ii 
CONTENTS. 
on the Animal and Vegetable Kingdom.— Height of Mount- 
ains. — Highest Land in Asia — In Europe — In America. — 
Shape of Hills and Mountains .... Page 50 
CHAPTER V. 
ELEMENTARY FACTS AND PRINCIPLES OF GEOLOGY. 
Our Knowledge of the Internal Structure of the Earth very 
limited. — Variety of Minerals and Rocks, arranged in a de- 
terminate Order. — Advantages of Geological Knowledge. — 
Division of Rocks : Stratified, Unstratified, Parallel, In- 
clined, Cropping out, Dip, Thickness, Outliers, Escarpment, 
Faults, Mineral Vems, Rock Dike, Clay Dike, Formations. — 
Illustrations.— How to Observe. — Valleys of Denudation, 
&c 57 
CHAPTER VI. 
CLASSIFICATION OF ROCKS. 
Classification: Primary, Secondary, Transition, Tertiary.— 
Classification of Conybeare and Philips.— Of De la Beche. — 
Primitive Rocks described. — Mr. Lyell's Views. — Hypogene. 
— Division of Primary Rocks : Granite, Syenite, Felspathic 
&c. — Professor Hitchcock's Account of Granite. — Gneiss, — 
Mica Slate. — Hornblende Rock. — Crystalline Limestone. — 
Quartz Rock 67 
CHAPTER VII. 
TRANSITION AND SECONDARY ROCKS. 
Transition Rocks.— How divided. — Slate. — Hornstone. — Whet- 
stones. — Hones. — How Slate is Formed. — Its Cleavage. — 
Transition Limestone. — Gray wacke.— Old Red Sandstone. — 
Claystone 80 
CHAPTER VIIL 
SECONDARY ROCKS. 
Carboniferous Group. 
Division of Secondary Rocks. — Coal Measures. — Vegetation of 
Carboniferous Formation. — Lower Secondary Rocks, how 
divided. — Millstone Grit — Its Mineral Contents.— Carbonif- 
erous Limestone — Its Extent in this Country. — Section of 
Coal Measures in England. — South Gloucestershire Coal- 
basin. — Coal-fields of Derbyshire.— Coalbrook Dale.— Coal 
Measures of North America ,85 
