284 
secretary's report. 
described the condition and distribution of the drift of East 
Yorkshire, and pointed out that it contained a remarkable assem- 
blage of rocks in the form of boulders. An attempt to tabulate 
the larger boulders of the drift, those abo^ e one foot in diameter, 
had been made by the Hull Geological Society, with interesting 
results. It was found the local rocks of the coast almost alwaj^s 
had travelled south, and the same was true of the Teesdale 
group of travelled boulders. In these cases it was found, taking 
only the larger boulders into consideration, that these south - 
travelling boulders decreased rapidly in numbers in passing from 
the Saltburn to the Dimlington sections. On the contrary, the 
Norwegian boulders increase d in numbers as the drift was traced 
southwards, and the same was true of the numerous granites, most 
of which have not been identified. Mr. Stather argued that 
the source was indicated by the dispersion of these boulders, 
and drew the conclusion that there was a community of origin 
between these granites and the known Norwegian rocks, and 
that they had come over the North Sea. 
Mr. Percy F. Kendall, F.G.S., gave an interesting address 
on the chief facts noted during the excursion. The general 
structure of the Cheviots was a floor of denuded Silurian rocks, 
which had been covered by a great out How of lavas in the Old 
Red Sandstone period. These lavas, after the cessation of 
volcanic action, had been invaded and pushed up by a great 
dome of granite, which had considerably altered the beds with 
which it had come into contact. Then these beds had been sub- 
jected to severe denudation in the Carboniferous sea, and great con- 
glomerates had been formed. A period of quiescence had followed 
covering most of the Secondar}^ period. In the Tertiary period 
another great volcanic outburst had taken place, producing exten- 
sive changes along the broad valley which then extended between 
the mainland of Scotland and the outer Hebrides. This outburst 
starred the rocks for long distances, and the cracks produced 
were filled by basaltic rocks. The glacial period would produce 
small local glaciers in the valleys radiating from Cheviot, but 
this district was invaded by the great ice-sheet which filled the 
