406 The Upper Devon iax Deposits of Maryland 



which are bluish to green ish-gra}- arenaceous shales and massive very com- 

 pact greenish-gray sandstones. Higher are red micaceous sandstones. On 

 the surface of the layers are numerous ripple marks, raindrop impressions 

 and a great variety of mud flows, cracks and, perhaps, the trails of 

 animals. These markings show very clearly the shallowness of the water 

 when the rocks were deposited which are probably in the Catskill 

 formation. A little below the above-mentioned cliff are massive, mica- 

 ceous red sandstones which extend down the river to the vicinity of 

 Crabtree station. Tliese red rocks are of course in the Catskill formation. 



Exposures on the National Road West of Frostburg. — The exposure be- 

 gins on Eed Ridge to the east of Piney Grove probably somewhat east of 

 the road summit, although the exact position is not fixed because the con- 

 tact with the Pocono sandstone is concealed. On the lower part of this 

 ridge to the west of Two Mile Eun are a few thin bands of yellowish-green 

 shale but the rocks are mostly red shales, some of which are quite arena- 

 ceous. The soil and road are decidedly red from the disintegration of these 

 shales, and they are typical exposures of the Catskill formation some- 

 what below its top. The dip is 20° N., G5° W. The hill to the east 

 of Two Mile Run is composed almost entirely of the Catskill red rocks; 

 the soil is red and there are occasional outcrops by the roadside. Not far 

 east of Mr. Thomas Frost's house is a band of greenish-gray sandstone 

 and reddish sandstone above it. The dip is between 24° and 26° N., 55° 

 W. At the eighth mile post west of Frostburg the dip is 27° N., 55° W. 

 and strike is jST., 35° E. The base of the Catskill is toward the crest 

 of the ridge and a dip of 22° N., 60° W. was noted. Small loose blocks 

 of flat pebble conglomerate were picked up at this locality and some of 

 tliem were bi'okoii iurnss smoothly. On the summit of the ridge are 

 greenish shales and sandstones which are in the Jennings although on 

 the eastern side of the ridge, not far west of Mr. Wm. Michel's house, 

 are zones of red shale a number of feet in thickness and the soil is 

 reddish. 



The limits of the Catskill are not sufficiently well defined to make 

 possible any very accurate estimate of its thickness. Its horizontal out- 

 crop, however, was called 1% miles, the direction about 45° from the 



