CHAPTER XL 



THE TINTON BEDS. 



In his discussion of the "red sand," Cook recognized an upper 

 division which he designated as the "indurated green earth," 1 

 and Clark followed Cook in including this bed in the Red Bank 

 sand. These beds, however, are somewhat different from the 

 subjacent sand beds, especially in the much larger content of 

 glauconite and in the induration of the sediments. In the deep 

 cut at Beers Hill, on the Keyport and Holmdel turnpike, the entire 

 thickness of this formation is exposed, about 12 feet in all, the 

 basal portion of the formation being locally a nearly pure green- 

 sand marl. At Tinton Falls, where this formation is 22 feet in 

 thickness, the indurated sediments are responsible for a waterfall 

 in a tributary of the Swimming River. Not only are these in- 

 durated beds lithologically distinct from the Red Bank sand, but 

 the fauna also is quite different, it consisting largely of a recur- 

 rent Navesink element. Because of this faunal and lithologic 

 differentiation of the bed it has seemed advisable to distinguish 

 it by a special name, and the name Tinton beds has been proposed 2 

 and will be used here. 



In its geographic distribution the Tinton formation cannot be 

 differentiated beyond the point where the Red Bank sand is 

 typically developed, the most southwestern locality observed 

 where the bed can be certainly recognized being at Red Valley. 

 In eastern Monmouth County the formation can always be 

 recognized in its proper position in the section, unless it is too 

 deeply covered with superficial deposits. 



1 Geol N. j., 1868, p. 268. 



"Jour. Geol., vol. 13, p. 81 ; also, Geol. Surv. N. J., Am. Rep. State Geol., 

 for 1904, p. 155. 



10 PAL (145) 



