LAMPLUGH: GLACIAL SECTIONS. 
243 
down to the banks of the Gypsey Race, and forms a valley-gravel 
extending for some distance on both sides of that stream. 
This gravel may be traced along the bottom of the valley in 
following the stream up into the Wolds,* being especially well 
developed at Boynton, about two miles west of Bridlington. It is 
everywhere far wider and reaches higher levels than is possible for 
the present water. The same chalky gravel appears to show in the 
the cliff section south of Bridlington, as described and figured in 
part II. of this paper. (Fig. 2.) 
I should say the formation of this gravel went on simultaneously 
with that of the marls, so that they are on the whole roughly 
contemporaneous. There is confirmatory evidence of this, in that 
the marls generally have a thin sprinkling of small chalky pebbles 
in them. 
The, Low-level Sand, Gravel and Silt. ('2a.) Where the 
marls exist, they occasionally rest directly on the Purple Boulder 
Clay if that uneven bed comes near the surface ; but oftener they 
are underlaid by the beds marked 2a in the sections. These are 
decidedly older than the marls, but closely connected with them, 
and undoubtedly of fresh-water origin. They vary in character, 
but often take the form of sandy or silty gi^avel with much chalk in 
small sub-angular fragments. Their junction with the Purple Clay 
often shows the peculiarities noticed in the two former parts of this 
paper, the clay intruding into the gravel in long ' tongues. 'f 
Near Trinity Chm-ch patches of peaty stuff occurred in this 
gravel, and I have also the skull and horn cores of a sheep (?) said 
to have been obtained from it. 
The High-level Gravel, Sand and Silt. (2b.) On the boulder- 
clay slopes of Old Bridlington the low-level gravel, 2a, seems to 
rise and pass, without break, into a very rough gravel of rather 
* See Mr. G. Fox Strangways in Survey Memoir " On Oolitic and Cretaceous 
Rocks South of Scarbro'," p. 37, for account of Wold Valley Gravels. 
t See also Mr. J. R, Mortimer in " Sections of Drift in Drainage Works, at 
Driffield" (Proc. Yorks. Geol. and Polyt. Soc, 1881), for similar appearances 
there. 
