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| Lacustrine Deposits─continued. | |
| Lakes of the Pleiocene and Diluvial Period | 48 |
| Fossil Mammalia of the upper Val d'Arno | 48 |
| Series of Deposits in the upper Val d'Arno | 49 |
| Series of Deposits at Bielbecks | 50 |
| Organic Remains at Bielbecks | 50 |
| Fossil Shells of the Valley of the Thames | 51 |
| Charlesworth's Classification of Mammaliferous Strata | 52 |
| Modern Lacustrine Deposits | 53 |
| Analysis of the Deposition | 55 |
| Subterranean and Submarine Forests | 57 |
| Buried Trees on the Course of a River | 57 |
| Series of Beds associated with Tin Ore at Sandrycock, Cornwall | 60 |
| Turf Moors | 62 |
| Antiquity of Subterranean Forests | 64 |
| General Considerations | 68 |
| CHAP. VII. | |
| UNSTRATIFIED ROCKS IN THE CRUST OF THE EARTH. | |
| General Remarks | 71 |
| Igneous Origin | 71 |
| Geological Age | 72 |
| Composition | 72 |
| Mineral Composition of Unstratified Rocks | 80 |
| Scrope's Synopsis of Volcanic Rocks.─Trachyte | 83 |
| Greystone.─Basalt | 84 |
| Elements of the Old Rocks of Fusion.─Division I. Felspathic | 84 |
| Division II.─Hornblende, Augite, &c Felspathic | 84 |
| Division III. Hornblendic, Augitic, &c. | 85 |
| Mixed Rocks | 86 |
| Gradations among Igneous Rocks | 87 |
| Chemical Composition of the Rocks of Igneous Origin | 90 |
| Analysis of Minerals in Igneous Products | 91 |
| Table of Varieties of Mica | 92 |
| Table of Varieties of Granite | 92 |
| Table of Varieties of Sienite | 93 |
| Table of Combinations of Felspar | 93 |
| Analysis of Serpentine | 94 |
| Table of Felspathic Compounds analogous to Granite | 94 |
| Analyses of Pumice, compact Lava of Calabria, Basalt | 95 |
| Exterior Forms of the Masses of Igneous Rocks | 95 |
| Interposed Beds | 95 |
| Overlying Masses | 97 |
| Fissures | 97 |
| Dykes | 98 |
| Veins | 99 |
