INTRODUCTION. 



XXV 



that clay, which is absent from the country south of Yorkshire and the north-east of 

 Lincolnshire. 



THE YORKSHIRE COAST SECTION FROM THE MOUTH OF THE HUMBER TO SPEETON (50 miles). 1 



Kilnsea Easington 



Beacon. Gap. Dimlington. Out Newton. Withernsea. Sand le Mere. 



Garton. 



a Kill/ 



Ringboro'. Talbot Inn. Mappleton Ravine. Hornsea. Skipsea. 



Beverley Ilart- 

 drain. burn. Auburn. 



esa-H*! 



Bridlington 

 Harbour. Sewerby. Danes Dyke. South Sea. North Sea. 



I 



Hunmanby 

 Speeton and Bucton Cliff's. Speeton Hill. (inland). 



rp£. 



c' c' 



^S0±Z 



u 



c ci ci 



Intersection of the Wold escarpment by the Coast line. 



Vertical scale, 500 feet to the inch. Horizontal scale of the part between Kilnsea and Bridlington, 2\ 

 miles to the inch ; of the part between Bridlington and the break in the section, 2 miles to the inch ; and of 

 the Wold intersection, 2 inches to the mile. 1. Oolitic formations. 2. The Red Chalk. 3. The Chalk, a. Blue 

 clay, principally composed of Oolitic and chalk debris (No. 9 of the Norfolk and Suffolk map and sections). 

 b. Occasional thin beds of sand and gravel, and bands of clay intermediate between a and c. c. The purple 

 clay with chalk debris in its lower part. This clay occurs as far south as Cleethorpes in Lincolnshire 

 (where it is capped by e), but it then becomes lost under the great marsh of East Lincolnshire.*/ Sand and 

 gravel beds in c, from one of which at the beach line immediately north of Bridlington Harbour the 

 Bridlington shells referred to in the ' Crag Mollusca ' and its ' Supplement ' have been obtained, c. Moraines 

 of rolled chalk lumps under c, which are probably terrestrial equivalents of the lowest portion of the 

 Marine Glacial Clay, c, in the southern part of the section, d. The Hessle sand and gravel (Kelsea Hill 

 Gravel), e. The Hessle clay with boulders, f. Sands and gravels posterior to e, and which at Hornsea 

 contain fresh-water mollusca. f. Still later gravel, principally composed of chalk fragments. The recent 

 Cyclas marls omitted. The asterisk marks an interval omitted of four miles, f marks the source of the 

 Hertford river, which, rising near the cliff, flows away from it inland. The lowest part of c, or that with 

 the chalk debris in greatest abundance, dies out some way south of Bridlington, near which, its place becomes 

 occupied by the chalk moraines, c. 



Along the South Yorkshire coast the unstratified chalky clay (No. 9) of East Anglia 

 occurs in the lower part of the cliff, beneath which, judging from adjacent borings inland, 

 it descends near the Humber end, about 100 feet, being in some of the borings underlain 



1 Taken from a paper by S. V. Wood, jun., and J. L. Rome on the "Glacial and Post-glacial structure 

 of South Yorkshire and North Lincolnshire" in ' Quart. Journ. Geol. Soc.,' vol. xxiv, p. 146. The cut is 

 reproduced here by the kind permission of the Council of the Geological Society. 

 e 



