GEOLOGY OF THE BEISTOL COi.LFIELD. 



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character, and ferruginous, earthy, and a deep reddish brown. 

 In some places the ferric oxide is so abundant as to form 

 crystalline concretions. The following are two analyses — IS'o. 1, 

 of the Trap at Weston-super-Mare ; !Nos. 2 and 3 of that from 

 Broadfield Down. The last is an analysis made by the late Mr. 

 Herapath, and given by Charles Moore, Esq., F.G.S. 



These igneous rocks appear to have been forced through the 

 submarine strata at the close of the Ehoetic or the end of the 

 Triassic period. The former is the most probable, from the 

 physical conformation of the strata as now seen. At Uphill the 

 Ehoetic beds are in actual contact with the Trap, and are 

 completely turned over ; and as the other beds a short distance 

 off are not disturbed, it is evident that they must have been in a 

 soft state when the eruption occurred. It was this upheaval 

 that formed the Clifton chasm, and the Cheddar Yalley, with its 

 cliffs and caves. 



Mr. C. Moore, who has been working in this district for sD 

 many years, has discovered at the top of the Mendip range, the 

 Trap itself, having still the same basaltic character. He has 

 settled therefore the question of how these great ranges of hilly 

 country and the numerous faults were produced. 



