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).! 
Kilnsea Easington 
Beacon, Gap. Dimlington. Out Newton. Withernsea. Sand le Mere. Hilston. Garton. 
i 
H H 
1 t 
4 
t t 
1 
1 1 
’ 
Beverley Hart- 
Ringboro’. Talbot Inn. Mappleton Ravine. Hornsea. Skipsea. drain. burn. Auburn. 
[az Tl << (ircorrannen te ee Lil FU LUT EL ML AE DHL TN eT NTE LEE eS 
a7 ec c 
Hunmanby 
Speeton and Bucton Cliffs. Speeton Hill. (inland). 
Bridlington ivi 
Harbour. Sewerby. Danes Dyke. South Sea. North Sea. 
* 
i 
H 
t 
' 
H 
H 
i 
( 
i 
| 
Cc 
S 
7 
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, 23 
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 débris (No. 9 of the Norfolk and Suffolk map and sections). 
b. Occasional thin beds of sand and gravel, and bands of clay intermediate between aandc. ce. The purple 
clay with chalk débris 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 Hast Lincolnshire.“ Sand and 
gravel beds in ¢, from one of which at the beach line immediately north of Bridlington Harbour the 
Bridlington shells referred toin 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. / Sands and gravels posterior to e, and which at Hornsea 
contain fresh-water mollusca. /’. Still later gravel, principally composed of chalk fragments. The recent 
Cyclas marls omitted. The asterisk marks an interval omitted of four miles. + marks the source of the 
Hertford river, which, rising near the cliff, flows away from it inland. The lowest part of ¢, or that with 
the chalk débris 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 Hast 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. 
é 
