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BY E. B. TAWNEY, Assoc. R. Sch. Mines. 



Head hefore the Geological Section, February^ 1878. 



HAVING thought that it might interest the Society, I 

 propose to give some account of Dr. Hicks' researches 

 among the Older Rocks at St. Davids, and exhibit, at the same 

 time, specimens which I collected there in the past summer. 

 Oar remarks will not unnaturally perhaps take the form of a 

 commentary on his last essay* read before the Geological Society 

 in November, 1876, in which is brought before us an account of 

 the oldest rocks in England and Wales, and new arguments 

 entailing new appellations to characterise their relative antiquities. 

 We are there introduced to the Dimetian and Pebidian series, which 

 are far older than, — being unconformable to the oldest fossiliferous 

 series, — the lowest Cambrian. To these our observations will be 

 chiefly contined, for they are the latest acquisitions to science in 

 that area. Not that Dr. Hicks' researches have been confined to 

 them, — they are newest because they have been taken last. 



* On the Pre-Cambiian {Dimetian and Pebidian) Rocks of St. David's, by 

 Henry Hicks, M.D. O. J. G. S. xxxiii., p. 229, [1877,] 



