GEOLOGY AND PALEONTOLOGY OF THE SCHOHARIE VALLEY Sll 



Cephalopoda of the Upper Helderberg, Hamilton, Portage 

 and Chemung groups ", covering those of the Schoharie 

 region. 



1880 Guypt, Arnold, published a paper on the Physical Structure 

 and Hypsometry of the Catskill Mountain Region, in 

 which he discussed the physiography of the Schoharie 

 valley [quoted above]. (Am. Jour. Sci., ser. 3. 19:442- 

 443) 



1884 Hall, James, published Palaeontology of New York, v. 5, pt 1, 

 Lamellibranchiata I (Monomyaria) of the Upper Helder- 

 berg, Hamilton and Chemung groups, including those of 

 the Schoharie region. 



188'5 Hall, James, published Palaeontology of New York, v. 5, pt 1, 

 Lamellibranchiata II (Dimyaria) of the Upper Helder- 

 berg, Hamilton, Portage and Chemung groups, covering 

 those of the Schoharie region. 



1887 Hall, Jameis and Simpson, George B. published Palaeon- 



tology of New York, v. 6, Corals and Bryozoa of the Lower 

 Helderberg, Upper Helderberg and Hamilton, including 

 those of the Schoharie region. 



1888 Hall, James & Clarke, John M. published Palaeontology of 



New York, v. 7, Trilobites and other Crustacea of the 

 Oriskany, Upper Helderberg, Hamilton, Portage, Chemung 

 and Catskill groups, containing those of the Schoharie 

 region. 



1893 Darton, N. H. published a report on the Relations of the 

 Helderberg Limestones and Associated Formations in 

 Eastern New York (N. Y. State Geol. 13th An. Rep't, v. 1) 

 which deals largely with the Schoharie region. 



1897 Prosser, Charles S. published Classification and Distribu- 

 tion of the Hamilton and Chemung series of Central and 

 Eastern New York, pt 2 (N. Y. State Geol. 17th An. Rep't) . 

 This is replete Avith sections of the higher strata in the 

 Schoharie region, some of which are reproduced in chap- 

 ter 5. 



