COJSTENTS. 



lii 



CHAPTER IX. 



UPPER SECONDARY FORMATIONS. 



Supermedial Order. ( Cretaceous, Oolitic, and Sandstone Groups.—" 

 De la Beche.) 



Upper Secondary Rocks : how divided. — Secondary Rocks of 

 England. — New Red Sandstone.— Oolite. — Green Sand. — 

 Chalk.— Flints Page 94 



CHAPTER X. 



TERTIARY STRATA. — (Superior order, Conybeare.) 

 (Supra-cretaceous Group of De la Beche.) 

 Tertiary Strata. — What they include. — Lower Tertiary. — Lon- 

 don Clay. — Middle Tertiary. — M. Deshaye's Classification. — 

 Mr. Lyell's Classification.— -Eocene. — Miocene. — Pliocene. — 

 Crag. — Sections of the Thames Valley. — Thickness of Ter- 

 tiary Beds in England ....... 109 



CHAPTER XL 



BASALTIC AND VOLCANIC ROCKS. 



Volcanic Formations. — Trap Rocks. — Mineral Composition. — 

 Augite Rocks. — Basalt. — Greenstone. — Trachyte. — Clink- 

 stone. — Porphyry. — Amygdaloid. — Lava. — Scoriae. — Pumice. 

 — Tulf. — Conglomerates. — Wacke. — Whinstone. — Pitch- 

 stone. — Volcano of Kirauea. — Trap Dikes. — Fingal's Cave. — 

 Staffa.— Rocks altered by Dikes. — Faults.— How they cause 

 a Dislocation of Strata 114 



CHAPTER XH. 



ALLUVIAL AND DILUVIAL DEPOSITES. 



Alluvial Deposites.— Bowlders.— Diluvial.— Mr. Lyell's Theory. 

 —Post Tertiary.— Modern Deposites : Terrestrial, Lacustrine, 

 Fluviatile 129 



CHAPTER Xni. 



AGENTS WHICH DESTROY ROCKS. 



Proofs of Changes on the Earth's Surface.— Mechanical Agents 

 which destroy Rocks : Rains, Torrents, Rivers, Seas.— The 

 Atmosphere.— Influence of the Sea upon the Land — In Europe 

 —In America . . ..... 132 



