ri 



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 25'7 



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 ol Greenstone 

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

 Nova Scotia 27i 



