is spread through 

 a vertical interval of 50 feet. Much red is in eastern Marshall, in the 

 'space of 180 feet above the Nineveh coal bed, and three beds, 11 feet 

 thick in all, are in the same interval in southern Greene; but no other 

 reds are reported from Greene county, except at one exposure where the 

 Jackson limestone rests on a thick deposit. 



It is evident that the reds of the Dunkard, outside of the "red area," 

 are less important than are those of the Conemaugh, and that they can 

 be compared only with the reds of the Monongahela. Their distribution 

 is extremely irregular and in many cases the deposits seem to be due to 

 local conditions of very limited extent. 



EAST FROM THE ALLEQEENIES 



A few acres of Dunkard rocks remain on Pound knob, the highest 

 point of the Broad Top area in Bedford county of Pennsylvania. There 

 a coal bed, somewhat less than 375 feet above the Pittsburg, underlies 

 100 feet of concealed measures. Conditions west and south suggest that 

 this coal bed is not far from the Washington horizon. Where exposed 

 in 1881 it is 1 foot 4 inches thick, but Professor J. P. Lesley saw an 

 opening in 1856 showing 7 feet of coal and shale. It seems to be almost 

 in contact with a thick underlying limestone.* 



Some isolated patches of Dunkard have been examined in the Georges 

 Creek area of the Potomac basin in Maryland. The extreme thickness 

 is in Allegany county, where about 400 feet remain. The sandstones, 

 except the Waynesburg, are insignificant and the shales are mostly red- 

 dish green. The succession as given in the Maryland reports is : 



* J. J. Stevenson: (T 2), pp. 59, 60, 249. 



