at Dinas Read, North CormcaU. 



17 



thus described by Mr. Teall : " A coarsely crystalline aggregate, 

 mainly composed of a carbonate which does not effervesce with cold 

 acid. Probably a dolomite." 



vv^v;. jrrtrr 



Sddd.'f'oc^ 



Fig. 2. Sketch of junction of greenstone and soda rock on Southern ClifE of Dinas 

 Head, showing that the greenstone cuts across and disturbs the beds of the 

 soda rock. 



Further up the cliff the soda rock and slate are interbedded, both 

 showing rusty-coloured lamination. The strata between these faults 

 are much twisted and disordered. In one place a dark cherty band 



£)//V/lS H£/\0 



iG. 3. Sketch of section on "Western Cliii of Dinas Head, showing — 



"«" Dark cherty slate with concretions and lenticles of dolomite. The 



concretions with occasional concentric structure. 

 " 6 " Dolomitic hand about 4 feet thick interbedded with slate. 

 " c " Thrust-plane with a dtlomitic fault breccia lying in cakes about it. 



is seen to make a loop several feet long, enclosing calcareous rock.^ 

 Blue limestone bands are also interbedded with the slates in this 

 district. 



1 We find similar bands of dark chert, rolled with dark calcareous rock, at 

 Cataclews Point, 1^ miles east of Dinas Head. 



DECADE IT. VOL. II. NO. I. 2 



