OF NORFOLK AND SUFFOLK. 
129 
the latter being gradually left behind by the advancing ice, 
while some of it was carried for a great distance ; as, e.g., the 
Kimeridgian shale of the Fenland, which is found in East 
Suffolk, sixty miles from the parent rock. The boulder-clay 
of East Anglia everywhere thins off towards the periphery 
of the area covered by it. The cannon-shot gravels, however, 
clearly present in places morainic characters, as for example 
in a large section at Maids Morton near Buckingham, where 
they are bedded at a high angle, indicating as Mr. R. H. 
Rastall who visited the place with me, observed, “ a veritable 
tip-heap.” 
The Vale of York is crossed, moreover, a lew miles south 
of that city by two well-marked curvilinear ridges which are 
regarded by Yorkshire geologists as the terminal moraines of 
the Teesdale ice at successive stages in its retreat.* The 
examination of a section of gravel in one of these ridges 
in 1906 showed precisely similar features to j those of the 
Cannon-shot drift of Norfolk, removing all doubt from my 
mind that they originated in a similar way. 
Coarse gravels of the same character as those overlying 
the Chalky boulder-clay in Central Norfolk are associated 
with the North Sea Drift of the north-eastern part of the 
county, being well exposed near the railway station at Holt. 
These seem to bear a like relation to the unstratified drift of the 
first glaciation as do the cannon-shot gravels of Dereham and 
Wymondham to that of the inland glacier. In both cases 
they represent the retreat and final disappearance of the ice. 
Such coarse gravels extend eastward from Holt, forming a more 
or less continuous belt in connection with the Cromer ridge. 
Looking up from the coast road one might suppose the ridge 
to be entirely composed of gravel, but some excavations 
between Cromer and Aylmerton showed, a few years ago, 
that the main mass of the ridge is formed of the Contorted 
Drift, the gravels being bedded up to its seaward face, their 
stratification being conformable to the present contours. 
* These are shown in the Contour Map (pi. iv) of my paper of 1909 
before referred to. 
VOL. IX. 
K 
