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VOLCANIC ASnES, ETC., SHROPSHIRE. 



189 



49.— Fine felspathic tufa — Disgwylfa, near Bishops 

 Castle. Map 60, S.E. Soft brownish-grey felspathic and 

 argillaceous sediment, with yellow-brown patches of decom- 

 posing felspar crystals ; outer surface very earthy. 



50.— Felspathic ash.— Disgwylfa Hill, near Bishops 

 Castle, Shropshire. Felspathic rock, very compact, made 

 of very fine sediment, marked by lines of concentric 

 weathering. 



This rock is composed of exceedingly fine consolidated 

 felspathic volcanic dust. 



51. — Very compact felspathic ash Yr Ynys, 4 miles 



north of Bishops Castle, Shropshire. Map 60, S.E. A 

 slightly porphyritic greenish-grey compact rock, with 

 specks and films of black slaty matter, and a few scattered 

 crystals of felspar, very calcareous ; weathers light brown. 



Upper 

 Galleet. 



Wall-case 4. 



52. — Volcanic sediment. 



Pitchels, 2\ miles north of 



Bishops Castle. Brownish-black compact sandy rock, with 

 small fragments and crystals of felspar ; weathered surface 

 very slightly changed to a light brown crust. 



The rocks from 47 to 52 lie in bedded lines very near 

 the base of the Llandeilo flags west of the Stiper Stones. 



53. 



felsp 



fcc, Hyssington, near Bishops Castle, Shropshire. Map 60, 

 S.E. Dark greenish-grey granular felspathic rock, with 

 crystals of felspar and strings of calc spar. This is from 

 beds of ashes equivalent to 51 and 52, near the base of the 

 Llandeilo flags. 



54.— Porphyritic felsphatic ash.— Brook House, 5 

 miles North of Bishops Castle, Shropshire. Map 60, S.E. 

 Bark greenish-brown and black rock, with slaty particles 

 and crystals of felspar. Impressions of 



calcareous matter 



fossils 



weathers to a brownish-grey earth. 



From the same beds as 5 1 to 52. 

 55 — Felspathic breccia 



north of Bishops Castle, Shropshire. Map 



greenish-grey compact felspathic rock, with crystals of 



Heath Mynd, 3 miles 



Dark 



! 



