424 
THE GEOLOGIST. 
thick, and remarkablo drift, chiefly consisting of vast multitudes of 
Gryplma mcurva, in a rolled and broken state, with a small proportion 
of bits of chalk-flints from the Wold. This drift, which represents the 
destruction of the " gryphite-zone," underlies the lane for nearly two 
miles, and the number of its gryphites is beyond all belief. Again, 
close by, at the village of Everthorpe, there is a deep cutting through a 
drift which is entirely of chalk; and a wide-spread covering of commi- 
nuted chalk-flints, small enough to be used for gravel, overlies the Lias 
under and around all the east, and south, and west of North Cave. 
These various beds of " Local Drift," deposited so very near together, 
arc remarkably distinct from, and independent of each other. We can 
say with certainty whence each was derived ; but, as I have never seen 
them in superposition, I can give no clue at present to their relative 
ages. They appear to enclose only such organic remains as appertain 
to their native rocks ; and the Liassic portions are so strictly local, that 
they may almost have been destroyed and re-arranged in the places 
Avhcre we now find them. There has been a similar destruction of the 
" Gryphite-bed ;" on the other side of the Humber, at "Whitton, where 
the debris is precisely of corresponding appearance ; and, speculating 
sometimes upon the origin of these drifts, I have been inclined to 
attribute them to the action of the river, at a time when it flowed 
much higher than it does now, — a time of which there is ample 
evidence along its shores. This, however, be it said, is a mere 
speculation, and must be taken accordingly at what it may be worth ; 
for this kind of drift is generally diflicult of explanation, and not 
less so here than in other districts. 
/'To be continued. J 
