384 The Upper Devonian Deposits of Maryland 



the southern part of Pea Ridge there are fine views of the narrow valleys, 

 steep slopes and peaks to the southward. 



To the north-northwest of Pea Ridge and Avilton is Walnut Hill which 

 is on the western side of the Devonian anticlinal axis and is composed 

 of the Catskill fonnation. On the road crossing Walnut Hill from 

 Avilton to Piney Grove the top of the Catskill formation is near the 

 top of Red Ridge and its base is 1 mile northwest of Avilton near McKen- 

 zie's store. On the ridge just east of the store are loose blocks of con- 

 glomerate in the road in one piece of which a fragment of a fossil was 

 noticed. The rocks in place are brownish-red, rather arenaceous shales 

 near the dividing line of the Catskill and Jennings formations. Tlie 

 blocks of conglomerate resemble, lithologically, the one which has been 

 noticed in several localities very near the top of the Jennings formation, 

 and the yellow soil of the Jennings covers the hill to the eastward. On 

 the road to the southeast are occasional slight exposures of greenish shales 

 and sandstones of the Jennings formation. 



On top of the hill just northwest of Avilton are numerous loose blocks 

 of the flat pebble, jasper conglomerate. The field to the south of the 

 road is well covered with numerous blocks of it and also a brownish sand- 

 stone which weathers to a very light gray color. The pebbles of this 

 conglomerate on the faces of the blocks are broken evenly so that there 

 is a smooth fracture and the rock in its lithologic appearance closely 

 resembles the conglomerates described on the National Road near Mo- 

 Man's and Graham's and on the Salisbury Road at Bakei-'s. On account 

 of the conspicuous presence of these blocks in the immediate vicinity of 

 Avilton the name Avilton conglomerate is proposed for this zone of flat, 

 jasper pebble conglomerate in the Upper Jennings of northern Garrett 

 County. The conglomerate described to the northeast on the National 

 Road near McMan's and Graham's and on the Salisbury Road at Baker's 

 is undoubtedly identical. The white quartz, flat pebble conglomerate 

 described to the south of Avilton on Pea Ridge and the numerous blocks 

 of a similar one found in the Mountain Lake Park-Oakland region and to 

 the south of those towns is correlated provisionally with the Avilton 

 conglomerate. 



