221 



Near Barnsboro. — Two miles and a half east of Barnsboro, 

 the calcareous stratum occurs near Mantua creek, on the farm 

 of Josiah Heritage. The layers of the rock are between six 

 and eight inches thick. It consists chiefly of comminuted frag- 

 ments of shells and other fossils, and scattered grains of ordinary 

 siliceous sand, and a few granules of greensand. It is a gray 

 limestone, the interior of the mass having some degree of com- 

 pactness, and promises with care in the calcination, to yield a 

 lime fit for the purposes of the agriculturist. 



Analysis of the Limestone overlying the Marl on the farm of Josiah 

 Heritage, near Blackicoodstoivn, Gloucester county. 



Description. — Yellowish-gray, granular, and subcrystalline, and 

 very fossiliferous. 



Composition. — In 100 parts : 



Carbonate of lime, - 75-0 



Carbonate of magnesia, - 1*8 



Alumina and oxide of iron, 2-5 



Insoluble matter, - - 18-7 



Water, - - - . 1-7 



99-7 



JVear Blachvoodstown. — Upon the southern branch of Timber 

 creek, the limestone is again met with south of Blackwoodstown. 

 As in the other localities above mentioned, its thin layers are di- 

 vided by more or less calcareous sand, a bed of which also overlies 

 it at this place. The relative order of the beds commencing with 

 the diluvium, and extending to the surface of the greensand 

 stratum, is as follows : 



1. Diluvial sand and gravel, - - . . 3 feet. 



2. Yellow ferruginous sand, - - - - 1 " 



3. Dark ferruginous clay, very tough, - - - 1 " 



4. Gray siliceo-calcareous sand, containing fossils 



similar to those of the underlying limestone, 2 " 



5. Yellowish-gray limestone, in thin irregular flaggy 



layers, contains several species of shells, and the 

 eschara digitata in considerable abundance, 2^ " 



6. Greensand marl, at the level of the stream. 



19* 



