Maryland Geological Survey 419 



beds, the upper conglomerate, and the upper shale and sandstone beds 

 respectively. The upper beds are in turn subdivided into three parts. 

 The following- table indicates the sequence and faunal zones west of Side- 

 ling Hill. 



Chemung member. 



Upper shalo and sandstone beds. Camarotoechia eximia zone. 



Beds of Jennings type. Palseanatina angusta zone. 



Red beds of Catskill type. 



Beds of Jennings type. 

 Upper conglomeratic sandstone beds. 

 Middle shale and sandstone beds. 



Lower conglomeratic sandstone beds. Tropidoleptus carinatus zone. 

 Lower shale and sandstone beds. Dalmanella tioga zone west of Wills 

 Mountain. 



A tliii'd persistent conglomerate occurs between the lower and upper 

 conglomerates in the sections west of Wills ^lountain, whose relation to 

 the conglomerates of the eastern section is not apparent. The character- 

 istics of these divisions will now be brietiy considered. 



Lower shale and sandstone beds, Dalmanella tioga zone west of Wills 

 Mountain. These beds consist of shale and interbedded massive sand- 

 stones. In the syncline west of Warrior Mountain many of the strata are 

 very red, suggesting the red bed that occurs in a similar position in the 

 section on Williams Road, Polish Mountain. East of Wills Mountain, 

 the beds of this division contain a number of species that pass up into 

 them from tbe Parkhead member, among which gastropods are very 

 prominent. (See tahle of distribution.) West of Wills ^Mountain the 

 lower beds are characterized by a profuse development of Dalmanella 

 tioga, which species has not as yet been observed in Maryland either at 

 higher horizons or east of Wills Mountain. 



Lower Conglomeratic Sandstone Beds. — Tropidoleptus carinatus Zone. 

 A massive conglomeratic sandstone appears in most of the sections east 

 of Wills Mountain about 600 feet above the base of the Chemung member, 

 which probably represents one horizon. This is shown by the fact that 

 it contains a recurrence of the Tropidoleptus carinatus fauna and also by 

 its nearly constant altitude (600 feet) above the base of the Chemung. 

 The conglomerate contains flat pebbles often of a large size, some of 



