44 NEW YORK STATE MUSEUM 



quadrangle comes to an end before Deck is reached, since here the 

 Camillus rests upon the upper gray Clinton sandstone. 



The Camillus crosses the quadrangle as a well-defined formation 

 and grades into the Bertie waterlime. 



The Cobleskill is present and here lithologically much like the 

 Bertie. The presence, however, of characteristic fossils clearly 

 defines its position between the Bertie and Rondout waterlimes. 

 The Rondout as a rule is not well or frequently exposed, due to its 

 position at the base of the often steep-faced Manlius where there is 

 always considerable talus material. 



Of the Lower Devonian formations, the Coeymans and Onondaga 

 limestones are present in great force and for the most part are sepa- 

 rated by only a few feet of Esopus grit. Only at one place was an 

 outcrop of the Oriskany observed, and here but a few inches thick. 

 No outcrops of the New Scotland beds were observed but they 

 undoubtedly extend into the quadrangle from the east, since a 

 well-defined exposure is seen one-half of a mile east of the limits of 

 the map. It is well established that neither the Becraft limestone 

 nor the Schoharie grit extend as far west as this quadrangle. 



Above the Onondaga limestone the Marcellus black shale is well 

 developed and about 25 feet from the base is found the Cherry 

 Valley limestone, named from Cherry Valley which is located along 

 the east boundary of the quadrangle. 



Above the Marcellus black shale the transitional beds marking 

 the gradual change from the Marcellus into the Hamilton beds, are 

 included under the Cardiff shale. The overlying Hamilton beds, 

 which are here undivided stratigraphically, are the youngest rocks 

 within the district and form the high range of hills of the southern 

 part of the quadrangle. 



Of particular interest is the glacial geology of this quadrangle, for 

 here centers an area of drumlins second only in importance in this 

 State to the drumlin region of western, New York. The outstanding 

 feature of the drumlins is their direction, which is here east and west, 

 while the western New York drumlins have a north and south 

 direction. 



GLACIAL GEOLOGY 



Professor Fairchild spent the season in a general summary of his 

 important study of postglacial continental uplift of northeastern 

 America, the data for which are largely based on his long-continued 

 studies in New York. In going farther afield for the application of 

 his conclusions and accumulation of additional data, an extensive 



