CONTENTS. 
7 
Page. 
24. Genesee slate, Black shale of the Report, .> .. 168 
25. Portage or Nunda group, Sherburne flags and shale of the Reports,. 168 
Preliminary observations upon the upper part of the Erie division of the New-York System,. 170 
26. Ithaca group, ...-... 174 
27. Chemung group,. 179 
28. Catskill group, Montrose and Oneonta sandstone of the Reports, Old redsandstone of 
England,.. 186 
CHAPTER VI. 
Localities of the superposition of the different rocks of the preceding chapters, with the exception 
of some of the upper ones, illustrated by wood-cuts,. 195 
CHAPTER VIE 
Uplifts in the valley of the Mohawk, and upon East and West Canada creeks,. 203 
CHAPTER VIII. 
Quaternary deposits,. 212 
Alluvial deposits of clay, etc. 212 
— of sand,. 220 
— of boulders,. 220 
— of boulders of Primary rock,. 321 
— of boulders or blocks of the Transition class,. 223 
— of lake marl,. p .224 
Localities of calcareous or lake marl from the rocks,. 225 
The same, but from deposits of alluvial materials,... 225 
Calcareous tufa,. 226 
Ferruginous tufa,. 227 
Bog ore or limonite, etc. 228 
Peat or muck,. 229 
Soil,. 231 
Mineral spring,.„. 233 
CHAPTER IX. 
Embracing excavations or denudations, valleys; lakes; scratches upon rocks which have been 
smoothed; and mounds,. 235 
Excavations, valleys,. 235 
Lakes,. 237 
Otsego lake,. 238 
Schuyler’s lake,.,. 238 
Cazenovia lake,... 238 
Otisco lake,. 238 
Skaneateles lake,. 238 
Owasco lake,... 239 
