Maryland Geological Survey 405 



various railroad nuts show excellently the irregular nature oX the bedding 

 in these rocks^ for the sandstones often appear as lenses which replace for 

 a distance of several rods a thickness of from 10 to 20 feet of red shales. 

 On the othei- side the shales will then reappear, and the sandstones are, 

 apparently, evidence of strong currents which eroded, channels in the 

 soft shales that were later filled by sands. If this interpretation be 

 correct these sandstone lenses are fine examples of channel filling. The 

 rocks in some of the cuts are mainly sandstone with a thickness of 25 

 feet; but as a nile there is a greater amount of red shale which is often 

 banded by olive colored zones. Some of the sandstones are of a greenish- 

 gray color. These rocks are in the upper portion of the Catskill formation. 



Two miles above Frankville in the bed of Crabtree Creek which is 

 about 115 feet lower than the railroad track, are red sandstones. On the 

 path up the bank is, apparently, a great deal of red argillaceous shale 

 while in the railroad cut opposite this locality the sandstone is mostly 

 greenish-gray in color and in it is a calcareous stratum or breccia. 



Spring Lick Creek enters Crabtree Creek from the north and near the 

 top of the hill on the road up Spring Lick is a ledge of faintly reddish 

 sandstone. This stratum is about 740 feet above Crabtree Creek and 

 31/0 miles from Frankville. The road from Crabtree Creek follows 

 Spring Lick Tiun to the top of the mountain about 41/0 miles from 

 Frankville. On the lower part of the mountain are red shales and sand- 

 stones with some beds of coarse gray sandstone, all belonging in the 

 Catskill formation ; but about two-thirds of the distance from the 

 bottom are coarse bluish-gray sandstones containing an occasional speci- 

 men of Grammysta. Higher, an occasional poorly preserved Spirifer was 

 found; and well towards the top of the mountain in much decomposed 

 buff colored argillaceous sandstones are fine specimens of Spirifer dis- 

 junctus SoAverby, Produdella, Camarotoecliia. Sclnicherfclln, and pele- 

 cypods. Olive shales occur along the roadside on the summit of the 

 mountain and no fossils were found. The top of the mountain is 880 

 feet above Crabtree Creek and the rocks belong in the Jennings formation. 



On the eastern bank of Savage Eiver some distance below Bear Pen 

 Run and opposite a school-house is a conspicuous cliff in the lower part of 



