CONTENTS. 



IX 



Fluvial Hypothesis, - 164 



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 defined, ----- 572 



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 



