LIST OF MAPS. 



500. Blake, W. P., and Hitchcock, C. H. 



Geological map of the United States. 



Atlas of the U. S. and the world by Gray, folio, Phila- 

 delphia, 1871; Statistics of mines and mining in the states 

 and territories west of the Rocky mountains, Sth report 

 by R. W. Raymond, Washington, 1873; Statistical atlas 

 of the United States based on results of the 9th Census, 

 1870, pis. xiii, xiv, Washington, 1875; Special report for 

 the Centennial, 1876; Smithson. Contr. Knowl., 1876; Die 

 Vereinigten Staaten von Nord-Amerika (F. Ratzel), i, 

 Miinchen, 1878. 



Connecticut is marked " Eozoic " except the Connecticut valley and 

 Pomperaug areas of "Jurassic and Triassic " rocks. Note states: 

 " There may be some metamorphic Palaeozoic formations included in 

 the Atlantic portions of the Azoic." 



501. Bradley, F. H. 



Geological chart of the United States east of the Rocky 

 mountains and of Canada. Folder, 16 bj^ 24 inches, New 

 York, 1875. 



The formations shown in Connecticut are: Archaean, all that part of 

 the state east of the Triassic; Lower Silurian, nearly all of western 

 Connecticut; Upper Silurian, in eastern Litchfield and western Hart- 

 ford county; Triassic, central Connecticut and Southbury. Scale ap- 

 proximately I inch^rpo miles. 



502. Chapin, J. H. 



Map showing the triangulation of Connecticut, by the 

 United States Surveys. 



]Meriden Sci. Assoc, Trans., iv, 51, 1890. 



Scale, -/3 inch :^ 10 miles. 



503. Crosby, W. O. 



i\Iap of the proposed sites of the dams in the valley of 

 the Housatonic and of the Tenmile river. 



Tech. Quart., xiii, No. 2, 123, 1900. 



A topographic map, showing the relations of the Tenmile and Housa- 

 tonic valleys, extending from Dover Plains to Pawling, including part 

 of the Housatonic river in Connecticut. Scale i inch=:2 miles. 



504. Dana, J. D. 



Topographic map of the New Haven region. 

 Connecticut Acad. Arts Sci., Trans., ii, 45, 1873. 



Extends north from the Sound to include Blount Carmel. In- 

 cludes Woodbridge hills on the west, and lake Saltonstall on the east. 



