STATHER : NOTES ON THE DRIFTS OF THE HUMBER GAP. 217 
hand Belemnitella qiiadrata, a common fossil in the Yorkshire Clialk, 
I have not seen. 
Two or three years ago, tlie erratics scattered on the beach 
below tlie Red Cliff section, presented in small compass as fine a 
natural collection of ice-scratched boulders as one could wish to see, 
owing no doubt to the gentle treatment of the kindly H umber, as 
compared with the rougher wave action on the Holderness beaches. 
Boulders of the well-known Scandinavian types were then not at all 
uncommon, but they are now decidedly rarer owing possibly to the 
local geologists, on whom seems to have fallen the mantles of those 
ancient Vikings, whose delight it was, according to some authorities, 
to carry these stones from place to place. 
Among the many boulders imbedded in these clays I have been 
unable to detect any definite orientation of the longer axes On the 
other hand both here and elsewhere in Holderness, where I have 
studied this point, it has appeared to me that the boulders are 
arranged at random in this respect, and without any sign of 
agreement. 
The boulders of igneous and far-travelled rocks from the Upper 
Clays of this district have (I think) generally a more weathered 
appearance than specimens of the same rocks from the Lower Clays. 
Basalts and other close-grained rocks are often coated with a rusty 
skin, entirely concealing their identity until the hammer is used, and 
the smaller boulders of granite and other coarsely crystalline rocks 
are often rotten throughout. On the other hand the same class of 
rocks from the Lower Clays are comparatively fresh and unweathered, 
The fact that these weathered boulders occur in the Upper Clay and, 
therefore, have been more exposed to post-glacial atmospheric 
agencies, scarely accounts for the excessive weathering and oxidation 
they appear to have undergone. For in the clay side by side with 
these deeply weathered specimens of the harder rocks, we find 
pebbles of chalk in abundance, which surely should have disappeared 
long ago had the disintegrating forces to which they were e.\ posed 
been as great and prolonged as the weathered coats of their harder 
companions seem to suggest. 
