72 
CLARK : ON THE TEIASSIC BOULDEE, &c. 
former town. The beds are less solidified, and flints, 
naturally, are less oval-shaped. Just by Gunton I noticed also 
a fault, bringing down an iron-stained sandbed, containing 
huge chalk masses, against pure sands, a fall of about six feet. 
The enormous number of faults at Sutton is very striking. 
It will be remembered that they did not much affect the 
general level. Very possibly they may have originated, and 
so also the above, by the irregular yielding of immediately 
subjacent masses. Evidently it took place under enormous 
pressure; the edges were clean cut, and the "burnt" con- 
dition of the pebbles can hardly be accounted for otherwise. 
Lastly, we have below York, the beds already referred 
to, very similar to parts of these deposits, and lying some 
height, comparatively, above the Ouse valley, well exposed 
by gravel pits. That these are re-arranged glacial deposits, 
the constituents having traversed long distances from the 
West Riding, Westmoreland, &c, there can be no doubt. 
Here and there scratched boulders may be found. The 
Permian layer, especially, approached these in several points, 
and although the Triassic deposits did not display such large 
boulders, and not such frequent clays, they forcibly recalled 
to mind our York beds. The pebbles, I understand, are 
probably of Welsh origin. Without making any decided state- 
ment, I will simply say that the impression left on our minds 
was that the difficulty of explaining their present position, 
without admitting the agency of ice, would be extreme. 
[Note. — Mr. William Whitwell, of York, -writes to rne that, 150 yards from 
the line, by the boathouse on the largest lake, and therefore near the second pebble 
cutting, a quarry gives a section 40 feet deep of the same beds. His notes, taken 
on the spot in 1875, describe just the same phenomena, but " indicated some degree 
of deposition, at times, of similar pebbles." " The most prevalent pebble was of 
a coarsely crystalline, somewhat micaceous, purplish, dark grey quartzite, all per- 
fectly smooth and free from angles — no scratches." Again, in 1876, " faint trace s 
of stratification in fine sand-lines, and also occasional lines of larger pebbles." One 
of the Faults appeared almost like a " pipe " filled up with " burnt " pebbles and 
sand, partly in fine lines, "like the pebbles with a perpendicular arrangement," the 
sand-lines being formed of disintegrated quartzite. — J. E. C] 
