No. 8.] BIBLIOGRAPHY OF CONNECTICUT GEOLOGY. 69 



Assoc. Adv. Sci., Proc, vi, 297-299, 1852. 



The shales and sandstones of the Connecticut Triassic are cited to 

 prove that all strata are not produced either by an interruption of 

 deposition or by a change in the quality of the material deposited. 



293. Wells, D. A. 



Evidences of glacial action in southeastern Connecti- 

 cut. 



Pop. Sci. Mon., xxxvii, 196-201, 1890. 



Description of several large glacial bowlders in the region between 

 Groton and Noank, at Fisher's island, and near Norwich. 



294. Wells, D. A. 



Remarkable bowlders. 



Pop-. Sci. Mon., xl, 340-346, 1892. 



Description of several large bowlders occurring at Montville, about 

 midway between Guilford and Leete Island, and in Massachusetts. 



295. Westgate, L. G. 



A granite-gneiss in central Connecticut. 

 Jour. Geol., vii, 638-654, 4 figs., map, 1899. 

 The gneiss at Maromas is shown to be igneous; its field relations and 

 petrography are described in detail. 



296. Whelpley, J. D. 



Trap and sandstone of the Connecticut valley. 

 Assoc. Am. Geol., Proc, vi, 61-64, 1845. 



Originally the sandstone area covered the Housatonic and Con- 

 necticut valleys and the space between. Woodbury and larger portions 

 in Connecticut valley preserved because they had hard trap dikes in 

 them. These dikes " acted as so many dams and headwaters against the 

 denuding flood," thus protecting the sandstone. The crescentic form 

 of dikes is due to irregularities of vent. 



297. Whitney, J. D., and Silliman, B., Jr. 



Notice of the geological position and character of the 

 copper mine at Bristol, Connecticut. 



Am. Jour. Sci., (2) xx, 361-368, 1855. 



The mine is situated at the contact of the sandstone and the meta- 

 morphic rocks. The copper ore (" vitreous and variegated " types with 

 some copper pyrites) is obtained from the micaceous and hornblende 

 slates, talcose micaceous slate, and sandstone. A history of the mine is 

 given; opened in 1836; not worked extensively until 1846. The sand- 

 stone is of Liassic age, and the metamorphic rocks belong to the 

 Paleozoic system. 



298. Whittle, C. L., and Davis, W. M, 



The intrusive and extrusive Triassic trap sheets of the 

 Connecticut valley. 

 Mus. Comp ZooL, Bull., xvi, 99-138, i pi., 1889. 



(See Davis and Whittle, 100.) 



