380 The Upper Devonian Deposits of Maryland 



coarser arenaceous shales, in M'hicli few fossils occur, varying to thin 

 sandstones although there is some of the clear argillaceous shale. The 

 dip is to the east. 



B_y the side of the road on each side of the crest of this ridge, in the 

 piles of stone drawn from the adjacent fields, are numerous blocks of 

 fiat pebble, jasper conglomerate some of which are large, and one meas- 

 uring 14 inches shows that the stratum reached at least that thickness. 

 Mr. Frank C. Graham, who owns the farm on the northern side of the 

 road to the east of the ridge, stated that in his field he had found 

 blocks which required two meu to lift. Still he has never found a solid 

 ledge of the rock in plowing or other work on liis farm, which statement 

 is also made by the farmers on the opposite side of the road as well as 

 by others on whose land loose blocks of the conglomerate were found 

 in northern Garrett County. The blocks are particularly numerous in 

 Mr. Graham's field about opposite the house of Mr. Huey McMan and 

 they also occur abundantly on the western part of Mr. McMan's farm 

 as well as on that of the one to the west owned by James Carey. This 

 ridge, the second one to the west of Mr. Johnson's, is to the west 

 of the fifth mile post from Frostburg. On account of the infrequency 

 of the blocks on the lower part of this ridge and the large number near 

 the summit it appears that the stratum crosses the road at this locality 

 with the general strike of the rocks of this region as is shown by the blocks 

 of the same conglomerate near Mr. Baker's on the road from Johnson's 

 to Salisbury which is to the northeast of the National Eoad blocks. 



The color of the matrix of these conglomerate blocks is very generally 

 a rusty brown in which are imbedded numerous white quartz pebbles of 

 varying size and shape. Many of them, however, are distinctly flat and in 

 the joints of the rock have broken with an even, smooth fracture showing 

 that they were held very firmly in the matrix. This is true regarding the 

 small pebbles as well as those of larger size, so that the jointed face of 

 the rock is perfectly smooth, sometimes covered by a thin film of quartz, 

 and there are no projecting pebbles. This is not true, however, in 

 brealcing the weathered blocks by hand, for in this case there are fre- 

 quently projecting ends of pebbles while many of the fractures instead of 



