Portage Stages of New York. 213 



district of New York] ; it consists of many veins of gray 

 sandstone, and sometimes of red sandstone .... this rock is 

 found in Otsego, Chenango and Broome counties [New York] ; 

 it covers the whole of the upper part of Susquehannah county, 

 in Pennsylvania, and being there an abundant rock and sur- 

 rounding the town of Montrose, I have thought it well to 

 apply its name to this rock."* This description classed as one 

 formation the Oneonta sandstone, which in that region is over- 

 laid by rocks containing at the base a Portage fauna, higher 

 Chemung species and finally is capped by the Catskill stage, 

 the united mass of these terranes forming Yanuxem's Mon- 

 trose or Oneonta sandstone. In the same year, Professor 

 Mather proposed the " Catskill Mountain series " and de- 

 scribed it as " that [series] which lies between the Helderberg 

 limestone series and the coal-bearing rocks of Carbondale in 

 Pennsylvania."! In his following report Professor Mather 

 subdivides this series into eight groups as follows : 



" 1. Conglomerates and grits. 



f Red and gray grits with red shales mottled with green 

 2. i spots. 



( Montrose sandstone of Professor Yanuxern. 

 8. Chemung group of Professor Yanuxera. 



4. Ithaca " " " " 



5. Sherburne flags " " " 

 6. 



7. Hamilton group " 



8. Marcellus shales " 



u a 



Yanuxern in his final report classed together the " Montrose 

 and Oneonta Sandstone of the Reports " and called them the 

 " Catskill group ;" which he regarded as equivalent to the 

 " Old Red sandstone of England."§ 



In 1841 Conrad published a classification of the rocks of 

 New York. The " formations " were numbered in ascending 

 scale and the following were referred by him to the " Upper 

 Silurian Series " : 



"26. Oneonta group. 



25. Cazenovia " 



24. Tully limestone. 



23. Sherburne group. 



22. Shales near Apulia. 



21. Black slate." || 



*4th Ann. Rep. Third Geol. Dist. N. Y., p. 381. 

 + 4th Ann. Rep. First Geol. Dist. N. Y., p. 227. 

 % 5th Ann. Rep. First Geol. Dist. N. Y., p. 77. 

 § Geol. N. Y., Pt. Ill, 1842. p. 186. 

 f 5th Ann. Rep. Palaeontology N. Y., p. 31. 



