No. 8.] BIBLIOGRAPHY OF CONNECTICUT GEOLOGY. I9 



Metamorphic or eruptive. Many illustrations from Connecticut locali- 

 ties, including labradiorite, diorite schist, and porphyritic granite, New 

 Haven; granite. Stony Creek; limestone, Canaan. 



46. Dana, J. D. 



[Review of] " On the physical history of the Triassic 

 formation in New Jersey and the Connecticut valley," by 

 I. C. Russell. 



Am. Jour. Sci., (3) xvii, 328-330, 1879. 



Objection to Russell's statement that the Connecticut and New Jersey 

 Triassic areas are the opposite parts of a once continuous anticline 

 with a thickness of sandstone of 25,000 feet. (See Russell, 249, 251, 

 268.) 



47. Dcma, J. D. 



On the Hudson river age of the Taconic schists, and on 

 the dependent relations of the Dutchess county and west- 

 ern Connecticut limestone belts. 



Am. Jour. Sci., (3) xvii, 375-388, map, 1879. 



The Taconic schists are of the age of the Hudson river group; the 

 limestone belts of western Connecticut and eastern New York are 

 but outcropping bands of the Lower Silurian limestone formation, 

 brought to the surface by a series of flexures. 



48. Dana, J. D. 



Note on the age of the Green mountains. 

 Am. Jour Sci., (3) xix, 191-200, 1880. 



Evidence for embracing the whole region between the Connecticut 

 and the Hudson (and to an unascertained distance beyond) withi«i the 

 limits of a Green mountain synclinorium of Lower Silurian age. 



49. Dana, J. D. 



On the geological relations of the limestone belts of 

 Westchester county, New York. 



Am. Jour. Sci., (3) xx, 21-32, 194-220, 359-375, 450- 

 456, 3 pis., 1880; xxi, 425-443, I Pl-, 1881; xxii, 103-119, 313- 

 315, 327-335, 1881. 



Description and discussion of the general geological relations of the 

 limestone, schist, and gneiss of New York and western Connecticut, to 

 prove that these limestones and conformably associated metamorphic 

 rocks are of Lower Silurian age. 



50. Dana, J. D. 



Dolerite (trap) of the Triassic-Jurassic area of eastern. 

 North America. 



Am. Jour. Sci., (3) xxii, 230-233, 1881. 



Criticism of Dr. Hawes's method of dolerite analysis by specific- 

 gravity mixture. The recognition of anorthite and albite as con- 

 stituents of West Rock trap is not warranted by the facts. (See- 

 Hawes, 128, 129, 130.) 



