GEOLOGY OP THE BRISTOL COAL-FIELD. 331 



commencement of the Millstone Grit or farewell rock, the first bed 

 of which may be seen behind the General Draper Inn. These beds 

 are highly charged with Hematite. In some places the Ferric oxide 

 is found as an amorphous deposit, containing from 40 to 50 per cent. 

 of metallic iron. It is however, much mixed with silica, which 

 consequently detracts from its value. 



Perhaps a fair average of metallic iron would be about 30 per 

 cent. Analyses of these Hematite ores from Clifton, Ashton, 

 and "Winford, chosen from the ordinary earthy samples, gave the 

 following results. — 



MetaUicIron ... 52.63 ... 50.40 ... 58.9 

 On the surfaces of some of the upper beds of siliceous limestone^ 

 or else enclosed in some of the larger crystals of quartz, are 

 beautiful bright crystals of Hydrated Ferric Oxide (Gothite). On 

 the beds near the southern buttress of the Suspension Bridge, are 

 good specimens of Carbonate of Iron. 



Good localities for collecting Carboniferous fossils are Cheddar » 

 Portishead, Henbury, Weston, Clevedon, and many parts of the 

 Mendip Hills. 



The following is a list of the principal fossils that have been 

 noticed ia the Carboniferous rocks of the district. — 

 FeH cites dichotoma Textularia eximia (D'Eich-wold) 



Knorria Climacammina antiqua (Brady) 



Trochammina centrifuga (Brady) Stacheia pupoides (Brady) 

 incerta (D'Orb) Lituola Binnicana (Brady) 



Archse discus Karreri (Brady) Nodosinella concinna (Brady) 



