GEOLOGY 



ice, and that the Macclesfield shells and sands and gravels were pushed 

 up from the Irish Sea by the glacier which filled it. 



Foreign erratics have been found by the writer at considerable 

 heights above sea level in various parts of the Mountain Limestone 

 district, the highest one at 1,370 feet. Miss Dale records the finding of 

 foreign erratics in the neighbourhood of Buxton, one at the height of 

 1,360 feet above sea level, and considers that the ice advanced over the 

 Col at Dove Holes, filled the valley of Buxton and flowed through the 

 valleys of the Wye and the Dove, and the Derwent below its junction 

 with the Wye into the Trent valley. A considerable amount of detailed 

 work will have to be done before our knowledge of the high level drifts 

 of the county is complete. It will probably be found that the glaciation 

 of the uplands was much more extensive than has been supposed. 

 Sufficient evidence has been already published to modify the theory 

 which was formulated by the officers of the Geological Survey some 

 years ago and founded on the evidence which had at that time been 

 obtained. 



APPENDIX 



Want of space prevents any attempt at a bibliography of the geology of the county. 

 Further details of some of the subjects which have been briefly dealt with in the preceding 

 pages will be found in the following memoirs and papers : 



Geol. Survey Memoir North Derbyshire. This contains a bibliography to the year 1887. 



STOKES, A. H. ' Lead and Lead Mining in Derbyshire,' Trans. Chesterfield and Derbyshire 

 Inst. Eng. (1880), viii. 60 et seq^. 



TEALL, J. J. H. British Petrography, pp. 209, 210 and plate ix. ; Igneous Rocks (1888). 



ARNOLD-BEMROSE, H. ' On the Microscopical Structure of the Carboniferous Dolerites and 

 Tuffs of Derbyshire,' Quart. Journ. Geol. Soc. (1894), 1. 603-44 (i plate). ' On a 

 Quartz Rock in the Carboniferous Limetones of Derbyshire,' Quart. Journ. Geol. Soc. 

 (1898), liv. 169-82. 'Geology of the Ashbourne and Buxton Branch of the London 

 and North- Western Railway (Ashbourne to Crakelow),' Quart. Journ. Geol. Soc. (1899), 

 Iv. 224-36 (2 plates). ' On a Sill and Faulted Inlier in Tideswell Dale,' Quart. 

 Journ. Geol. Soc. (1899), pp. 23949 (2 plates and sections). ' A Sketch of the Geology 

 of the Lower Carboniferous Rocks of Derbyshire, 1 Proc. Geol. Assoc. (August, 1899), 

 xvi. 165-221, pt. 4 (2 plates and sections). This sketch contains a brief bibliography 

 of some recent papers on the Mountain Limestone. 



GEIKIE, SIR ARCHIBALD. Ancient Volcanoes of Great Britain (1897), ii. 8-22. 



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