14 



GEOLOGY. 



New Jersey and New York alone being about 75. 1 Most of these 

 faults are small, but two of them are of the first order. These two 



Fig. 317.— Section showing the structure of the Newark series, just north of Holyoke, 

 Mass. Os = Savoy schist, probably Ordovician; Cv) = granite of Carboniferous 

 age ; Ts = Sugarloaf arkose ; Tg = Granby tuff ; Tb = Blackrock diabase (intrusive) ; 

 Th= Holyoke diabase (extrusive), and Thp = Hampden diabase (extrusive), mem- 

 bers of the Newark series of the Triassic. (Emerson, U. S. Geol. Surv.) 



are strike faults, each of such magnitude as to cause the repetition at 

 the surface in western New Jersey of all three divisions (Stockton, 



Fig. 318. — Map showing the area where a sheet of igneous rock now appears at the 

 surface. The peculiarities of distribution are the result of faulting. (Hobbs 

 U. S. Geol. Surv.) 



Lockatong, and Brunswick) of the Newark series (Fig. 321). These 



1 Kummel, Jour. Geol., Vol. VII, pp. 23-52 — an excellent summary of the Newark 

 series of New York and New Jersey. More detailed descriptions of these faults, and 

 the structure of the New Jersey-Newark generally, are set forth by the same author 

 in the Annual Reports of the State Geologist of New Jersey for the yesirs 1896 and 

 1897, and more briefly in the Journal of Geology, Vol. V, 1897, p. 541. Some of the 

 faults of the Newark in New Jersey had been earlier recognized by Cook, Smock, 

 Lewis, Dartori, Russell, Lyman, and others, described elsewhere. See also New 

 York folio, U. S. Geol. Surv. 



