210 
NOTES ON THE DRIFTS OF THE HUMBER GAP. BY J. W. STATHRR, F.G.S. 
{Read August 1st, 1896.) 
Plate XXXVII. 
The glacial and post-glacial deposits of South-east Yorkshire 
and North Lincolnshire are divided naturally into separate areas by 
the range of the Chalk Wolds, connected only by the narrow strip of 
drift which passes through the Humber valley, (jood sections in 
this strip occur on both sides of the river, at North Ferriby and 
South Ferriby. In these sections the different beds described in the 
context are revealed, but are best seen in the winter after stormy 
weather. The Ferriby sections have been noticed by several observers, 
and references to them will be found in the works of S. V Wood,'-' 
Jukes-Browne,! and the Memoirs of the Geological Survey.^ The 
South Ferriby section is fairly w^ell described by Messrs. A. J. 
Jukes-Browne and C. Fox-Strangways in the North Lincolnshire 
Memoir above referred to, but of the cliff at North Ferriby no 
adequate account has yet been published. Inasmuch as these sec- 
tions occur directly in the constricted portion of the Humber Gap, 
in drifts linking the glacial deposits east of the Wolds, with those of 
the less known region to the west, and are the only extensive sections 
visible for many miles, a fuller description of them may prove useful 
to glacialists studying the district. 
Physical Features of the District. 
The featureless flats of glacial and recent deposits which border 
the Humber east of the AVolds seldom rise much above the level of 
spring tides, and one consequently looks in vain for cliffs or sections. 
From Paull westwards, on both sides of the Humber for twelve miles, 
* S. V. Wood and J. L. Rome On the Glacial and Post-glacial Structure 
of Lincolnshire and South-east Yorkshire. Quart. Journ. Geol. Soc, vol. 
xxiv., p. 146. 
t A. J. Jukes-Browne. On the Southerly Extension of the Hessle Boulder- 
clay in Lincolnshire. Quart. Journ. Geol. Soc, vol. xxv. , p. 397. The 
Boulder-clays of Lincolnshire ; their Geographical Range and their Relative 
Age. Quart. Journ., Geol. Soc, vol. xli., p. 114. 
X Survey Memoir, North Lincolnshire. 
