1867.] 



TIMINS MALVEEN HILLS. 



361 





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i 



i 



13 



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X o 





,1 



§1 



s i 

 3S 





m 



<j 



Ow 



OQ 



p 



f^ 



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XLVII. 



62-01 



15-79 



9-37 



0-37 



1-19 



1-79 



4-26 



5-22 



XLVIII. 



65-60 



19-17 



5-11 



0-20 



1-86 



1-68 



3-64 



2-74 



XLIX. 



64-23 



16-70 



5-53 





2-07 



1-03 



3-41 



703 



L. 



75-07 



12-92 



4-26 



0-25 



214 



102 



1-90 



2-44 



XLYII. Shale from the east side of the lane between the Here- 

 fordshire Beacon and the oifstanding hill overlooking Little Malvern, 

 near the east base of the large buttress. G=2-690. 



XLYIII. Black shale from the low ridge east of the Hereford- 

 shire Beacon, near the keeper's lodge. The Black Shales of this 

 district are distinguished from the Black Shales near the Hollybush 

 Sandstone by their higher specific gravity, caused by a larger propor- 

 tion of metallic oxides and alkaline earths. G = 2- 644— 2-649. 



XLIX. Altered shale near the top of the narrow ridge forming a 

 slight curve over the keeper's lodge. G = 2*632— 2-658. 



L. Felstone, near XLIX. G=2-643. 



The result of the above analyses leaves no reason to doubt that the 

 metamorphic rock XLIX. has been formed by the alteration of a 

 shale similar to those in its vicinity. If the felstone (L.) had a 

 similar origin, its silicifieation must have been caused, not by the 

 direct action of an eruptive rock, but through a chemical change 

 produced by mineral waters, introducing silica and removing a por- 

 tion of the alkali. 



V. Felstones North of the Herefordshire Beacon. 



Highly metamorphosed sandstones, frequently with alternating 

 beds of shale, and occasionally associated with conglomerates, occur 

 at intervals, from the Camp Hill to the End Hill ; of these I propose 

 to consider the composition, probable age, and correlation to other 

 rocks, in a future communication. 



Felstones of a somewhat similar character to those of the Here- 

 fordshire Beacon are found, sometimes in rather large masses, east 

 of "Wind's Point. And in the large quarry west of the Wych Hill, I 

 found some rock of nearly the same composition, of the colour of 

 fine white brick, regularly bedded with a dark-greenish rock, like 

 the bedded traps of the Herefordshire Beacon, passing into the meta- 

 morphic diorite. 







. 



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d 



1 



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oi 



2 



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LI. 

 LIT. 



74-58 

 75-34 



13-52 

 13-09 



1-78 

 1-69 



2-16 

 1-53 





0-92 

 3-16 



7-04 

 5-19 





Lin. 



49-23 



20-74 



11-66 



12-07 



2-38 



2-58 



1-34 



LI. Pink felstone, forming tabular beds, east of Wind's Point. 



