284 



llEPORTS ON THE STATE OF SCIENCE. 



No. :i7lA. 

 Anff. 16 JV.E. 



K.,0 , 

 Na„0 



Sid, . 



Greenish Miea Sukid. 



Cromlech Farm, Rhoscohjn. 



I. 

 . 4-44 

 . 24G 

 . 53-33 



11. 



4-37 



2-GO 



5401 



This is a mica schist from Rhoscolyn, Holyhead Island. ] t has been 

 selected, although from a different district, for comparison's sake, for 

 there can he no doubt in this case that we are dealing with sedimentary 

 material. 



No. 1 24a. Muscovite Epidote Schist. 



Aw/. 1 9 iY. ir. ; 200 feet N.W. ' \ G9.' IF. of nen-dimqnlie. 



I. II. 



SiC, . 

 Al.,6., 

 FcOa 

 Feb. . 

 CaO . 

 M^O . 



K.!d . 

 nLo . 

 ii,.6 . 



99-78 



9980 



This is a mica schist from near Penmynydd, in the south-eastern dis- 

 trict, and belongs to a series which in one place appear to pass into 

 felsite, in others into sediments. It was selected to complete a group of 

 analyses of which the rest were very kindly made for me some years ago 

 by Mr. Edmund Dickson, F.G.S. 



A limestone from Rhydeilian, about a mile from No. 124a and in the 

 zone of passage between those rocks and the schists in which sedimentary 

 material can still be recognised. 



No. 99a. Flaky Micaceous Gneiss. 

 Aiiff. 18 S.E. Edge of Wood at trail corner, 200 feet N. W. Oraig Fach. 



SiO 



Alp, 



rc„o,, 



A gneiss containing sillimanite from Holland Arms. It occurs at 

 the junction of the mica schists with the hornblende gneisses of that 

 locality. 



