No. 8.] BIBLIOGRAPHY OF CONNECTICUT GEOLOGY. 23 



67. Dana, J. D. 



[Review of] " Gradual variation in intensity of meta- 

 morphism," by C. S. Middlemiss. 



Am. Jour. Sci., (3) xxxv, 82-83, 1888. 



Abstract of Middlemiss's statements in regard to the metamorphic 

 phenomena of India, and brief comparison with similar phenomena in 

 New England. 



68. Dana, J. D. 



[Review of] " Subaerial decay of rocks and origin of the 

 red color of certain formations," by I. C. Russell. 



Am. Jour Sci., (3) xxxix, 317-319, 1890. 



In contrast with Russell's views Dana believes that the absence 

 of red earth in the crystallines is due to the character of the o.xidation, 

 and that the red color of the sandstones is due to changes subsequent 

 to deposition. (See Russell, 252.) 



69. Dana, J. D. 



Archaean limestone and other rocks in Norfolk, Connec- 

 ticut. 



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



Brief mention of a small area of limestone associated with hard 

 gneiss, granite, and some hornblendic rocks, at Norfolk; limestone con- 

 sidered as Archaean. Brief mention of magnetite vein two and one- 

 half miles east of Norfolk, that had been opened and worked for a 

 time. 



70. Dana, J. D. 



Archaean axes of eastern North America. 



Am. Jour. Sci., (3) xxxix, 378-383, 1890. 



Division of eastern North America into ranges and troughs which 

 were areas, for the most part, of independent geological work. Men- 

 tions a Connecticut valley trough. 



71. Dana, J. D. 



On the four Rocks of the New Haven region. 120 pp., 

 7 pis., maps (pis. i-iii, vi). New Haven, 1891. 



Detailed description of East Rock, West Rock, Pine Rock, and Mill 

 Rock. They are intrusions of dolerite into upturned sandstone. East 

 Rock and West Rock are of laccolithic origin. Pine Rock and Mill 

 Rock are trap dikes. " Mount Carmel appears to be a combination of 

 dikes." Pp. 41-120 describe the geology along certain walks and 

 drives about the New Haven region, including Meriden, Maltby Park, 

 Woodbridge, the shore line from Savin Rock eastward, including ex- 

 cursions to Branford, Stony Creek, and the Thimble Islands, Saltonstall 

 ridge, and the North Haven clay deposits. 



72. Dana, J. D. 



Some of the features of non-volcanic igneous ejection, 

 as illustrated in the four " rocks " of the New Haven re- 

 gion — West Rock, Pine Rock, Mill Rock, East Rock. 



Am. Jour. Sci., (3) xlii, 79-110, 6 pis., maps (pis. ii, iii, 

 vi), 1891. 



