224 



Analysis of the Yellow Limestone, from the neighbourhood of 

 Eayrstoum, Burlington County. 

 Lime, . - - - 49-69 

 Carbonic acid, - - 38-31 



Silica and other impurities, 9-00 

 Water, .... 3-00 



100-00 



It is in many places a very pure limestone, containing ninety 

 per cent, of carbonate of lime. It has a structure somewhat 

 resembling certain varieties of the oolite of Europe, imparting to it 

 a granular and sandy aspect, which might lead the careless ob- 

 server to regard it as a more impure limestone than it is. 



SECTION IV. 



Ferruginous Yellow Sand — Formation IV. Brown Sandstone and 

 Conglomerate — Formation V. 



Geographical Range and Extent of the Yellow Ferruginous 

 Sand. — This formation occurs immediately above the greensand, 

 unless where the thin fossiliferous limestone intervenes, and 

 directly beneath the brown sandstone. Its position is usually at 

 the base and in the sides of the outlying hills capped by the sand- 

 stone, and it probably spreads extensively to the southeast of the 

 marl region in the district called " the pines." 



Geograjphical Fjxtent and Composition of the Brown Sandstone. — 

 The circumstances under which this stratum occurs, have in the 

 general way been already mentioned. The broivn sandstone is 

 found high upon the sides, or crowning the tops of all the insu- 

 lated hills scattered over this district of the State ; it lies in masses 

 of all dimensions, from considerable blocks to pebbles the size of 

 gravel, strewing the adjacent portions of the plain, and constituting 

 in fact, in its disintegrated state, an essential part of the surface 

 matter of the district. Being the only native material of the 

 nature of building stone, known or employed throughout the 

 lower section of the State, it becomes a matter of interest to 



