433 
ON PHOTOGRAPH OF CLIFF-SECTION AT HILDERTHORPE. 
BY G. W. LAMPLUGH. 
List of some works in which the section has been described, or 
referred to : — 
1. PhiUips, J. 'Geology of Yorkshire.' 3rd ed. Part L, p. 82. 
2. Dakyns, J. R- ' Glacial Beds at Bridlington,' in Proc. Yorkshire 
Geol. and Polyt. Soc Vol. VIL Pt. II. (1879), pp. 125, 126. 
3. Lamplugh, G. W. ' Glacial Sections. Pt. II,,' in Proc. ITorks. 
Geol. and P. Soc. Vol. VIII. Pt. I. (1882), pp. 27 to 38, with 
drawings. 
4. Lamplugh, G- W, 'Glacial Sections. Pt. III.,' in Proc. Yorks. 
Geol. and P. Soc. Vol. VIIL Pt. II. (1883), p. 241 and 251. 
FotSan™ i S^^'^^y ^^^^^i^' ' "''^^ ^^^^^^ Bridlington 
^ox cjtrangways, > , ^^gg.^^ 
6. Reid, Clement. Survey Memoir. ' The Geology of Holderness ' 
(1885), p. 73. 
The photograph issued with this year's proceedings is of a fine 
section in cross-bedded laminated sands and sandy clays in the cliff 
at Hilderthorpe, near Bridlington Quay. 
The place is about 300 yards south of Bridlington Harbour, just 
beyond the sea defences, where there is an excavation for sand at the 
top of the cliff, as shown in the upper right-hand corner of the 
photograph. The height of the cliff at this point is about 45 feet, 
but a short distance to the right there is a rather sudden fall of the 
ground to about 20 feet, whereupon the character of the section 
changes Mrely (as may be seen on referring to the paper No. 3 of 
the abcp '' j). 
The sea is encroaching very rapidly upon this part of the coast 
line, the ^'■>ss between the years 1872 and 1882 having been at the 
average rate of 15 feet per annum, and as the cliff wastes back the 
section is constantly undergoing slight changes. 
At the head of these notes will be found a list of the papers 
known to me which refer to this section. The most detailed account 
is contained in my paper (No. 3 on the list) printed in these pro- 
