218 



into lime, the potash and other ingredients of the green mineral 

 serving to vitriiy it and form a kind of slag. 



LOCAL DETAILS. 



Mannington. — The most southwestern spot at which this lime- 

 stone appears, is east of Mannington Hill, about three miles from 

 Salem. It occurs in the banks bordering the meadows of Man- 

 nington creek, on the farm of Miss Parrot, lying two or three 

 feet beneath the surface. The stratum here is of a light yel- 

 lowish colour, and consists of minute fragments of shells and other 

 fossils in a chalky state, together with grains of quartzose sand, and 

 a few granules of greensand, all invested by particles of carbonate 

 of lime. The rock is in thinly bedded layers from three to five 

 inches thick, accompanied by a calcareous sand, differing in no 

 respect but in the absence of cohesion from the material of the 

 limestone. This sand rests both above and between the more 

 solid layers. 



Analysis of the Limestone from the farm of Miss Parrot, near 

 Mannington Hill, Salem county. 



Description. — Colour, straw-yellow, granular, and subcrys- 

 taline; fossiliferous. 



Composition. — In 100 parts: 



Carbonate of lime, - - 81*35 



Carbonate of Magnesia, - 1-95 



Alumina and oxide of iron, 1-04 



Insoluble matter, - - 14-64 



Water and loss, - - 1-02 



10000 



On the farm of Mr. W. Petit, in the vicinity of Mannington 

 Hill, the limestone displays itself in considerable thickness, the 

 layers of the rock alternating with the calcareous sand as de- 

 scribed above. This locality is about a mile and a half south- 

 westward from the poor-house. 



The following analysis exhibits the proportion of carbonate of 

 lime in the limestone of this neighbourhood. 



