44 



from the presence of Iron all along its course, and the disturbed 

 nature of the surface, reversed dips, &c., it is evident that 

 productive places may be determined along its bearing. 



W 



Yate Conmioo. 



Fig. 7. — Section shewing the three faults. May's Hill, Ram Hill, and Frampton, with the plan of the 

 Upper Coal Series, Pennant, Lower Coal Series, MiUstone Grit, Carboniferous Limestone, and 

 Old Ked, covered by the New Ked Sandstone and Lias on the west. 



I have before stated that I beUeve these faults were filled 

 during the period of the denudation of the Palaeozoic series, 

 when undergoing deep depression, and the consequent deposition 

 and accumulation of the Permian and New Red Sandstone and 

 Marls upon them; and again much modified, influenced and 

 added to at the subsequent destruction and re-denudation of the 

 New Red and higher Secondary rocks, consequent upon their 

 re-elevation to the present land area, all these non-conformable 

 series above the Old Red Sandstone, Carboniferous Limestone, 

 and Coal Measures from Tortworth, at the northern apex of 

 the basin to the Mendips on the south, having been swept 

 away; and wherever in the Bristol area, whether in the Carbon- 

 iferous Limestone, Millstone Grit, or Pennant, lodes and fissures 

 are filled with these hydrated peroxides, I beheve the age of that 

 infilling to be due to the changes which took place during the long 

 period of time that must have elapsed in modifying and recon- 

 structing the physical conditions of the area we are describing. 



It cannot be doubted but that the percolation of water 

 through porous rocks highly charged with the Oxides of Iron, as 

 is the case with the New Red series* and Pennant, and then 

 deposited almost in the form of Scinter or Tufa, has also been a 

 mode of accumulation in these fissures and joints, and is a 

 process now going on in the Pennant, wherever the influences of 



* See Analysis page 40. 



