338 



A Sketch of the Natural History of 



Description of the Strata, 



;} 



Ditto still darker, containing more of the white 

 spar, sulphureous, effervesces briskly, but doe 

 not contain any slack after burning - 



Ditto, light coloured .... 



Ditto, still lighter coloured than the above . 

 Ditto, much darker, containing white powdery") 



matter . - - - - -J 



Dai k chinch, a clayish stratum - 

 Dilto ditto, - - ditto - - 



Very flark coal shale, rather soft iu boreing 

 Ditto dilto ..-.--. 



Ashcoloiired metal stone- .... 



Very hard brown stone, perhaps ironstone - 

 Ash-coloured chinch and bind - - . - 

 Dark bituminous shale, with soft partings - 

 Verv hard close textured sandstone - . - 

 Sandstone with bhie streaks, soft in boreing - 

 Very hard limestone mixed with freestone - 

 Grey shivery sandstone, rather soft , - . 

 Sandstone, mixed with limestone, very hard in? 



boreing - - - - - - -) 



AsJi-coloured metal stone, rather soft . - . 

 Hard caking COAL .... 



Black clunch, pavement of the coal 



Hard splent COAL . . . - 



Black-burning shale, like Cannel coal 



Very hard stone, perhaps ironstone 



Black shale . . - - . 



Very hard stone - - - - - 



Soft black shale, speckled with white powdery \ 



matter - - - - - -J 



Hard black-burning shale came up in the augur.i 



in large pieces, very promising, and not yet cut > 



through - - - - - -J 



Total depth bored 



Ilepth of 



each 

 Stratum. 



Ft. In. 



2 



XLIX. A Sketch of the Natural History of the Cheshire 

 Rock- Salt District. By Hejory Holland, Esg. Ho- 

 norary Member of the Geological Society. 



[Concluded from p. 158] 



General Situation, Thickness, &c. of the Beds of Rock- Salt. 



JL HOUGH springs iinpregnated with salt occur in several 

 parts of the Cheshire plain, it may be remarked that the 

 rock-salt itself has only been worked into, near the banks 

 of the Weaver and its tributary streams. It was first dis- 

 covered at Marbury near Northwich, about one hundred 



and 



