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



Brief description of the trap formation in New Haven and vicinity, 

 mentioning their inclusions: zeolites, quartz, prehnite, etc. Slight dif- 

 ference between East and West Rocks and those in the region of East 

 Haven; i. e., no regular jointed structure in latter. 



235. Putnam, B. T. 



Notes on samples of iron ore collected in Connecticut. 

 Census of the U. S., loth Rept., xv, 83-87, map, 1886. 



Magnetic ore not found in the state in sufficient quantities to pay for 

 mining; specular hematite is almost unknown; spathic ore exists in the 

 vicinity of Roxbury, but is not mined; limonite the only ore mined. De- 

 scription of the Kent mine, the Chatfield mine near Salisbury, the 

 Brookpit or Ore Hill mine, the Porter mine at Lakeville, the Davis or 

 Forbes mine north of Lakeville, and the Chapin mine west of Chapinville. 

 Map showing location of iron mines accompanies these notes; sketch 

 of the Chatfield mine. 



236. Pynchon, W. H. C. 



The ancient lavas of Connecticut. 



Connecticut Quart., ii, 309-319, 17 reproductions from 

 photographs, 1896. 



Well illustrated, popular account of the trap ridges from Tariffville 

 to New Haven. 



237. Pynchon, W. H. C. 



Some common evidences of glacial action in Connecti- 

 cut. 



Connecticut Quart., iv, 294-302, 10 illus., 1898. 



A popular article on glacial action with illustrations taken from 

 Connecticut. Views show striated rock, till, perched bowlder, sand 

 plain, etc. 



238. Pynchon, W. H. C. 



Iron mining in Connecticut. 



Connecticut Quart., v. — I. Ores and ore beds, 20-26, 4 

 illus; II. Smelting, 232-238, 8 illus.; III. Historical 

 sketch, 277-285, 9 illus.; 1899. 



An account of all the mines within the state. Character of the 

 ores, methods of mining and smelting. An interesting description of 

 the great importance of the industry during the revolutionary period, 

 its decline and present condition. The Salisbury-Canaan region, with its 

 mines, is described and illustrated in detail. 



239. Pynchon, W. H. C. 



Drilled wells of the Triassic area of the Connecticut val- 

 ley. 



U. S. Geol. Surv., Water-Supp. and Irr. Paper No. no, 

 pp. 65-94, with sketch map and section, 1905. 



A sketch of the principal geological features of the area, followed by 

 descriptions of a considerable number of wells, in which several points 

 of interest are emphasized; the high percentage of mineral matter pres- 

 ent in all the water, the general absence of flowing wells. 



