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CAERNARVONSHIRE, AND ANGLESEA. 



115 



rently intruded amid the green quartzose and chloritic Upper 



schists, which are much contorted on a small scale." Sir Ga ^ ey * 



Henry De la Beche. See similar jaspar from Aberdaron, Wall " case45 

 Caernarvonshire, on top shelf. 115 to 117 are from a 

 series of metamorphic schistose and gneissic rock, which 

 stretch along the south side of Caernarvon Bay from Porth 

 Nevin to Barsey Island. They are associated with serpen- 

 tine and crystalline metamorphic limestone, containing 

 much silica. 



Metamorphic rocks of Angles ea. 



118. — Micaceous slate, foliated. Metamorph 

 brian rock. — Bodwrog, Anglesea. Map 78 N 



f quartz with 



Cam- 



Close to a mass 



of granite 10 miles in length, which extends from near 

 Llanerchymedd to the sea near Llanfaelog. 



H9.— Chloritic slate. Tregaian, Anglesea. Map 78 



Chloritic matter with lenticular layers of quartz. 

 Foliated metamorphic Cambrian rock. 



W 



120. 



foliated and 



Llaneilian, near Amlwch, Anglesea. Map 78 N.W. Meta- 

 morphic Cambrian. Part of a series of foliated rocks that 

 form great part of the north of Anglesea. Probably most 

 of them are of Cambrian date ; but the whole are so meta- 

 morphosed that some of the strata may be altered Lower 

 Silurian. 



121 — Gneiss. 



N 



Map 78 N.W. Metamorphic Lower Silurian rock, composed 



foliated 



From a 



small tract of Silurian slaty rock, lying in the midst of the 



granite. 



122. — Serpentine. 

 78 N.W. Mottle 



Map 



fi 



Llanfechell, Anglesea. 

 From a mass included 



123. Green serpentine, Ceryg-moelion, Holyhead Is- 

 land, Anglesea. Map 78 N.W. From one of three masses of 





