78 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Laurentian, Silurian and Triassic areas of Connecticut, are indicated 

 in color. Scale Yi inch=iioo miles. 



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



Geological map of the United States. 

 (See Blake and Hitchcock, 500.) 



544. Hitchcock, E. 



A geological map of the Connecticut valley. 



Am. Jour. Sci., (i) vi, facing p. i, 1823. 



Hand-colored map of the region adjoining the Connecticut valley 

 from Bellows Falls to New Haven. The area mapped in Connecticut 

 is bounded on the west by a line from West Hartford to Milford; on 

 the east by a line from Stafford to Saybrook. Formations shown are 

 granite (at Branford), gneiss, hornblende slate, mica slate, chlorite 

 slate, Primitive greenstone, argillite. Old Red sandstcfne, Secondary 

 greenstone, Coal formation, alluvion. Section near New Haven shows 

 dikes in Old Red sandstone. Scale i inch=:7 miles. 



(The boundaries of formations as shown on this map are only ap- 

 proximately those drawn by later observers. Map is dated 1822. — Ed.) 



545. Hitchcock, E. 



Geological map of Massachusetts. 

 Am. Jour. Sci., (i) x.xii, pi. i, 1832. 



Includes a strip about s miles wide along the north edge of Con- 

 necticut. Represents in color the following formations: mica slate, 

 argillaceous and flinty slate, limestone, scapolite rocks, gneiss, horn- 

 blende slate, granite. New Red sandstone, greenstone. Tertiary, talcose 

 slate. Scale approximately 4^ inches^30 miles. 



546. Hitchcock, E. 



Map of the course of bowlders and striae in North America. 



Assoc. Am. Geol., pi. vii, 1843. 



Includes northeastern United States, and a portion of Canada. 



547. Hitchcock, E. 



Geological map. 



Smithson. Contr. Knowl., ix, pi. iii, 1857. 



Surface geology, chiefly of the Connecticut valley. Includes a strif 

 10-15 miles on each side of the Connecticut river. Locates, in col«i, 



terraces, beaches, old river beds, ledges of rock, submarine ricl^ , okI 



sea bottom, osars. 



548. Hobbs, W. H. 



Geological map of the northwest corner of Connecti- 

 cut. 



Jour. Geol., i, pi. ii, 1893. 



Map includes an area of 26 square miles in the northwest corner 

 of the state, — one-third of the town of Salisbury, a portion of eastern 

 New York, and southwestern Massachusetts; shows areas of Everett 

 schist, Egremont limestone, Riga schist, Canaan limestone. Scale i 

 inch=:i mile. 



