CRETACEOUS AND TERTIARY FORMATIONS. 19 



Vincent own. — Below Vincentown . the limesand (Vincentown 

 sand) and Navesink-Hornerstown marl are exposed in a line of 

 pits extending for two miles or more down stream to Eayres- 

 town. At Vincentown and upstream for a mile or more the 

 Manasquan marl was formerly dug. It seems best to refer to 

 the Manasquan the specimens credited to Vincentown except 

 where their occurrence in the limesand beds is expressly stated. 



Blackivoodstown. — South of Blackwood are old pits in the 

 Xavesink-Hornerstown marl, which is here overlaid by the 

 Vincentown limesand and that in turn by the Kirkwood 

 (Miocene) sand. Specimens from "the greensand at Black- 

 Avoodstown" are clearly from the combined Navesink-Horners- 

 town bed. Other specimens may be from the Vincentown or the 

 Miocene. 



Barnsboro. — There are no marl beds at Barnsboro, but in the 

 A-alleys of several branches of Mantua creek from one to three 

 miles east, south and west of the village, there are numerous 

 exposures of the Navesink-Hornerstown marl and several old 

 pits, once extensively worked. The material from "Barnes- 

 borough" probably came from these pits. The Vincentown 

 limesand is found at some points in the vicinity and above that 

 the Kirkwood sand, either of which horizons may have fur- 

 nished some specimens. 



Mullica Hill. — A prominent bluff within the village and just 

 south of the creek at Mullica Hill has always been a favorite 

 collecting ground. The conspicuous feature of the section is a 

 "5-foot indurated shell bed, filled with fossils. The matrix in 

 Avhich the fossils are imbedded is sandy, with pea-like quartz 

 pebbles, the whole colored dark green by a considerable per- 

 centage of glauconite. Above the shell bed is a nearly pure 

 greensand marl, while beneath it there are exposed 20 feet or 

 more of yellow or red quartz sand containing poorly preserved 

 casts of Belemnitella americana, Gryphtza and Neithea." This 

 sand is the Mount Laurel sand, while the shell bed and overlying 

 glauconite bed represent the Navesink marl and perhaps a por- 

 tion of the Hornerstown marl, which, in this portion of the State, 

 are not separated by any intervening horizon. Since the fossils 

 collected at this exposure probably came chiefly from the shell 



