The Ordovician Lavas of Mynydd Frescelly. 819 



Fig. 5.— Soda-trachyte, 500 yards S. of Pant-maenog, Eosebush. " x 18. 

 Fig. 6.— " Keratophyre " Crags, S. side of Foel Trigarn, 1 " "' "'" 



Arms. X 22. 



mile W. of'Crymmycb 



