CONTENTS. IX 



Fluvial Hypothesis, 154 



Epoch of the last Deluge, - 165 



Diluvial agency in other parts of the world, 166 



Mounds in the Western States, - - 168 



Stratification of Diluvium, - 169 



Minerals and Organic Remains in Diluvium, - - 171 



TERTIARY FORMATIONS denned, 172 



The Most Recent Tertiary, - 173 



Remarkable Disturbances in its Strata, - 174 



Position and Thickness of its Strata, - - 175 



Mineral Contents, 178 



Organic Remains, - - 182 



Theoretical Considerations, - 183 



Plastic Clay ; Its Mineralogical Characters, - - 184 



Mineral Contents, 188 



Organic Remains, - '** *- 191 



Dip, Direction and Superposition of the Strata, 196 



Plastic Clay in Truro and Duxbury, - 199 



Theoretical Considerations, - ' 202 

 Supposed Volcanic Agency at Gay Head ; Geological Specula^ 



tions of the Aborigines, - 203 

 RAW RED SANDSTONE : Proofs of its existence in the Connecticut 



Valley, 206 



Mineralogical Characters of this Rock, - 209 



Topography of this Formation, 216 



Dip, Direction and Thickness of the Strata, - - 219 



Mineral Contents, . 225 



Organic Remains, - - 232 



Theoretical Considerations, 241 

 GRAYWACKE: Whether identical with that in Europe, - - 248 



Mineralogical Characters, - 251 



Topography of Graywacke, - 268 



Dip, Direction and Thickness of the Strata, -.''. - 271 



Mineral Contents : Anthracite, 275 



Organic Remains, - 284 



Theoretical Considerations, - 285 

 ARGILLACEOUS SLATE : Its definition and classification, - - 286 



Mineralogical Characters, 287 



Its Topography - 288 



Dip, Direction and Thickness of the Strata, 289 



Mineral Contents : Disturbances in its Strata, - 291 



Theoretical Considerations. - 294 



LIMESTONE : Encrinal Limestone of Bernardston, - 295 

 Berkshire Limestone : Discussion concerning its position and age, 297 



Blanford Limestone : Micaceous Limestone, 305 

 Limestone in Whitingham, Vt. in Bolton, Boxborough, Littleton, 



Acton, Carlisle, and Chelmsford, 308 



Limestone in Smithfield, R. I. 311 

 B 



