《the ancient volcanoes of great British VOL.II》

CHAPTER ⅩⅩⅨ THE CARBONIFEROUS VOLCANOES OF ENGLAND1

The North of England : Dykes, Great Whin Sill—The Derbyshire Toadstones—The Isle of Man—East Somerset—Devonshire1

CHAPTER ⅩⅩⅩTHE CARBONIFEROUS VOLCANOES OF IRELAND37

King's County—The Limerick Basin—The Volcanic Breccias of Doubtful Age in County Cork37

BOOK Ⅶ THE PERMIAN VOLCANOES53

CHAPTER ⅩⅩⅩⅠ THE PERMIAN VOLCANOES OF SCOTLAND 53

Geographical Changes at the Close of the Carboniferous Period—Land and Inland-Seas of Permian time—General Characteristics and Nature of the Materials erupted—Structure of the several Volcanic Districts : 1. Ayrshire, Nithsdale, Annandale ;2. Basin of the Firth of Forth53

CHAPTER ⅩⅩⅩⅡ PERMIAN VOLCANOES OF ENGLAND94

The Devonshire Centre—Eruptive Rocks of the Midland Coal-fields94

BOOK Ⅷ THE VOLCANOES OF TERTIARY TIME107

CHAPTER ⅩⅩⅩⅢ 107

Vast lapse of time between the close of the Pal?ozoic and beginning of the Tertiary Volcanic Eruptions — Prolonged Volcanic Quiescence — Progress of Investigation among the Tertiary Volcanic Series of Britain107

CHAPTER ⅩⅩⅩⅣ THE SYSTEM OF DYKES IN THE TERTIARY VOLCANIC SERIES118

Geographical Distribution—Two Types of Protrusion—Nature of component Rocks—Hade — Breadth — Interruptions of Lateral Continuity — Length — Persistence of Mineral Characters118

CHAPTER ⅩⅩⅩⅤ THE SYSTEM OF DYKES—continued 145

Direction—Termination upward—Known vertical extension—Evidence as to the move-ment of the Molten Rock in the Fissures—Branches and Veins—Connection of Dykes with Intrusive Sheets—Intersection of Dykes—Dykes of more than one infilling —Contact metamorphism of the Dykes—Relation of the Dykes to the Geological Structure of the Districts which they traverse—Data for estimating the Geological Age of the Dykes—Origin and History of the Dykes145

CHAPTER ⅩⅩⅩⅥ THE PLATEAUX181

Nature and Arrangement of the Rocks : 1. LAVAS. —Basalts, Dolerites, Andesites—Struc-ture of the Lavas in the Field — 2. FRAGMENTAL ROCKS. - Agglomerates, Con- glomerates, and Breccias—Tuffs and their accompaniments181

CHAPTER ⅩⅩⅩⅦTHE SEVERAL BASALT-PLATEAUX AND THEIR GEOLOGICAL HISTORY-ANTRIM, MULL, MORVEN AND ARDNAMURCHAN199

CHAPTER ⅩⅩⅩⅧTHE BASALT-PLATEAU OF THE PARISH OF SMALL ISLES-RIVERS OF THE VOL- CANIC PERIOD215

CHAPTER ⅩⅩⅩⅨTHE BASALT-PLATEAUX OF SKYE AND OF THE FAROE ISLES249

CHAPTER ⅩL THE MODERN VOLCANOES OF ICELAND AS ILLUSTRATIVE OF THE TERTIARY VOL- CANIC HISTORY OF NORTH-WESTERN EUROPE260

CHAPTER ⅩLⅠ THE ERUPTIVE VENTS OF THE BASALT-PLATEAUX270

Vents filled with Basalt or other Lava-form Rock—Vents filled with Agglomerate270

CHAPTER ⅩLⅡ THE BASIC SILLS OF THE BASALT-PLATEAUX298

CHAPTER ⅩLⅢ THE BOSSES AND SHEETS OF GABBRO327

Petrography of the Rocks—Relations of the Gabbros to the other members of the Volcanic series—Description of the Gabbro districts—Skye327

CHAPTER ⅩLⅣ THE BOSSES AND SHEETS OF GABBRO IN THE DISTRICTS OF RUM, ARDNAMURCHAN, MULL, ST. KILDA AND NORTH-EAST IRELAND. HISTORY OF THE GABBRO INTRUSIONS349

CHAPTER ⅩLⅤ THE ACID ROCKS364

Their Petrography—Their Stratigraphical Position and its Analogies in Central France364

CHAPTER ⅩLⅥ TYPES OF STRUCTURE IN THE ACID ROCKS-BOSSES378

CHAPTER ⅩLⅦ THE ACID BOSSES OF MULL, SMALL ISLES, ST. KILDA, ARRAN, AND THE NORTH- EAST OF IRELAND395

CHAPTER ⅩLⅧ THE ACID SILLS, DYKES AND VEINS430

CHAPTER ⅩLⅨ THE SUBSIDENCES AND DISLOCATIONS OF THE PLATEAUX447

CHAPTER L EFFECTS OF DENUDATION455

CHAPTER LⅠ SUMMARY AND GENERAL DEDUCTIONS466