14 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuIL 



18. Cooper, T. 



On volcanoes and volcanic substances, with a particular 

 reference to the origin of the rocks of the floetz trap- 

 formation. 



Am. Jour. Sci., (1) iv, 204-241, 242-243, 1822. 



Discusses action of water on stones and earth of globe's crust; gives- 

 large number of facts concerning volcanoes and their products; proves- 

 igneous origin of floetz trap by comparison with modern lavas, etc., as. 

 disproving the Wernerian theory that the floetz trap was of aqueoiis 

 origin. In this discussion the trap formations of Connecticut are used, 

 as examples. 



19. Cornish, R, H. 



Glacial scratches in vicinity of Norfolk, Connecticut. 

 Am. Jour. Sci., (3) xxxix, 321, 1890. 



Brief statement of direction of glacial stride in the vicinity of Nor- 

 folk; mean direction is S. 33° E. 



20. Crosby, W. O. 



Notes on the geology of the sites of the proposed dams- 

 in the valleys of the Housatonic and Ten Mile rivers. 

 Tech. Quart., xiii, pp. 120-127, IQOO. 



The Housatonic river formerly flowed through the Ten Mile river and" 

 Swamp brook, through Pawling into the Croton drainage system; 

 its present course through the crystallines is due to the fact that it 

 was established on Cretaceous strata sloping southeastward, and has 

 since maintained its direction in spite of later erosion; other changes 

 have taken place in the river system, due to Glacial deposits. The site 

 of the proposed dam in the Housatonic valley is about one mile south 

 of Merwinsville, and of the dam in the Ten Mile valley about one-half 

 mile above Webatuck. 



21. Dana, E. S. 



Trap rocks of the Connecticut Valley. 



Am. Jour. Sci., (3) viii, 390-392, 1874; Am. Assoc. Adv.- 

 Sci., Proc, xxiii, pt. ii, 45-47, 1874. Abstract: Neues 

 Jahrb., 427, 1875. 



Microscopical and chemical description of the Connecticut traps; 

 closely similar to trap from Nova Scotia, New Jersey, Pennsylvania,^ 

 and North Carolina; composed of pyroxene, labradorite, and magnetite, 

 with chrysolite and apatite; chlorite is present as alteration product. 

 Two types: anhydrous (West Rock, etc.), and hydrous (Saltonstall 

 ridge). 



(This paper is " the first important memoir in Petrography published. 

 in this country." — Ed.) 



22. Dana, E. S. 



On the occurrence of garnet with the trap of New 

 Haven, Connecticut. 



.\m. Journal Sci., (3) xiv, 215-218, 1877. 



Description of garnets found in the trap of East Rock and Mill' 

 Rock. Brief description of the associated minerals, — magnetite, pyrox-- 

 ene, opalite, and calcite. Chemical analyses and drawings. 



