84 NEW YORK STATE MUSEUM 



1897 Prosser, Charles S. & Eowe, Richard B. published Sections 



of the Stratigraphic Geology of the Eastern Helderbergs 

 (N. Y. State Geol. 17th An. Rep't) giving sections and 

 lists of fossils at Clarksville, Oniskethau creek, New Salem 

 and Gountryman hill. Some of these are republished in 

 chapter 6. 



1898 Prosser, Charles S. published Sections of the Formation 



along the northern end of the Helderberg Plateau (N. Y. 

 State Geol. 18th An. Rep't). In this detailed sections of 

 the Helderberg and other strata of the Schoharie region 

 are given ; also characteristic sections of Altamont, Indian 

 Ladder, Knoxville and other typical regions in the Helder- 

 bergs. Most of these are republished in chapter 6. 



1900 Stevenson, J. J. published a Section at Schoharie (Geol. Soc. 



Am. Bui. 2:67), comparing it with sections in southern 

 Pennsjivania and Virginia. 



1901 Clarke, John M. discussed the Goniatite limestone and asso- 



ciated Marcellus shales in Schoharie county, and gives 

 list of fossils and localities of the Goniatite stratum (N. Y. 

 State Mus. Bui. 19. 1901. p. 123-25) . 



1901 Clarke, John M. mentions the occurrence of A m n i g e n i a 

 c a t s k i 1 1 e n s i s in the red sandstones (Catskill) on 

 the road from Jefferson to Gilboa and at the base of the 

 hills south of Jefferson, Schoharie co. N. Y. He further 

 discusses the " Value of Amnigenia as an Indicator of 

 Fresh-water Deposits during the Devonic of New York, 

 Ireland and the Rhineland. (Ibid. p. 199-203) 



1901 Ries, Heinrich in an '^Account of the Lime and Cement 

 Industries of New York " discussed the section at Howes 

 Cave and the production of cement [N. Y. State Mus. 

 Bui. 44]. 



1901 Eckel, Edwin C. in " Chapters on the Cement Industry in 

 New York " gives an account of the cement industry of 

 the Helderberg Cement Co. at Howes Cave [Ibid. p. 869- 

 70]. 



