DABTON.] 



NORTH AMERICAN GEOLOGY. 



881 



Silurian — Continued. 

 West of the Appai.achiaus to the 

 Mississippi River, and Minne- 

 sota. 



1821. Travels through Northwest, 



Schoolcraft. 

 Structure of valley of the Mis- 

 sissippi, Nuttall. 



1822. Remarks on fossils from the 



lake regions, Bucklancl. 



Fossil tree 50 miles southwest 

 of Lake Michigan, School- 

 craft. 



Remarks ou lake regions, Dela- 

 field. 



1823. Geological features of Ten- 



nessee, Haywood, J. 

 Outline geologic map of Ten- 

 nessee, Sayler, N. 



1824. Expedition to sources of St. 



Peters River, Keating. 

 1826. Facts relating to parts of Ohio, 

 Atwater. 



1828. Vicinity of Louisville and 



Shippingsport Canal, L a p - 

 ham. 



1829. Certain Americau rock forma- 



tions, Vanuxem. 



1834. Strontiauite-hearing limestone 



on Lake Erie, Bigsby. 

 Ten days in Ohio, Am. Jour. 

 Sci. 



1835. Localities of bones of masto- 



don, Troost, etc. 



1836. Reconnaissance from Washing- 



ton through Wisconsin to 

 Coteau des Prairies, Feather- 

 stonhaugh. 



Region around Fort Winne- 

 bago, Miss., Ruggles. 



Analyses of limestones of Cin- 

 cinnati and Dayton, Ohio, 

 Locke. 



1837. Fourth report on Tennessee, 



Troost. 

 Observations on geology of 



Ohio, Laphara. 

 General sketch of geology of 



Ohio, Riddell. 



1838. Report on sonthern Ohio, 



Locke. 

 Report on Wood, Crawford, 



etc., counties, Ohio, Briggs, C. 

 First report of survey of Ohio, 



by Mather, Silliman. 

 Bull. 127 50 



Silurian — C ont i nued. 

 West op the Appalachians to the 

 SIississipi'i River, and Minne- 

 sota — Continued. 



1838. Geology of upper Illinois, 



Shepard, C. U. 



Report on Scioto and Hock- 

 hocking, Briggs, C. 



Section in southern Ohio, 

 Briggs and Foster. 



Report on Muskingum County, 

 etc., Ohio, Foster, J. W. 



Reports of survey of Ohio, 

 Mather. 



1839. Report of State geologist of 



Michigan, Houghton. 

 Reconnaissance of Kentucky, 

 Mather. 



1840. On the Silurian system, Conrad. 

 Exploration in Iowa, Wiscon- 

 sin, and Illinois, Owen, T>. D. 



Third report of State geologist 

 of Michigan, Houghton. 



Fifth report on Tennessee, 

 Troost. 



Report ou lead region of the 

 Upper Mississippi, Locke. 



1841. Geology of some regions west 



of the Alleghanies, Locke. 



Veins of northern peninsula of 

 Michigan, Houghton. 



Sixth report on survey of Ten- 

 nessee, Troost. 



Limite que sdpare le calcaire 

 de montagne, Verueuil. 



Northern part of lower penin- 

 sula of Michigan, Douglass. 



Geology of organized counties 

 of Michigan, Hubbard, B. 



Upper Mississippi region and 

 Cretaceous of the upper 

 Missouri, Nicollet. 



1842. Silurian and Devonian of the 



United States, Conrad. 



Notes on geology of the West- 

 ern States, Hall, J. 



Position of lead-bearing lime- 

 stone of the Upper Missis- 

 sippi, King, H. 



Lead regions of the Upper 

 Mississippi, Locke. 



Wisconsin and Missouri lead 

 regions, Hodge, J. T. 



Geology of third district of 

 New York, Emmons, E, 



