202 



INTRUSIVE IGNEOUS ROCKS. 



qSSer finely £ ranular mixture of quartz and felspar crystals, with 

 — ' a few small hornblende crystals interspersed, 

 a -case 4. p art f an intrusive mass 3 miles long, forming the hills 



of Bwlch-mawr, Y Gyrn-Goch, Y Gyrn-ddu, and Mod 

 Penllechog. 



130. 



Felspathic trap. — My 



miles south-west of Pwllheli, Caernarvonshire. Green fel- 

 spathic base, with a few hornblende and white felspar 

 crystals dispersed through it. 



From the same mass as No. 127. 



131. — Felspathic porphyry. — Carn Neddol, 5 miles 

 west- south-west of Pwllheli. Dark grey felspathic base, 

 including white felspar crystals, and a little hornblende 

 often decomposed. 



From the same mass as 127 and 130. 



132. — Felspathic greenstone. — Yr Eifl or the Rivals, 



Caernarvonshire. Map 



Grey and white crys- 



tallized felspar, with small hornblende crystals diffused 



through the mass. 



133. 



Felspathic greenstone. 



Pink felspar with 



crystals of white felspar and hornblende. More horn- 

 blende than in No. 132. 



From the same locality as No. 132. 



134. — Greenstone. — Penmaen-mawr, between Conway 

 and Bangor, Caernarvonshire. Map 78, S.E. Intimate mix- 

 ture of felspar and hornblende, the felspar predominating. 



135. 



Greenstone. 



41 miles south-west of Clynog 



Fawr, Caernarvonshire. Map 75, N.W. Finely granular 

 mixture of pink and transparent white felspar crystals, 

 and small crystalline particles of hornblende. 

 From the same rock as 120. 



136 — Felspathic Greenstone. — Pen ar-fynydd, 3 miles 

 east of Aberdaron, Caernarvonshire. Map 76, S. Greenish- 

 grey felspar base (somewhat decomposed), with black horn- 

 blende and white felspar crystals. Largely crystalline 

 structure. 



From the same mass as No. 128. 



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