PALEOZOIC FORMATIONS OF MARYLAND 



421 



massive, and in Jennings Run about one and one half miles 

 above Corrigansville, a zone of grit and sandstone is thirty-five 

 feet thick. The red rocks increase above this horizon, but 

 Chemung fossils including Spirifer disjiincttis extend some 650 

 feet higher, and the line between the Jennings and Hampshire 



Fig. 2. — Heavy sandstone and conglomerate beds in the upper part of the Jen- 

 nings formation, as shown by the roadside above Corriganville. 



formations has been drawn at the top of this fauna. The forma- 

 tion is between 3800 and 4000 feet in thickness. The upper 

 part of the Jennings may be correlated with the Chemung of 

 New York or No. Vlll^of Pennsylvania. 



Hampsliire formatio?i. — This formation crosses the extreme 

 eastern part of the county from the northeast to the southwest ; 

 the next area, which is the largest, flanks each side of Town Hill 

 and crosses the county in the same general direction ; while the 

 third extends along the middle part of the eastern face of 

 Alleghany Front. The rocks consist mainly of an alternation 

 of red, flaggy, and massive sandstones and arenaceous or 



