24 CONNECTICUT GEOL, AND NAT. HIST. SURVEY. [Bull. 



Detailed description, with maps, sketches, and photographs, of the 

 four "rocks" of New Haven. Pine Rock and Mill Rock are dikes; 

 East Rock and West Rock are intrusions of a laccolithic character. (See 

 Dana, 71.) 



73. Dana, J. D, 



On Percival's map of the trap belts of central Connec- 

 ticut, with observations on the upturning, or mountain- 

 making disturbance, of the formation. 



Am. Jour. Sci., (3) xlii, 439-447, map (pi. xvi), 1891. 



Citation of the facts favoring ejection of trap after the great 

 mountain-making event of the valley; discussion of the character of this 

 mountain-making disturbance. 



74. Dana, J. D. 



Additional observations on the Jura-Trias traps of the 

 New Haven region. 



Am. Jour. Sci., (3) xliv, 165-169, 1892. 



Description of a s-inch trap dike at West Rock, branching from the 

 main rock mass. 



75. Dana, J. D. 



Manual of geology', 4th ed. 1,036 pp., 1,577 figs, and maps. 

 New York, American Book Co., 1895. 



Among the subjects dealing with Connecticut are Branchville mine, 

 331; Thimble islands, 949; copper mines, 745; iron mines, 127; marble 

 deposits, 524, 530, 531; Triassic, iii, 740-742, 751-755, 799-801; glacial 

 deposits, 194, 195, 443, 956, 970, 971; structure and age of Stockbridge 

 limestone and related rocks, 309, 527-532; Taconic system, 495-496; Tri- 

 assic strata were deposited in a valley and the traps are intrusive, 798- 

 808; fossils 750-756. 



(Dana's Manual is particularly rich in references to Connecticut 

 geology. — Ed.) 



76. Dana, James Dwight. (1813-1895.) 



Biograph3^ 



E. S. Dana: Am. Jour. Sci., (3) xlix, 1-28, 1895. 

 Beecher: Atn. GeoL, xvii, 1-16, 1896. 

 Williams: Jour. GeoL, iii, 601, 1895. 

 Le Conte : Geol. Soc. America, Bull., vii, 461-479, 1896. 

 Gilman: The life of James Dwight Dana, Harper and 

 Brothers, New York, 1899. 



77. Davis, C. H. S. 



The Catopterus gracilis. 



IMeriden Sci. Assoc, Trans., ii, 19-22, 1886. 



Description of a fossil fish, Catopterus gracilis, found in the bi- 

 tuminous shales at Little Falls, about two miles north of Durham 

 Center. 



