No. 8.] BIBLIOGRAPHY OF CONNECTICUT GEOLOGV. 79 



549. Hobbs, W. H. 



Geological map of portions of Sheffield, Massachusetts, 

 and Salisbury, Connecticut. 

 Jour. GcoL, i, 785, 1893. 



Map of a portion of the Housatonic valley east of Mount Wash- 

 ington. The geological structure is indicated. Shows areas of quartzite,- 

 Egremont limestone, Everett schist, Riga schist, Canaan dolomite, 

 tremolitic limestone. Scale i inch=:i mile. 



550. Hobbs, W. H. 



Geological map of the Pomperaug valley, Connecticut. 

 U. S. Geol. Surv., 21st Ann. Rept., pt. iii, pi. i, 1901. 



Locates, in color, the following formations: Schist, gneiss, granite, 

 conglomerate, sandstone, shale, basalt (anterior), shale and limestone 

 (anterior), basalt (main), basalt (vesicular); also fault lines. Scale 

 I inchiz:! mile; contour interval 20 feet. 



551. Hobbs, W. H. 



Areas occupied by the Newark system. 



U. S. Geol. Surv., 21st Ann. Rept., pt. iii, pi. ii, 1901. 



Trap and sediments of the Newark system in Connecticut located. 

 Scale I inchr=i20 miles. 



552. Hobbs, W. H. 



Geological map of the vicinity of South Britain, Con- 

 necticut. 



U. S. Geol. Surv., 21st Ann. Rept., pt. iii, pi. viii, 1901. 



Locates, in color, the following formations: Sandstone, conglomerate, 

 gneiss (higher, lower), arkose (higher, lower), shale (anterior), basalt 

 (higher, lower, lowest), shale (posterior); also fault lines and cold 

 springs. Scale 4 inches:z:i mile. 



553. Hobbs, W. H. 



Geological map of Orenaug hill, Woodbury, Connecti- 

 cut. 



U. S. Geol. Surv., 21st Ann. Rept., pt. iii, pi. x, 1901. 



Locates, in color, the following formations: Gneiss (higher, lower), 

 arkose (higher, lower), basalt (higher, lower, lowest), shale (posterior), 

 hornblende rock, sandstone, conglomerate; also cold springs and faults. 

 Scale I inchzi:j4 mile. 



554. Hobbs, W. H. 



• Topographic map of the Pomperaug valley, Connecticut. 

 U. S. Geol. Surv., 21st Ann. Rept., pt. iii, pi. xiv, 1901. 

 Embraces an area 7H miles east and west by 10 miles north and 

 south (approximately). Scale i inch^ri mile; contour interval 20 feet. 



555. Hobbs, W. H. 



]\Iap to illustrate the supposed stages in the erosion his- 

 tory of the Pomperaug basin, in the cycle which was ini- 



