•342 TWO DEEP BOEINGS AT CALVERT STATION. [Julie I9I3, 



measurement of the general direction of dip which, if of no imme- 

 ■diate use, might he of value in connexion with future observations 

 of a similar nature. Dip-observations taken in a stratum several 

 'hundred feet thick would surely escape some of the worst effects 

 of mere local dip and folding. 



He also suggested some regularly organized system of keeping 

 motes of, at least, all special or deep boreholes, urging the need 

 ■for educating the workmen in the importance of accuracy. 



The President (Dr. A. Strahan) said that he had watched this 

 ! boring, almost from its commencement, with great interest. He 

 ireminded the Fellows that a report that coal had been found in it 

 ihad been widely circulated ; but that the discovery of Clonograptus 

 in the supposed Coal Measures had led to a reconsideration of the 

 evidence on which the report was founded. It was most satis- 

 factory that, by combining the information obtained by Dr. Davies 

 ■with that obtained by Mr. Pringle, acting for the Geological Survey, 

 -a reliable account of the strata had been produced. 



The question of registration of boreholes, mentioned by a 

 previous speaker, was one to which he hoped to call attention 

 •shortly. The recommendation made by the Royal Commission on 

 Coal-Supplies had so far led to no practical result. 



Mr. J. Pringle said that the conspicuously green clay which 

 occurred in the Forest Marble at Blackthorn Hill had proved 

 ■recognizable in the Calvert Boring, and had served as a trust- 

 worthy index. He had to thank Mr. Barrow for calling his atten- 

 tion to its importance. He also thanked the Fellows for the cordial 

 ■reception which they had given to the paper. 



Dr. A. M. Davies, in reply, said that Mr. Bnckman's contri- 

 bution was of the greatest importance, and might ]ead to modifi- 

 cations of view as to the tectonic structure. He replied to Dr. Matley 

 that he had considered the possibility of some of the structures 

 -shown by the oolitic rocks being due to contemporaneous erosion 

 rather than to derivation from older rocks, and had decided that 

 this could not be so in all cases, though it might in some. To 

 T\ir. Booth he replied that Mr. Hiorns had endeavoured to ascertain 

 the direction of dip ; but the preliminary experiments carried out 

 in order to determine the possible deviation of the borehole had 

 been unsuccessful. He considered that the time had not yet come 

 for attempting to make a geological map of the Palaeozoic floor. 



