WOOD AND ROME LINCOLNSHIRE AND S.E. YORKSHIRE. 163 



Scramblesby and Bolchford, is really a continuation of the same 

 original trough of denudation as the Steeping valley — as is the case 

 also with the valley intersected by section 11, and with the Bain 

 valley north of the part where section 6 cuts it, this trough running 

 parallel with the Wolds. 



Fig. 8 is carried across the south-eastern extremity of the same 

 trough (which is in that part occupied by the Steeping river), and 

 near the southern termination of the Wold. By reason of the 

 Wold narrowing in this direction, we have space to carry this 

 section across it from the Glacial clay of mid- Lincolnshire to the 

 edge of the Hessle clay, where it rises from the low ground of East 

 Lincolnshire. We are thus enabled to see the relative positions of 

 the Hessle clay and of the Glacial clay of mid-Lincolnshire, and the 

 contrast presented by the former as a true Postglacial or valley- 

 formed bed resting against the eastern side of the Wold, to the 

 massive deposit of the latter, out of which and the Wold, together, 

 the trough occupied by the Steeping river has been cut. 



In describing the limits of the Hessle clay, we mentioned that at 

 its southern extremity it entered the trough of the Steeping. This 

 circumstance enables us, by carrying a section (fig. 9) from the 

 part where fig. 8 cuts the Glacial clay at Mavis Enderby to the 

 southern extremity of the Wolds, to show the Hessle clay distinctly 

 lying as a valley-deposit in the trough thus cut out of the Glacial 

 clay and chalk Wold. The contrast between the chalky clay a! and 

 the Hessle clay e in this section is too distinct and complete to admit 

 of the possibility of their belonging to the same formation. 



Fig. 9. — Section across the River Steeping, from Mavis Enderby to the 

 Wold-brow at Welton Mill. 



W.S.W. E.N.E. 



Mavia Steeping North side Wold brow at 



Enderby. Hundleby. Eiver. ofAshby. Welton Mill. 



IB 



1. Oolitic clay. 2. Subcretaceous series. 3. The Eed Chalk. 4. The Chalk, 

 a'.*- The white or excessively chalky clay. e. The Hessle clay. 



The structure of this trough between the part where (in the 

 condition of a tributary to the Bain) it is crossed by fig. 7, and 

 the part where it is crossed by figs. 8 and 9 — a distance of ten miles 

 — is identical throughout in all essential features ; and if the section 

 given by Mr. Judd, at page 247 of the 23rd volume of this Journal, 

 be continued beyond Felletby, by the addition west of that place of 

 a soHd tract of the Glacial clay, first overl5dng for a short distance, 

 and then bodily taking the place of the Subcretaceous beds, and rest- 

 ing on the Oolitic clay, down to which the valleys are cut (in the 

 same manner as in the portion of fig. 7 between Scramblesby and 

 Edlington), that gentleman's section will illustrate this trough at 

 the part intermediate between our figs 7 and 8, the bed " b " of 

 Mr. Judd (or ''peculiar drift") being the Glacial clay a of our sec- 

 tions. The same structure obtains also for several miles further 



VOL. XXIV. N 



