RADSTOCK SERIES OF THE SOMERSET AND BRISTOL COAL FIELD. 33< 



Radstock great overlap fault, are well worthy of detailed study, but they do 

 not fall in with the scope and object of these remarks. 



Having now taken a general survey of the ground, let us return again to 

 the Upper Division of the Coal Measures, which embraces the Radstock and 

 Farrington Series. 



The Radstock and Farrington Series occupy a basin, extending from Brisling- 

 ton in the north to Kilmersdon in the south, and form an oval tract whose 

 length from north to south is about 12 miles, and whose width from east to 

 west is about 5 miles. 



There is another and smaller basin referable to the Radstock and Farring- 

 ton Series, more particularly to the latter, which extends northwards from 

 Pucklechurch for about 4 miles, with a width of about 2 miles. 



From this portion I have not collected, nor have I seen many specimens 

 from it, but this is most probably due to deficient collecting, and not to 

 the absence of specimens. 



I may mention here that the Radstock and Farrington Series, when viewed 

 in their relation to the other coal fields of Great Britain, belong to their upper- 

 most portion, and are the true Upper Coal Measures, altogether independently 

 of their local position. 



The coal of the Upper or Radstock Series is chiefly worked in the neighbour- 

 hood of Radstock, Writhlington, Midsomer-Norton, Camerton, Timsbury, and 

 Paulton, and it is from the pits in the neighbourhood of these villages that 

 most of the fossils referred to in this paper have been derived. 



The Radstock or Upper Series of the Upper Division contains eight veins, 



viz. : — 



The Withy Mills Seam, . . . . . . 1 ft. 4 in. 



Great Vein, . 

 Top Little Vein, . 

 Middle Vein, . 

 Slyving Vein, 

 Under Little Vein, 

 Bull Vein, . 

 Nine-inch Vein, 



Total, 



The total thickness of these veins is considerable, but in no case is the 

 whole of it available at any one place. 



In the majority of cases I have found it impossible to note the vein from 

 which the various fossils came, but the whole of the Radstock Series are so 

 intimately connected that the knowledge of the actual veins from which the 

 fossils originate appears to be of little importance in the present instance. 



The pits at which I have collected most are : — Braysdown Colliery, near 



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