Bridgeton Formation — Local Details. 51 



Arneys Mount is capped with Cohansey sand. Apple Pie Hill 

 has a few feet of gravel, which is regarded as a remnant of the 

 Beacon Hill formation. The gravel is 0;f quartz and chert, in 

 proportions of about 4 to 1, with a little sandstone and quartzite. 

 If the Beacon Hill formation once covered Arneys Mount, as it 

 probably did, it was at a level higher than the top of the present 

 hill. Scattered pebbles of Beacon Hill type on the crest of the 

 hill suggest such a former covering. 



A plain from Apple Pie Hill (208 feet) to Bear Swamp Hill 

 (165 feet), and to another 147-foot hill to the southeast, would, 

 if carried northwest, have an elevation of about 250 feet at 

 Arneys Mount (20 feet above its top). This probably represents 

 about the appropriate level of the former Beacon Hill cap here. 

 Carried southeastward, such a plain would have an elevation of 

 140 to 160 feet at Munion Field, and this is probably the approxi- 

 mate Beacon Hill level of that region. 



Fearings Hill (about 2 miles northwest of Fountain Green) 

 has about the same altitude as Houghtons Hill. Its gravel cap 

 has the same topographic relations as the gravel on Houghtons 

 Hill (Fig. 24), Point Pleasant (Camden County) (Fig. 22), and 

 Jacobstown (Fig. 33), and is referred to the Bridgeton forma- 

 tion. The gravel itself is not of such a character as to give 

 especial force to this correlation. 



Northwest of Apple Pie Hill (South Park) there are gravel 

 beds 4 to 10 feet thick, at an altitude of about 140 feet, which 

 probably are Bridgeton (possibly Pensauken). The same may 

 be said of the gravel about Munion Field at elevations of about 

 120 feet. 



Some of the features of these gravels which seem difficult of 

 explanation are probably connected with the shifting of the main 

 divide of the region from near Arneys Mount, to its present 

 position, near Apple Pie Hill. 



Constitution. — The gravels at South Park, at an altitude of 

 about 140 feet, and in the vicinity of Bear Swamp Hill, at 120 

 to 160 feet, consist mainly of quartz and chert, but they contain 

 bits of ironstone, which seems to rule them out of the Beacon 

 Hill formation. The absence of the ironstone, so far as ex- 



