8o Quaternary Formations of Southern New Jersey. 



Milford. Deacons Station is about in line with Neshaning- Creek 

 (Pa.), which crosses Triassic beds. 



3) Stockton sandstone like that quarried at Stockton, is found 

 at many points. Since this sandstone is somewhat widespread, 

 the material in the Pensauken need not have come from the 

 immediate banks of the Delaware. Conglomerate from the 

 Stockton formation is found with the sandstone. 



4) Red shale and sandstone from the Brunswick division of 

 the Newark series, and perhaps from other formations. It is not 

 certain that all the red sandstone is from the Newark series. In 

 the Bridgeton formation, a piece of red rock was found, very 

 like the Newark sandstone petrographically, which contained a 

 Pennsylvanian (late Carboniferous) fossil. 



5) Pieces of igneous rock from the Newark series. 



6) At the northeast, pieces of conglomerate which are prob- 

 ably from the Green Pond Mountain formation. 



7) Granite pebbles and bits of gabbro, the sources of which 

 are not known. 



8) Ironstone fragments, derived from the Coastal Plain for- 

 mations (Cretaceous and younger) older than the Pensauken. 



9) Quartz pebbles, some of which show a peculiar columnar 

 structure as they weather. Vein quartz from which they might 

 have been made is found in the Martinsburg (Hudson River) 

 formation of the northwestern part of the State. As constituents 

 of the Pensauken formation, these quartz pebbles probably came 

 from older formations of the Coastal Plain. 



10) Chert pebbles, derived, like the last, from the Tertiary 

 and early Ouarternary formations of southern New Jersey. 



11) Glauconitic sand from the Cretaceous is prominent, as 

 already noted, along the southeastern border of the main Pen- 

 sauken belt. 



Subdivisions. — Between South Amboy and Woodbury a three- 

 fold subdivision of the Pensauken is recognizable in some places, 

 but not in all. (1) The basal member is a thin bed of gravel, 

 in many places coarse, generally carrying some crystalline rock 

 material and some shale. Bowlders are not altogether wanting — 

 are, indeed, much more common than in any other part of the 



