Maryland Geological Survey 171 



a thousand feet high and the Helderberg and Tonoloway formations are 

 well exposed. The escarpment is most easily reached from Riverside Sta- 

 tion on the West Virginia Central Railroad. 



Tonoloway Formation 



High up the hill, which is largely covered at this place, 

 although well exposed a little farther south, is a cliff of thin- 

 bedded limestones from 75 to 100 feet high. This escarpment 

 is very conspicuous and about one-half or three-quarters of the 

 distance to the top of the mountain. Along the top of the 

 escarpment the Tonoloway formation is found. Several speci- 

 mens of Tentaculites gyracanthus, Leperditia alta, Beyrichias, 

 Pelecypoda, small Meristella and Rhynchospira of the Tonolo- 

 way formation of this region were obtained. 



For some distance back from the top of this cliff the ground 

 is level. 



Helderberg Formation 



Near the bottom of the next ascent is a ledge 5 feet thick of 

 the compact massive gray nodular limestone of the Keyser 

 member. 



At the top of the rise and crowning the brow of the hill with a 

 cliff from 30 to 40 feet high is the compact gray limestone of the 

 New Scotland member with numerous layers of white chert, 

 dipping quite perceptibly to the southeast. 



On the very top of the cliff Spirifcr macropleurus is common 

 occurring chiefly in the white chert. 



Oriskany Formation 



The Oriskany is shown some distance to the eastward farther 

 down the slope. This escarpment forms the highest part of 

 the mountain. 



The fossils obtained in the New Scotland limestone are : Spirifer macro- 

 pleurus (a), S. perlamcUosus (r), Uncinulus velUcatus (rr), Lcptcvna 

 rhomhoidalis (c), awd Ehipidomellaohlaia (rr). 



V. Section at Cedar Cliff 

 The cliffs in Knobly ]\rountain at Cedar Cliff are almost as imposing as 

 those at Riverside. The tracks of the Western Maryland Railroad run 

 along the base of this expo-surc. The section is as follows according to the 

 measurement of R. B. Rowe. 



