8 RECENT SECTIONS IN THE MALVERN HILLS. [Feb. 1 895, 



House rocks may be a part of the complex that has altogether 

 escaped metamorphism, that the Baggedstone Hill rocks are a part 

 in which metamorphism has been arrested at an early stage, while 

 the schists represent the final step in the process. 



The only other rock that need be mentioned here forms an iso- 

 lated boss south of Chace-end Hill, 30 chains north of Bromsberrow 

 Place. It is reddish and brecciated, and all one can say about it is 

 that it is a shattered felstone thickly impregnated with limonite. 

 There is nothing to show its relationship to the adjoining rocks. 



[I had forgotten to state that Mr. J. F. Bryant has made a study 

 of the Warren House rocks, and has kindly furnished me with a 

 oopy of Mr. Harker's notes on his slides, which the Author has 

 given me leave to quote. Mr. Harker says : — " The rhyolites are 

 just like many in North "Wales, and the ashes with rolled bits of 

 lava could be matched there, and especially in the Lake District." — 

 December, 1894.] 



Discussion. 



Mr. Watts asked whether the rocks were the same as those 

 described by Dr. Callaway. 



Dr. Hicks was glad that Mr. Watts had called attention to 

 Dr. Callaway's researches amongst these rocks. He had gone over 

 these sections some years since under Dr. Callaway's guidance, and 

 found that the rocks resembled in a marked manner the Pebidian 

 rocks of St. David's. 



Mr. B/cttley said that he agreed in almost every respect with 

 the Author's statements. The rocks occurring in this small area 

 were lavas of acid and basic characters, associated with tuffs. The 

 felsitic lavas sometimes contained epidote, at others calcite, the 

 latter mineral being often present in considerable quantity. The 

 structures in these lavas were exceedingly obscure. That these 

 volcanic rocks were totally distinct from the crystalline schists 

 which constitute the main mass of the Malvern range, there could, 

 he thought, be no doubt whatever ; and of the different hypotheses 

 alluded to by the Author, he was inclined to adopt that of the 

 volcanic rocks being of later age than the crystalline schists — a view 

 which led to the inference that the former had been let down 

 between faults. While admitting that various parts of the range 

 showed evidence of having been affected by pressure and earth- 

 movements, he did not agree with Dr. Callaway in considering that 

 the stresses had resulted in shearing, except on a very limited scale 

 in certain zones. 



Mr. Harker testified to the resemblance of the rocks from the 

 new reservoir at Malvern to the old acid lavas of Caernarvonshire. 

 He had had the opportunity of studying a series of rocks collected 

 from that locality by Mr. J. F. Bryant. The type is well characterized 

 by its containing only a few scattered porphyritic crystals of plagio- 

 clase (without quartz or any ferro-magnesian mineral) in a crypto- 

 crystalline groundmass. Among newer rocks this type is represented 

 by the rhyolites of Iceland. 



The Author replied. 



