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GEOLOGICAL NOTES ON GREAT AYTON. 
J. J. BURTON, F.GS. 
(PLATE XVIII.).- 
Ir is seldom the members of the Yorkshire Naturalists’ Union 
have the opportunity of examining such a varied and interest- 
ing series of rocks and phenomena within a radius of about 
Photo by) (Godfrey Bingley. 
Landslip at Roseberry Topping. 
two miles as was afforded them on the occasion of their visit 
to this district. 
The Great Cleveland Whin Dyke claimed most of their 
attention on one of the days. Arrangements had been made 
for those so inclined to inspect the workings of the Gribdale 
Mining Company, and many of the party availed themselves 
of the opportunity. The Dyke at this point is usually about 
eighty to ninety feet in width, but varies considerably. 
Naturalist, 
