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



153. Hobbs, W. H. 



Mineralogical notes. 



Am. Jour. Sci., (3) i, 121-128, 1895. 



Description of apatite and hessonite from a pegmatite vein in 

 Canaan. 



154. Hobbs, W. H. 



The river system of Connecticut. 



Jour. Geol., ix, 469-485, 2 figs., 2 maps (pis. i, ii), 1901. 



The rivers of Connecticut exhibit an orientation which corresponds 

 closely with the directions of a fault series observed in the Pomperaug 

 valley; the " trough lines " of streams are believed to owe their ex- 

 istence to faults. 



155. Hobbs, W. H. 



The Newark system of the Pomperaug valley. 

 U. S. Geol. Surv., 21st Ann. Rept., pt. iii, 7-160, 59 figs., 

 27 pis., 1901. 



The Newark system of the Atlantic slope in the light of recent 

 studies; previous work on the Newark rocks of the Pomperaug valley; 

 areal distribution of the Newark in the Pomperaug valley, and dis- 

 cussion of its relation to the basement floor of crystalline rocks; petro- 

 graphic and chemical description of type specimens of the region. Dis- 

 cussion of the elevation and tilting of the Newark beds; also of the 

 elaborate fault system of the region, — main direction of fault lines, 

 their expression in topographic forms, their origin, comparison with 

 other regions, fault lines, and drainage. Discussion of the steps in the 

 degradation and erosion of the region. 



(This paper deals with the Pomperaug area of Newark rocks after the 

 manner of treatment of the Connecticut valley area by Davis. This 

 paper and the one by Davis (98), contain all the important facts re- 

 garding the Connecticut Triassic. — Ed.) 



156. Hobbs, W. H. 



The old tungsten mine at Trumbull, Connecticut. 

 U. S. Geol. Surv., 22d Ann. Rept., pt. ii, 7-22, 1 fig., 5 pis., 

 1901. 



The tungsten minerals, wolframite and scheelite, are found at the 

 contact between a crystalline limestone and hornblende gneiss; the 

 formation of wolframite after scheelite is noticed, and the crystal- 

 lographic description of the two minerals is given. The associated min- 

 erals are mica, pyrite, pyroxene, scapolite, garnet, marcasite, limonite, 

 topaz, fluor-spar, margarodite, quartz, feldspar, apatite, sphene, ilmenite, 

 • calcite, zoisite, epidote, hornblende, chalcopyrite, malachite. The first 

 workings of the mine were for copper, lead, and silver. 

 (See Gurlt, 126; Hobbs, 159.) 



157. Hobbs, W. H. 



Still rivers of western Connecticut. 



Geol. Soc. America, Bull., xiii, 17-26, 3 figs., 2 pis., 1901. 



The Still river tributary to the Farmington, and that to the Housa- 

 tonic, owe their origin partly to geological structure of the region, and 

 partly to a damming of the valley by Glacial drift. 



