Murchisons Silurian System. 



213 



Passage 

 from 



Lower 

 New Red 

 into coal 

 measures 



i 



Shaft section of the Coalpits at Uffington. 



Drift clay with boulders or red gravel, - - 

 Red clods, ----------- 



Poundstone, ---------- 



Red clods, ----------- 2 



Grey clods, dark colours above, light below, 

 Poundstone, ---------- 



Red curly rock, --------- 



Grey clod, ----------- 



Red rock with grey partings, ----- 



Poundstone with some red (red marly clay,) 

 Bassy coal (mush or impure coal,) - - - 

 Poundstone, ---------- 



Coal, --- ---------- 



Poundstone both tender and strong, - - 

 Hard white and brown rocks (sandstone,) - 

 Clumper beds, Rattlers (concretions), red 

 and white cold, --__-.- 

 Mush, or impure, coal, ------- 



Limestone of similar structure, and contain- 

 ing the same organic remains as that of 

 Pontesbury, _________ 



Reds, ------------ 



Blue clods and roof of coals with plants, 



Coal, --__- 



Poundstone, ---------- 2 



" Beneath this lies a whitish sandstone rock with brown stripes and 

 other measures overlying the only bed of good coal, which is worked 

 at a depth of thirty-five yards below the limestone. 



" In the work, at Uffington an effort was lately made to find the lowest 

 of the two coals, which in so many parts of this district occur below 

 the limestone ; but Uke the upper coal it proved to have thinned out 

 and disappeared, for at a few yards beneath the coal, the trial shaft 

 reached the purple schistose greywacke (Cambrian) inclined in nearly a 

 vertical position. A slight acquaintance with the mineral structure of this 

 part of the country would at once have checked the further prosecution of 

 a work which had reached the lowest rock, the fragments thrown up at the 

 mouth of this shaft being identical in structure with the adjacent rock of 

 Haughmond hill; but notwithstanding such palpable evidence, the speculator 

 continued to sink for fifty additional yards in these ancient beds, and 



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