452 The Upper Devonian Deposits of Maryland 



The Naples, Ithaca, Tarkhead, and Chemung faunas are all well 

 developed. Their characteristics will be considered later. 



II. Section Along Yellow Springs Run'' 

 An excellent section of the lower part of the Jennings is exposed on the 

 road leading from Berkeley Springs to New Hope, West Virginia, along 

 Yellow Springs Run, 3 miles east of Berkeley Springs. It begins 1793 

 feet east of the point where the road crosses the north fork of the Eun 

 and extends westward 2392 feet. 



til 



Jennings Formation g^ 



cs o '^ *^ m dj ^ 



Chemung Sandstone Member 9"^ c S = "sf-- 

 Road N. 75° W. sgS.o-g 3 J^S 

 Concealed. A fine-grained conglomeratic sandstone oc- 

 curs at the top of this interval 2393 162 2147 



Parkhead Sandstone Member 



Road S. 58° W. 



Concealed. At the top of this unit massive brown conglom- 

 eratic sandstone is exposed, at the first turn west of the 

 bridge. Fragments of the conglomerate are seen in the 

 field north of the road 2193 190 1985 



Road N. 65° W. 



Center of bridge over north fork of Yellow Springs Run. 1793 

 Concealed in part. A massive brown sandstone 20 feet 

 thick occurs 1742 to 1762 feet vertically. N. 23° E. 55° W. 1793 



Smooth green shale. N. 23° E. 55° W 1698 



Green shale breaking into irregular fragments. A brown 

 conglomeratic sandstone 15 inches thick at base of unit.. I6681 



Smooth green shale. N. 25° E. 40° W 1653 



Arenaceous shale breaking irregularly 1593 



Green shale breaking irregularly 1586 



Green shale breaking irregularly. Thin beds of fine- 

 grained sandstone at top. At the bottom of this unit oc- 

 curs a conglomeratic sandstone containing Camarotoechia 

 congregata var. parkhcadensis abundant, and Spirifer (Del- 

 thyris) mesacostalis abundant 1561 21.5 1621 



^ Measured by pacing. 



77.8 



1795 



24.5 



1717 



12.2 



1693 



38.5 



1680 



4.5 



1642 



16 



1637 



