No. 8.] BIBLIOGRAPHY OF CONNECTICUT GEOLOGY. 25 



78. Davis, W. M. 



Brief notice of observations on the Triassic trap rocks 

 of Massachusetts, Connecticut, and New Jersey. 



Am. Jour. Sci., (3) xxiv, 345-349, 1882. 



Occurrence of traps in three distinct conditions: i. Dikes; 2. In- 

 truded sheets; 3. Overflow sheets. Discussion of origin, etc. 



79. Davis, W. M. 



The structural value of the trap ridge.s of the Connecti- 

 cut valley. 



Boston Soc. Nat. Hist., Proc, xxii, 1 16-124, 1882. 



Discussion of the Triassic problem, particularly in the Connecticut 

 valley. Connecticut strip of sandstone not greatly reduced from its 

 original area; its dip not the result of oblique deposition, but of post- 

 Triassic disturbance; most of the trap ridges are edges of contempo- 

 raneous overflows of lava, so may be considered as conformable mem- 

 bers of the sedimentary series, and serve as horizons to locate redupli- 

 cation of strata by (strike) faulting; the curvature, as well as the oc- 

 casional reappearance of the trap ridges, is the result of folding and 

 faulting. (See Davis, 98.) 



80. Davis, W. M. 



Abstract of " High river terraces of eastern Connecti- 

 cut," by B. F. Koons. 



Science, i, 19, 1883. 



Position of several terraces depends on ice-dams that existed during 

 the decline of the Glacial period. (See Koons, 181.) 



81. Davis, W. M. 



The distribution and origin of drumlins. 

 Am. Jour. Sci., (3) xxviii, 407-416, 1SS4. 



The place of drumlins in a geographical classification; terminology; 

 general description; distribution; origin — similar to that of sand-bars in 

 a river; discusses distribution and origin of some Connecticut drumlins. 

 (See Dana, 58,64.) 



82. Davis, W, M. 



On the relations of the Triassic traps and sandstones of 

 the eastern United States. 



Mus. Comp. Z06I., Bull., vii, 249-309, 1884. Abstract: 

 Neues Jahrb., 230-232, 1884; Science i, 430, 1883. 



Description of the Triassic formation seen at various places in New 

 Jersey, Massachusetts, and Connecticut — Beckley Station, Meriden, 

 Wallingford, New Haven. Brief statement of former views; literature; 

 discussion of the general relations and origin of the trap and sand- 

 stones; extrusive nature of most of the trap proved. (For complete 

 treatment of subject, see Davis, 98.) 



83. Davis, W. M. 



The structure of the Triassic formation of the Connecti- 

 cut valley. 



