12 



CARBONIFEROUS LAMELLIBRANCHIATA. 



General Sequence op the Carboniferous Rocks op North Staffordshire, 

 Derbyshire, South Yorkshire, and Lancashire. 



Coal Meastjkes 



Millstone Geit 



O H 



w o 



^ o p. [ 



^ H S 



S '^ - -^ 



S5 ttJ — \ 



Bed beds, clays, sandstones, then coals ; black band ironstones and 



fresh-water limestones. 

 Productive measures. Clays, sandstones, coals, and ironstones. 

 Gannister series with occasional marine beds ; gannister rock, 



shales, clays, and coals. 



^Erom one to six beds of grits separated by shales, and occasionally 

 a seam or two of coal, having the Shale, Pendle, or Farey's 

 grit as the base. /Eough "Well or first grit. 



Haslingden flags or second grit. 



Chatsworth, Ravelin, Roaches, or 



(third grit. 

 Kinderscout or fourth and fifth grit. 

 Pendle, Farey's, or sixth grit. 



Shales with thin beds of hard close-grained sandstone. 



o 



n 



(< CO I 



TOREDALE SeEIES 



Mountain Limestone Black shales and limestones. 



Carboniferous or Mountain limestone. 



In North Yorkshire the Carboniferous series alters in its lithological characters, 

 the great mass of limestone which exists in the south becoming divided into beds 

 by intervening beds of sandstones and shales. The following section is taken from 

 the Geological Survey Memoir, ' The Geology of the Country round lugleborough. 



Caeboniferocs Limestone 



Series 



.Chert beds, sandstone, and shale 



Main limestone 



Sandstone and shale 



Underset limestone 



Sandstone and shale with two limestones 

 Toredale/ Middle limestone . 



Sandstone and shale 



Simonstone limestone 



Sandstone and shale 



Hardraw scar limestone 



Sandstone and shale 

 Gayle limestone. 

 Shale thinning to the south . 

 Hawes limestone. 



Sandstone and shale thinning south 

 Limestone (Great Scar) 

 Basement conglomerate. 



Feet. 



to 90 

 50 „ 100 

 70 „ 110 



,, 80 

 100 „ 345 

 15 „ 110 

 30 „ 150 

 15 „ ()0 

 30 „ 180 

 25 ,, 80 



„ 140 



„ 9 



„ 14 

 ? 600 



