120 



A. J. JUKES-BEOWNE Olf THE 



alluvium at the base of the Chalk escarpment, runs a terrace of 

 gravel, apparently a continuation of that which overlies the western 

 end of the Hessle Clay at Perriby cliff. Whether this gravel is of 

 Hessle age is uncertain. 



The Hessle Clay, however, has been found again in the neigh- 

 bourhood of Wrawby and Brigg, and its exposures will be described 

 in the Explanation of Sheet 86. Its character here is much more 

 variable than on the eastern side of the Wolds. Sometimes it is 

 full of stones, and sometimes hardly a pebble can be found in it; 

 occasionally it passes into a laminated sandy loam ; in colour, how- 

 ever, it still resembles the typical Hessle Clay, being of a reddish 

 brown streaked and mottled with ashen or bluish grey. 



From Brigg it extends southwards, but has only been detected 

 at low levels on either side of the broad valley of the Ancholme. 

 Clays and gravels, apparently belonging to it, have been mapped at 

 Cadney, Hibaldstow, Eedbourn Hays, Waddingham and Thornton 

 Carrs, Owersby Carrs, and near Bishop's Bridge, east of Glentham ; 

 but in some of these localities it puts on an aspect which is very 

 different from that which it usually presents. It becomes a sticky 

 bluish clay, mottled in some places with yellow or brown, and only 

 containing here and there a rolled pebble of quartzite. In this form 

 it resembled weathered Oxford Clay so greatly, that it was at first 

 overlooked, but mapped in subsequently, after a careful and pro- 

 longed examination of the ground by Mr. Ussher and myself. We 

 found that this peculiar clay was everywhere underlain by gravel, 

 and that it sometimes passed into reddish clay, with stones more 

 resembling the ordinary type. 



Beyond Bishop's Bridge, to the east of Glentham, it was no longer 

 traceable in the Ancholme valley ; but south-west of Market Easen 

 a reddish brown clay, mottled with grey and containing small flints 

 and pebbles of chalk, sets in at higher levels. This closely overlies 

 the ordinary grey Boulder-clay of the district, and caps the low 

 ridges separating the valleys of the brooks which flow westward to 

 unite in the Langworth beck. 



There is a considerable area of such clay west of Paldingworth, 

 and again between Swinthorpe and W^ickenby ; and sand and sandy 

 gravel are frequently found in connection with it, both above and 

 below. I only saw these beds in a hasty traverse, made last year 

 after the country had been mapped, but found a fair section of them 

 in the railway-cutting west of Wickenby, the succession here being 

 as below : — 



feet. 



Sandy soil and sand 3 



Red-brown Boulder-clay 1 



Yellow sand full of flints, seen for 1 



? Grey Boulder-clay below (grassed over) — 



These beds are so thin and so badly exposed, that I could not be 

 certain of their identity with the Hessle Clay, but they are very 

 different from the grey Chalky Boulder-clay which surrounds them. 

 South of this point, over a considerable space, as far as the valley of 



