vi 
CONTENTS. 
Anthracite Coal Measures— Prof. Roger's Account of them. — 
The Shales.— Section of Coal Measures of Pennsylvania. — 
Section of Carboniferous System of Ohio.— Coal Measures 
on Kenawka River— At "Wheeling, Va.— At Pittsburgh— At 
Kiskiminitas. — Millstone Grit and Shale. — May we expect to 
find Coal in New-York ? Page 237 
CHAPTER XXIII. 
GEOLOGY OF THE UNITED STATES. 
UPPER SECONDARY FORMATIONS. 
C 
(Supermedial Order. Cretaceous ^ Oolitic, and Sandstone Groups, 
— De la Beche. Saliferous System.) 
Upper Secondary.— Division. — How distinguished from Terti- 
ary. — New Red Sandstone. — What it includes. — Its Range 
and Extent.— OoHte.— Green Sand. — Equivalent to Cretace- 
ous Group. — Its Fossils. — Its Range and Extent. — Mode of 
its Formation. — General Results 257 
CHAPTER XXIV. 
TERTIARY FORMATION. 
Superior Order (Conybeare). Supracretaceous Group (De la 
Beche). 
Tertiary.— How distinguished from other Formations? — Mr. 
Lyell's Division. — Pliocene, &c. — Its Range and Distribution, 
— Professor Hitchcock's Arrangement. — Plastic Clay. — Ter- 
tiary in the State of New- York.— Ancient Arm of the Sea.— 
How Drained. — Newer Pliocene of the United States. — Older 
Pliocene and Miocene Formations of the United States. — 
Eocene do 265 
CHAPTER XXV. 
GEOLOGY OF THE UNITED STATES. 
BASALTIC AND VOLCANIC ROCKS. 
Basaltic and Volcanic Rocks. — Evidences of Volcanic Action 
in the Rocky Mountains. — Trap Rocks.— Bakewell's Defini- 
tion of Basalt — Of Greenstone. — Localities of Greenstone 
Trap— In Massachusetts — New- Jersey— Columbia River- 
Nova Scotia 27i 
