176 THE JOURNAL OF GEOLOGY. 



correlation of the New Jersey greensands, but does not attempt 

 to separate the individual members of the series beyond the ref- 

 erence of the upper member to the Eocene, as was also done by 

 the writer^ in his report upon the Eocene. It is impossible 

 however, to satisfactorily correlate this upper member of the 

 greensand series with the Eocene elsewhere, and it is not known 

 how much of that horizon is included in it. It has been gener- 

 ally thought to represent the Lower Eocene of other regions. 

 Concerning the other formations of the greensand series there 

 seems to be little doubt of their reference to the Upper Creta- 

 ceous, although they probably do not include its earlier portions. 

 Many of the same species have been found in the Cretaceous 

 areas of the South Atlantic and Gulf States. Stanton^ has 

 recognized thirty-five species as identical in Alabama, eighty- 

 six in Mississippi, and fifty-four in Texas. Some of the species 

 which are very much restricted in the New Jersey area, appear 

 to have a greater vertical range in the Gulf region. It is 

 therefore very difficult to delimit equivalent horizons. It is 

 not unlikel_y that a fuller knowledge of the formations may ren- 

 der it possible to make more detailed correlations, but at present 

 it is impossible. 



On these grounds, therefore, an independent classification of 

 the New Jersey deposits is demanded. The objections to the use 

 of lithologic terms have been already cited, as well as the 

 grounds for employing the place names adopted. 



GENERAL CONCLUSIONS. 



The greensand strata of New Jersey constitute a conformable 

 series of beds aggregating nearly 550 feet in thickness. During 

 the Matawan epoch, when fully one-half of these deposits were 

 being laid down, land-derived materials reached the sea in large 

 amounts, frequently interfering with the formation of glauconite, 

 which is much less prominent at this horizon than later. During 

 the succeeding epochs the production of greensand was much 



'Bull. U. S. Geol. Survey, 83, i8gi, 173 pp. 

 ^Bull. U. S. Geol. Survey, 82, 1891, p. 84. 



