216 



ready and certain remedy will be found by spreading upon every 

 acre a few bushels of newly made lime. 



Should these hints, which are designed to render useful cer- 

 tain portions of this lower stratum, receive their final corrobo- 

 ration from experience, we may consider that the area of the 

 region susceptible of improvement by marling without the expense 

 of hauling the material from a distance, has been in many districts 

 doubled or tripled in extent. To ascertain wheliier the clay pos- 

 sesses a sufficient share of the green granules to warrant a trial 

 of it upon the land, it may be necessary to employ the aid of a 

 small magnify in g-glass, which will be found by every farmer to 

 be of indispensable use in the discrimination of all greensand 

 marls. 



SECTION III. 



Limestone of Salem, Gloucester, and Burlington counties. 



Resting immediately over the greensand formation, we find 

 occasionally the locally developed and thin calcareous rock 

 ■which we have defined as the third formation of the upper se- 

 condary series. Though unimportant as regards its thickness 

 and the extent of surface which it occupies, it derives value from 

 its usefulness as a source of lime, in a district having no other 

 calcareous stratum, while considerable interest attaches to it, 

 from the number of its fossils, and its affinity to an extensive and 

 thick formation in the southern States, the lamer limestone of 

 Alabama. 



Geographical Extent. — The general range of the stratum is from 

 a point a little northeast of Salem, past Woodstown, Blackwood- 

 town, Mullica Hill, Vincentown, and New Egypt to Prospertown ; 

 beyond which I have been as yet unable to discover a trace of it. 

 But it is not to be inferred that it exists as a stratum of much 

 extent or importance throughout all of this long line. It has 

 hitherto been detected at distant points only, and nowhere but in 

 Mannington, Salem county, does it cover a wide area, or possess 

 more than a very insignificant thickness. It lies along the south- 

 eastern edge of the visible marl tract, and if it dips at all, it is 

 towards the southeast, to underlie the ferruginous sands. At its 



