coarse - grained. Near 

 Nottingham the beds 

 are yellow or buff; but 

 farther north they be- 

 come red, though of a 

 paler tint than the 

 Lower Mottled. It is 

 noticeable that the in- 

 tensity of the redness 

 diminishes with the 

 increased size of the 

 sand - grains. Pebbles 

 and concavo-convex len- 

 ticles of red or green 

 marl may occur at any 

 horizon in the Bunter,, 

 and are fairly common 

 in the Lower Mottled 

 Sandstone. This sand- 

 stone varies in thickness 

 from about 30 feet at 

 Nottingham to 100 feet 

 near Annesley ; and the 

 thickness of the Pebble 

 Beds may be taken as 

 varying from 200 feet at 

 Nottingham to 400 feet 

 at Mansfield. 



The Middle Permian 

 Marl is a bright red 

 silty clay, with green 

 or greenish - white 

 bands and streaks, 

 which usually are finely 

 arenaceous. Its thick- 

 ness varies from about 

 10 to 20 feet. 



The Magnesian Lime- 

 stone is composed of 

 small rhombs of dolo- 

 mite, cemented by cal- 

 careous matter which is 

 dissolved on weather- 

 ing, when a porous 

 sandy-looking rock of a 

 yellowish colour results. 

 So striking is the re- 

 semblance of the rock 

 to sandstone that it has 

 sometimes been de- 

 scribed as such in 

 records of borings, and 



