LAMPLUGH : GLACIAL SECTIONS NEAR BRIDLINGTON. 
279 
nortli of Withernsea, continuously to Hornsea, but not beyond, and 
these are the only places where the bed is recognized by them. Later 
researches, however, have made it evident that the horizon which 
Messrs. "Wood and Rome followed between Withernsea and Hornsea 
is not identical with that traced at Dimlington, and that if we 
recognize in the latter the top of the true ' Basement Clay,' then we 
must regard the former as pertaining to a higher horizon, and forming 
the lower portion of the division, elsewhere classed as ' Lower Purple 
Clay.' In 1870, Mr. S. V. Wood, in a paper dealing chiefly with the 
Purple Boulder-clay (Quart. Journ. Geol. Soc, xxvi., p. 90), refers 
again to the Basement Clay in terms which show that he still confused 
it with the 'Lower Purple Clay.' He describes it as a clay 'full of 
chalk/ and frequently applies to it the name ' Chalky Clay ' as a 
distinctive title, whereas, in the Basement Clay at Dimlington there 
is less chalk than in some other parts of the section. Indeed, it is 
quite clear that in this paper it is to what we have since called the 
' Lower Purple ' that the term Basement Clay is applied. 
In 1878, and again, more clearly, in 1881, in papers describing 
the mode of occurrence of the so-called ' Bridlington Crag,' I showed 
(Geol. Mag., dec. ii., vol. v., p. 509, and dec. ii., vol. viii., p. 535) 
that the same clay which formed the base of the cHfF at Dimlington, 
which I supposed to be the ' Basement Clay ' of Messrs. Wood and 
Rome, was undoubtedly also present at Bridlington, and that the 
chief characteristic of the bed in both localities was to be found in 
its inclusion, among other foreign masses, of patches of fossiliferous 
sand and clay which formed the well-known shell-beds. In 1879, in 
describing to this Society the Drift Deposits of Filey Bay (Proc. 
Yorks. Geol. and Polyt. Soc, vol. vii., p. 167), I identified the 
Basement Clay, for the first time north of Flamborough. in an 
exposure on the shore, opposite to the village of Reigliton, finding 
there also streaks of shell-bearing clay included in it. Again, in 
1880, in a paper published in these Proceedings (vol. vii., p. 246), I 
suggested that the Basement Clayprobably existed on Flamborough 
Head near the Lighthouses. 
In the same year there was published Part I of an important 
memoir by Mr. S. V. Wood, " On the Newer Pliocene Period in 
