206 



INTRUSIVE IGNEOUS ROCKS. 



Upper 

 Galleey. 



Wall-case 4. 



153. — Greenstone. — Corndon, 3 miles south-east of 

 Chirbury, Montgomeryshire. Map 60, S.E. Green horn- 

 blendic base, with light greenish felspar crystals. 



An intrusive boss of greenstone, forming a bold round 

 hill in theLlandeilo flag region, north of Bishop's Castle. 



— Cefn Gwynnlle, near 



154. — Greenstone porphyry. 



Bishops Castle, Shropshire. Map 60, S.E. White im- 

 perfect felspar crystals and kernels of calc spar in a light 

 green matrix ; also some strings of calc spar. 



A very felspathic greenstone running in a narrow line 

 along the strike of the Llandeilo flags, into which it has 

 been injected between the lines of bedding. 



155. — Greenstone amygdaloid. — Lower Ridge, 2 miles 

 east of Chirbury, Shropshire. Map 60, S.E. Dark grey 

 felspar and small black hornblende crystals, with a few 

 large kernels of calc spar ; the mass of the rock slightly cal- 



careous. 



No 



156.— Greenstone.— South-east of Eadley, and 2 miles 

 east of Churchstoke, near Chirbury, Shropshire. Map 60, 



S.E. White 

 Mass 



and black hornblende. 



From a small boss of intrusive greenstone in the Llan- 



deilo flags. 

 157. 



Greenstone amygdaloid. — Todlethr, Church 

 Stoke, Montgomeryshire. Map 60, S.E. Greenish -grey 

 felspathic rock, with cavities filled with small spheroids of 

 calc spar, coloured externally with protosilicate of iron. 

 From the south end of the same mass as No. 151. 



Sertes of Intrusive Rocks from the Llandeilo flags, 



Radnorshire, near Builth. 



158. 



Greenstone amygdaloid. 



north-west of Builth, Brecon. 



Well field, 1 



i 



mile 



Map 56, S.W. Fine- 



grained green rock, with small white crystals of felspar 

 and many cavities filled with calc spar ; some of the outer 



r 



fi 



J 



i 1 



lUi 



:■ 



|ca: 









::. 



;an 



V I 



ilSS 



> ' 



: 



kbrc 



From 



' ; w 







k 





F 



•^ 



>; 



<i 



or 



