5io 



J. F. KEMP AND J. G. ROSS 



Figure i. 



Outline map of known localities of basic dikes from New York to western 



Kentucky. 



of general occurrence, but that it has disappeared in the course 

 of decomposition, to which it is quite sensitive. P. F. Schneider 

 has noted that one of the dikes strikes N. 5 E., and this bear- 

 ing has been used in plotting the map here employed. 1 



] N. H. Darton and J. F. Kemp, "A New Intrusive Rock near Syracuse," 

 Bull. Geol. Soc. Amer., VI, p. 477, 1895. P. F. Schneider, "New Ex- 

 posures of Eruptive Dikes in Syracuse, N. Y.," Amer. Jour. Sci., July 

 1902, p. 24. See also Proc. Onondaga Acad, of Sciences, I, p. no, 1903. C. 

 H. Smyth, Jr., "Petrography of the recently discovered dikes at Syracuse, 

 etc.," Amer. Jour. Sci., July 1902, p. 26. E. H. Kraus, "A New Exposure 

 of Serpentine at Syracuse, N. Y.," Amer. Geologist, May, 1904, p, 330. 



