CONTENTS. 7 



CHAPTER VIII. 



Economical Geology. 



Building materials in the vicinity of San Francisco. — San Francisco sandstone.— Granite from Hong Kong. — Of Tomales 

 bay. — Limestone of Tomales bay.— Sandstones of Benicia. — Sandstone and trap of Vacaville. — Want of building stone on 

 the Sacramento and Feather rivers. — Trap near upper end of the valley. — From Fort Reading to the Columbia, trap every- 

 where on our route. — Gold. — No new deposits discovered. — Country covered by recent volcanic matter. — Gold at Port 

 Orford. — Coal. — Efforts to find true coal on the western coast. — Coose bay coal. — Geological position. — Physical and 

 chemical characters. — Economical value. — Coal of Bellingham bay. — Geological position. — Extent and thickness of the 

 beds. — Associated fossils.— Miocene flora. — Lignite beds of the upper Missouri.— Chemical and physical character of Bel- 

 lingham Bay coal. — Its economical value. — Coal of Vancouver's island. — Geological position. — Cretaceous rocks. — Parallel- 

 ism of the chalk and tertiary of the upper Missouri, with similar strata on the Pacific coast. — Physical character of the coal, 

 and its chemical composition.— Coal of Cape Flattery probably the equivalent of the lignites of the Cowlitz and Coose bay.— 

 Coal of Santa Clara, California.— Coal market of San Francisco. — Coal of the Lota mine, Chili. — Coal of Australia.— Coal 

 from the eastern States. 



No. 2. 



DESCRIPTION OF THE TERTIARY FOSSILS COLLECTED ON THE SURVEY. 



BY T. A. CONRAD. 



No. 3. 



REPORT UPON AN ANALYTICAL EXAMINATION OF WATER AND 

 MINERALS FROM THE HOT SPRINGS IN DES CHUTES VALLEY. 



CONDUCTED UNDER THE DIRECTION OF PROFESSOR E. N. HORSFORD. 



No. 4. 



CATALOGUE OF THE MINERALS AND FOSSILS COLLECTED ON THE 



SURVEY. 



