ii4 Quaternary Formations of Southern New Jersey. 



North, west, and south of Fearings Mount, hilltop patches of 

 gravel at I20± feet are to be correlated with each other, and 

 perhaps with the Pensauken. The amount of gravel is small, but 

 perhaps enougjh to suggest the approximate altitude of the 

 Woodstown Plain. At other places in the vicinity, bare Cre- 

 taceous appears at about the same level. Glauconitic loam is 

 more conspicuous than gravel at the surface in much of this 

 area. The gravel is limited to the contact of the Cretaceous and 

 the sandy loam above. The slopes above and below 120 feet are 

 more commonly bare Cretaceous than are surfaces at about that 

 level. Similar areas occur on the divides west of Jobstown. 



In the vicinity of Georgetown are numerous small patches of 

 gravel classed as Pensauken. These range up as high as 140 

 feet, but are thickest somewhat lower. Half a mile south of 

 Georgetown a pit shows 6 to 8 feet of gravel, with a mixture of 

 glauconitic sand and marly loam. Seventy-five to ninety per cent, 

 of the gravel is of ironstone, mostly fine, but with some coarse 

 gravel and cobbles. In the sand of the formation, grains of the 

 sort common at the contact of the Navesink and Mount Laurel 

 formations are abundant, showing the source of same at least 

 of the material of the sand. Other exposures of gravel west 

 of Georgetown show the same general features. All about 

 here, the matrix of the gravel is glauconitic sand and marly 

 loam. The ridge northwest of Jobstown, and between Barkers 

 Brook and Assiscunk Creek has a heavy cover of it. The next 

 divide to the southwest has less, but enough to conceal what is 

 below, so as to make correlations difficult. Glauconitic sands in 

 the surface deposits are also common over most of the area 

 between Mount Holly and Georgetown, where they run up to 

 120 feet, and on Arneys Mount even higher. A similar glau- 

 conitic mantle appears in the valley of the Rancocas south of 

 Arneys Mount, and in the valleys of Crosswicks and Blacks 

 creeks to the northwest of Georgetown. 



This surface green loam is doubtless connected in origin with 

 outcrops of Cretaceous beds of marl, but the conditions of its 

 deposition are not altogether clear. It is conceivable that the 

 upper parts of the valleys in this region were not aggraded as 



