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. 



(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.— Oolite.— Green Sand. — Equivalent to Cretace- 

 ous Group.— Its Fossils. — Its Range and Extent. — Mode ot 

 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 C!ay. — 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. — Bake well's Defini- 

 tion of Basalt — Of Greenstone. — Localities oi Greenstone 

 Trap— In Massachusetts — New- Jersey— Columbia River — 

 Nova Scotia . . . . . . - . .271 



