188 



IGNEOUS ROCKS, 



"Upper 

 Gallery. 



Wall-case 4 



44. — Felspatiiic Conglomerate. — Moel-y-Golfa, Breid- 

 den Hill, Montgomeryshire. Map 60, N.E. GreenisWrey 

 felspatiiic sediment, with rounded fragments of felspatiiic 

 porphyritic rocks, and crystals of glassy felspar. 



This specimen very much resembles the ashy rocks 

 (No. 63) of Harrington Dingle, near Chirbury (Map 60 

 S.E.), and is probably a continuation of one of the Marrin^- 

 ton beds, repeated in a synclinal curve of Llandeilo flags 

 underneath the Upper Silurian rocks of the Long Mountain. 



45. — Ashy breccia, and conglomerate. — Breidden 

 Hills, Montgomeryshire. Map 60, N.E. Large, angular 

 and rounded fragments of porphyritic and other rocks in 

 an argillaceous and highly calcareous cement. Gives out a 



strong argillaceous odour. 



Some of the imbedded fragments appear to have been 

 well rounded and water-worn on the sea shore. They 

 have been found crusted with Silurian corals. 



46. — Felspatiiic and fumiceous breccia. — Breidden 



Hill, Montgomeryshire. 



N 



Dark blackisb- 



grey, with white angular felspatiiic fragments and pumi- 



ceous fragments included. 



Odour slightly argillaceous. 



Ashy Series of the Llandeilo flags between the 

 Stiper Stones and Chirbury, Shropshire, and of 

 Montgomeryshire. Maps 60, N.E. and S.E., and 

 Horizontal Sections, Sheets, No. 32, 34, and 36. 



47. — Felspathic and talcose ash. — Disgwylfa Hill, 3 

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

 Greenish-grey slaty rock, with talcose matter and calcareous 

 particles, giving it an amygdaloidal appearance. 



48. — Compact sandy felspatiiic ash. — Disgwylfa 

 Hill, near Bishops Castle, Shropshire. Dark greenish- 

 grey felspathic sediment, close-grained, with a few broken 

 crystals and grains of silica. 





,*** w 



Some of the felspathic fragments in this locality appear iir-Fn 

 as if they had been ejected in the form of pumice stone. fe; 



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Xort 



toft 



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