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MONTGOMERYSHIRE AND SHROPSHIRE, 



205 



only the beds on which the felspathic lavas 

 those above them being quite unchanged. 



lie are altered, Upper 



Gallekt. 



< 



Intrusive Rocks of Lower Silurian age, Breidden 

 Hills, and between the Stiper Stones and Chirbury. 

 Montgomeryshire and Shropshire, 



1 48.— Gbeenstone — Breidden Hills, Shropshire. Map 

 60, N.E. Black hornblende and white and greenish 

 felspar in small indistinct crystals ; contains some quantity 

 of calc spar. 



From a mass of greenstone intruded among Llandeilo flags 

 that underlie the volcanic ashes, Nos. 42 to 46. 



grey or greenish 



Mass 



149 . — Greenstone. — Cefn. 



Dark 



felspar, with small black hornblende crystals, 

 slightly calcareous, seams of calc spar traversing it in 

 places. 



From a small intrusive mass of greenstone by the turn- 

 pike road, 3 miles north-east of Welshpool, Montgomery- 

 shire. Map 60., N.E. 



150— Felspathic tkap.— Welshpool, Montgomeryshire. 

 Map 60, N.E. Compact felspathic rock, with a few fel- 

 spar crystals. 



This rock is columnar, and alters the Caracloc or Bala 

 beds among which it has been intruded. 



Greenstone— Simmond's Castle, near Bishops 

 Castle, Montgomeryshire. Map 60, S.E. Dark green 

 hornblendic rock, with a few indistinct felspar and black 

 hornblende crystals. 



From a line of greenstone 5£ miles in length, which has 

 been injected in branches into beds of volcanic ashes and 

 slaty rocks of the Llandeilo flags. 



152.— Greenstone— Cross Roads, 1 mile south-west of 



Hyssington, Montgomeryshire. Map 60, S.E. Dark com- 

 pact felspathic rock, with a few small hornblende crystals 

 and kernels of calc spar. 



151. 



Wall-case 4. 



