IV 
CONTENTS. 
Page. 
Springs, temperature, 80 
Rainfall, 81 
Snow, 84 
Frosts, 84 
Humidity , 85 
Atmospheric Pressure, 88 
Clouds, 88 
Winds, 93 
Summary , 99 * 
Sanitary, 100 
Botanical, 100 
Agricultural, , . . 104 
Zoological, 105 
CHAPTER III. 
GENERAL PRINCIPLES, 107 
Geological Chart, 110 
Igneous Rocks, 113 
Laurentian System, 113 
Huronian System, 113 
Silurian System, 114 
Devonian Ststem, 115 
Carbo ' iferous System, 11 5 
Permian System, 110 
Triassic System, 110 
Jurassic System, Hr 
Cretaceous System, 117 
Tertiary System, 117 
Quaternary System, US 
CHAPTER IV. 
OUTLINES OF THE GEOLOGY OF NORTH CAROLINA : 
Laurentian, 121 
Hurorian, . 131 
Silurian, 139 
Triassic, 141 
Cretaceous, 147 
Tertiary, 149 
Quaternary, 153 
CHAPTER V. 
ECONOMICAL GEOLOGY : 
Section I. Soils, 162 
Swamp Soils of Eastern N. C., 168 
Soils of the Middle Region, 1§3 
Soils of the Piedm ont and Mountain Sect ion s, 185 
Section II. Fertilizers, 187 
Marls, 187 
Greensand Marl, 188 
