XIV 
CONTENTS. 
CHAPTER VI. 
OLD RED SANDSTONE. 
Relative position, extent, etc. 278 
Localities. 280 
Organic remains. 280 
CHAPTER VII. 
CARBONIFEROUS SYSTEM. 
Conglomerate or equivalent of the millstone grit of England. 284 
Diagonal lamination. 286 
Concretions. 287 
Localities.‘.. 289 
Thickness. 291 
Organic remains... 291 
CHAPTER VIII. 
Uplifts, dislocations and undulations of the strata in the Fourth District. 295 
CHAPTER IX. 
Jointed structure of the rocks of the Fourth District. 299 
Jointed structure of the limestones. 302 
Jointed structure of the shales and sandstones. 303 
Jointed structure of conglomerate. 307 
CHAPTER X. 
Mineral and gas springs, rising from the rocks of the New-York System in the Fourth District, 308 
1. Nitrogen springs. 308 
2. Springs evolving carburetted hydrogen and petroleum (Burning springs),. 309 
8. Sulphuretted hydrogen springs. 311 
4. Salines or brine springs. 314 
Tabular list of the Mineral Springs in the Fourth District, with their Geological position 
and products. 315 
CHAPTER XI. 
New Red sandstone and Tertiary 
317 
