TABLE OF CONTENTS, 
LIST OF ILLUSTRATIONS. 
DESCRIPTION OF THE MAP. 
PLAN OF ARRANGEMENT IN THE STATE COLLECTION. 
CHAPTER I. 
Page 
Preliminary considerations.. 1 
CHAPTER II. 
General features of the strata, topography, etc. of the Fourth Geological District.. 12 
CHAPTER III. 
Tabular view of the rocks and groups described in the Geological Reports of New-York; their 
extent and agreement with the formations of Europe.... IT 
CHAPTER IV. 
Enumeration of the rocks and groups (in the New-York system) below those of the Fourth 
Geological District, in their order of succession. 26 
1. Potsdam sandstone..... 27 
2. Calciferous sandrock. 28 
3. Black river limestone group. 28 
4. Trenton limestone... 29 
5. Utica slate.... ...... 29 
6. Hudson river group.... 30 
7 and 8. Oneida conglomerate and grey sandstone. 31 
3* 
