The Ordovician Lavas of Mynydd Prescclly. 31 3' 







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Fig. 1. — Soda-rhyolite, Qucarry, Goetty Mountain, Rosebush. x 18. 

 Fig. 2.— Soda-rhyolite, 500 yards W.N.W. of New Inn, Greenway, W. of 



Rosebush, x 22 



