10 



QEOLOOY OF TTTR AVON BASfN. 



Somewhat west of the Charlton brook, LeJs of a vci-y 

 different character make their appearance. N. of the Lower 

 Limestone Shales, near Naish House, we find, instead of 

 Old Red Sandstone, Coal Measures. Farther W". the Coal 

 Measures seem to bo in contact with Mountain Limestone ; 

 the band of Lower Limestone Shales ending off as shown 

 (HI the map. 



The nature of the Coal Measures (the dip of which varies 

 both in direction and angle, though the general tendency is 

 W.N'.W.) will be gathered from the following section from 



g near Coui't Farm : — 









Soil and Now Ue.il Sandstone . . .10 foot 



Dolomitio Conglomerate 







11 „ 



Pennant .... 







114 ,, 



Bed of Marl, with Water 







1 „ 



Pennant .... 







20 „ 



Clay, with 10 inches of Coal . 







<i ., 



Shales 







(iO „ 



Pennant .... 







2'20 ,, 



Shales 







5 ., 



Pennant . . . , 







63 „ 



510 „ 



Anstie (Coal Fields of OloucestersJdre and Somersetshire, p. 5.")), 

 from whom I quote this section, remarks : " This shows a 

 thickness of Pcrmant Grit nearly if not quite as great as 

 that at Nailsoa, and hence it is possible that the lower coals 

 may be at no great depth below." 



Finally, the rounded bosses on the slope of the Clapton 

 district disclose themselves on examination to be Moimtain 

 Limestone, of which oni- survey memoir says : " Around 

 Clapton-in-Gordano are several patches of (Jarboniferous 

 Limestone occurring in the midst of the Coal Measures, 

 positions which it scenm difficult to account for" (p. 21). 



