244 
STATU KR : NOTES ON EAST YORKSHIRE BOULDERS. 
among the smaller specimens which seldom appear as large boulders. 
Among these is a fairly definite group of rocks, which are known 
among East Yorkshire collectors as ])or])hi/rites, and are referred 
with some confidence to the Cheviot Hills. The evidence in support 
of this conclusion may be briefly stated as follows: — (1) The erratics 
seem to match the descriptions of the Cheviot rocks published 
by Mr. J. J. H. Teall and others. (2) Pebbles of these rocks 
increase, both in numbers and in size, as we approach the 
Cheviot district.'-' 
The distribution of both boulders and pebbles would be 
inexplicable under the supposition that the drift had been deposited 
in the sea during submergence of the land, but all the facts fall 
naturally into place if we acknowledge the former existence of 
ice-sheets covering not only the land but the area now occupied 
by the sea. 
References. 
8. V. Wood, jun., and J. L. Rome. "On the (Uacial and Post-glacial 
Structure of Lincolnshire and South-east Yorkshire." Quart. Journ. 
Geol. Soc, ^'ol. XXIV., p. 146. 
J. Phillips. "Illustrations of the (4eoIogy of Yorkshire. Part I. Tlie 
Yorkshire Coast," 3rd edit. 
C. Reid. (Geological Surve\' Memoir. "The Geology of Holderness." 
(t. W. Lamplugh. "The Larger Boulders of Flamboroiigh Head," Parti., 
Proc. Yorks. (ieol. and Polyt. Soc, Vol. IX., p. 340; Parts II. and TIL, 
Vol. XL, p. 231 ; Part IV., Vol. XL, p. 397. 
G. \V. Lamplugh. "Drifts of Flamborough Head." Quart. Jour. (leol. 
Soc, Vol. XLVIL, p. 384. 
T. Sheppard and H. MufF. " Xotes on the Glacial (Geology of Rohin 
Hood"s Bay." (Glacialists' Mag., Vol. IV., Part 2., p. 47. 
J. W. Stather. "Notes on the Drifts of the Humber Gap." Proc. Yorks. 
Geol. and Polyt. Soc, Vol. XIII., Part II., p. 210. 
Reports of the East Riding Boulder Cf>mniittee. Trans. Hull Geol. Soc, 
Vols. L, IL, IIL, IV., V. 
Reports of the Yorks. Boulder Committee. Naturalist, 1887 — 99. 
*This (piestion was carefully investigated during the Yorkshire (Geological 
Society's Meeting at ^^'oole^, and the identity of the porphyrite boulders 
from the East Riding with the Cheviot rock was .satisfactorily establishcKl. 
