PEnsauken Formation — Local Details. 153 



May formation, and some of them may be of Pensauken age. 

 These patches of hilltop gravel are somewhat widely distributed. 

 North of Nut Swamp Brook, there is a series of these patches 

 on the divide at altitudes of 90 to 140 feet. The lower patches 

 occur down stream, the higher up stream, but all are within 2 

 miles of one another. The gravel caps are thin. Their range in 

 altitude is great, and possibly all are not contemporaneous. 



One to three miles west of Red Bank and south of Nut Swamp 

 Branch there is a similar series of gravel-capped hills at elevations 

 of 80 to i:i|2 feet. The gravel caps are several feet (10 to 15 

 feet) thick, and the gravel is - of quartz and ironstone, with 

 loam enough to cause the material to pack well. Cobbles of 

 Miocene quartzite are identifiable. All these beds of gravel 

 decline toward the stream now, though it is not certain that they 

 did originally. The material is, perhaps less well rounded and 

 coarser up stream, but differences are not conspicuous. Pebbles 

 of rock from the Red Bank formation, with abundant fossils, 

 are readily identified. 



Two isolated gravel-capped hills at 160 feet and 148 feet, 

 1 and 2^2 miles, respectively, east of Holmdel, line up with the 

 gravel patches last mentioned. There is a series of gravel-capped 

 hills east of Crawfords Brook, and east of Holmdel, declining 

 from 165 feet a mile northeast of Holmdel, to no feet near Hop 

 Brook, a distance of 3 miles. These might be interpreted as 

 marking an old course of Crawfords Creek, when its channel was 

 80 feet higher than now. 



A mile or less northwest of Holmdel are two hills with gravel 

 at their tops at 160 and 178 feet, respectively. 1 These are like 

 those east of Crawfords Brook, and clearly different from the 

 terraces along the stream here at 60 to loot feet. The latter are 

 regarded as of Cape May age. 



Two and one-half miles southwest of Colts Neck is a hilltop 

 bit of Bridgeton ( ?) at( 180 feet (Taylors pit). This goes with 

 the gravels on the hilltops 2 to 3 miles farther southwest, in the 

 vicinity of Jerseyville. 



South and southwest of Colts Neck, including the hills just 

 noted, gravel occurs at various levels, mostly capping isolated 



