Vol. XXVII. 

 igio 



] Armitage, Country about West Ussendon. ^y 



felspar, and tiny portions of glass. The cementing material 

 was originally oxides of iron, but this has been invaded and 

 reinforced by a siliceous infiltration which borders many of the 

 quartz grains to a slight extent with quartz in optical con- 

 tinuity, and from the borders fades away gradually into a fine, 

 independent, interstitial, chalcedonic silica, which is mixed with 

 the iron oxide. The character of the sand grains in the quartzite 

 indicates that they are undoubtedly derived from some such 

 rock as a granodiorite or a granite. The character of the siliceous 

 cement, and the fact that many of the sand grains are quite 

 angular, point to the conclusion that the deposition of the silica 

 was rapidly effected. 



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