124 DAKYNS : GLACIAL BEDS AT BRIDLINGTON. 
At Potter Hill the cliff rises to over fifty feet above 
mean tide level, and continues to rise by steps to Sewerby 
Park. Along this part of the cliff the gravels immediately 
overlying the boulder clay are similar in lithological 
character to those last described; but exhibit a striking 
contrast in this, that they are as a rule evenly bedded, and 
free from contortions or intrusions of boulder clay. A very 
thin seam of gravel along the slope of Potter Hill connects 
the two sets. One could wish it were thicker ; for the 
suspicion will cross the mind that it may be merely a wash 
down the hill side of the gravel forming the hill top. It 
appears however to be a bona-fide deposit of gravel in place. 
These evenly-bedded gravels I call, for the sake of 
distinction, the Sewerby gravels. Their general undisturbed 
character, in such striking contrast to the crushed gravels 
not a stone's throw off, makes one hesitate whether to consider 
them as of glacial age or not. Constant search of the cliff, 
however, during the winter storms, at last revealed a spot 
where these gravels too show a decided contortion in their 
lower part. (See figure.) This is near the second fence east 
of Sands Lane. And again at the second fence, south of 
Sewerby Park, these gravels contain a wedge of boulder 
clay of a reddish hue near their base. If then we take the 
Sewerby gravels as a whole, we must allow that they date 
back to the glacial period ; that their deposition commenced 
at all events before that of boulder clay had ceased in these 
parts ; and these gravels have hitherto been treated as a 
whole, though assigned to a post-glacial date. It may be 
however that we really have in these cases two gravels of 
very different age in immediate juxtaposition. There are 
places along Sewerby Park where there certainly are two 
gravels, the upper one chalky, and lying flat over a lower one 
consisting mainly of drift pebbles and undulating ; but as 
we come south from this locality, this distinction ceases to be 
