384 MR. G. "VV. LAMPLTJGH ON THE 



23. On the Drifts of Flamrorotjgh Head. By G. \V. Lamplugh, 

 Esq., P.G.S. (Read March 25, 1891 .) 



[Plate XIII.] 



Contents. 



Page 



I. Introduction 384 



II. Physical Features of the Area 386 



III. .General Distribution of the Drift 389 



IV. Description of the Sections 390 



(a) Bridlington Quay. 



(b) Potter Hill. 



(c) Sewerby. 



(d) The Buried Cliff. 



(e) Sewerby to Danes' Dyke. 

 (/) Danes' Dyke. 



(<7) Hartindale Gutter. 



(h) Beacon Hill. 



(i) South Sea Landing. 



(k) South Sea Landing to High Stacks. 



{I) High Stacks. 



(m) Pigeon Hole. 



(n) Selwicks. 



(o) Stottle Bank to North Sea Landing. 



(p) The Thornwicks. 



(q) Sanwiek. 



(r) Bempton and Buckton. 



(s) Speeton. 



(t) Filey Bay, &c. 



(ji) Inland Sections. 



V. Boulders 408 



VL Classification of the Drifts 410 



1. "Infra-glacial" Beds. 



2. The Chalky Rubble. 



3. The Basement Boulder-clay. 



4. The Intermediate Series and Purple Boulder-clay. 



5. The Upper Boulder-clay. 



6. The Sewerby Gravels and Newer Beds. 



VII. Notes on the Correlation of the Drifts 425 



VIII. Conclusion 428 



IX. Summary 429 



I. Introdtjction^. 



The object of this paper is to describe the glacial deposits which 

 overlie the Chalk on Flamborough Head, and to show their relation 

 to those of the neighbouring areas north and south of the headland. 

 Though a considerable amount of scattered information respecting 

 these beds has already been published *, no systematic or detailed 

 account of the drifts as a whole has yet been carried out. 



The district is one of peculiar importance for students of the 

 glacial phenomena of our East coast, since it is at this point that 

 the connexion between the drift of the hills and that of the plains 



■* A good bibliographical list up to the year 1885 will be found in the 

 Geological-Survey Memoir on Holderness (by Mr. Clement Eeid), pp. 163- 

 170. 



