257 



The marl seems not to be known much farther to the north- 

 west, in which direction there is a low range of hills of denu- 

 dation. 



Below the dam at Bargain's mill, on ihe Millstone creek, the 

 spurious marl stratum is visible again. At Lewis Perrine's, half 

 way between this and the Presbyterian church, the marl is found, 

 but not very good ; it lies rather high in the fields. The true 

 marl is known here as far west as Mr. Van's, two miles farther 

 towards the railroad on Rocky brook, one mile below Imlay's 

 mills. The quality is not known, but it is supposed to be the 

 inferior sort. 



At Willow Tavern or Clarksburg, a thin layer occurs in the 

 roadside, being a light-green marl with yellow specks. Beneath 

 this there is a whitish bed of siliceous sand with white clay and 

 a very few yellow and green specks. 



The ochrey olive hue, so common in the clay of the marl 

 region further to the southwest, is seen here upon the road, and 

 though no marl has been dug, I do not doubt its existing in this 

 quarter. Marl, declared to be good, has been found two miles 

 to the northwest of Willow Tavern. 



The country between this and Allentown is, for a certain dis- 

 tance, somewhat hilly, then flat and very sandy. Hills occur of 

 some magnitude near the head waters of Rocky brook, and 

 range from east to west. The highest is called Pine Hill, and is 

 the same which is seen so conspicuously from Hendrick Cono- 

 ver's insulated hill, as before noticed. We pass through a gap 

 in this range, in coming from the northeast to the Willow 

 Tavern. 



Two ranges of high grounds seem to extend in parallel direc- 

 tions to the southwest, one on each side of the road going to 

 Wrightsville, before reaching which place, however, the western 

 one is crossed. To the east is Cream Ridge. 



At the head of Montgomery's mill-pond, near Allentown, 

 Mr. Burden has dug in search of mark It is very poor (of the 

 spurious kind), no green grains being visible, and it tastes strongly 

 of copperas. At the rate of twenty loads to the acre it destroys 

 the crop. A very slight dressing, however, was thought to be 

 beneficial to potatoes. The stratum is the blue sandy clay 

 usually so astringent. 



22* 



