Man and the Glacial PeriodWright, G. Frederick (George Frederick)
History
Man and the Glacial Period
Wright, G. Frederick (George Frederick)
Glacial epoch; Prehistoric peoples
"On the south side of Flamborough Head the 'buried cliff' previously
alluded to occurs. The configuration of the country shows--and the
conclusion is established by numerous deep-borings--that the preglacial
coast-line takes a great sweep inland from here, and that the plain of
Holderness is the result of the banking-up of an immense thickness of
glacial _débris_. In the whole country reviewed, from Tynemouth to
Bridlington, wherever the ice came on to the land from the seaward, it
brought in shells and fragmentary patches of the sea-bottom involved in
its ground moraine. Space does not permit of a detailed description of
the several members of the Yorkshire Drift, and I pass on to deal in a
general way with the glacial phenomena of the eastern side of England.
"_The East Anglian Glacier._--The influence of the Scandinavian ice is
clearly seen in the fact that the entire ice-movement down the east
coast south of Bridlington was all from the _seaward_. Clays, sands, and
gravels, the products of a continuous mass of land-ice coming from the
northeast are spread over the whole country, from the Trent to the high
grounds on the north of London overlooking the Thames.
"The line of extreme extension of these drift-deposits runs from Finchley
(near London), in the south across Hertfordshire, through Cambridgeshire,
with outlying patches at Gogmagog and near Buckingham, and northwestward
over a large portion of Leicestershire into the upper waters of the
Trent, embracing the elevated region of Palæozoic rocks at Charnwood
Forest, near Leicester.
"Reserving the consideration of the very involved questions connected
with the drifts of the upper part of the Trent Valley, I may pass
on to join the phenomena of the southeastern counties with those at
Flamborough Head. From Nottinghamshire the limits of the drift of the
East Anglian Glacier seem to run in a direction nearly due west to east,
for the great oolitic escarpment upon which Lincoln Cathedral is built
is absolutely driftless to the northward of the breach about Sleaford.
However, along the western flank of the oolitic range true boulder-clay
occurs, bordering and doubtless underlying the great fen-tract of
mid-Lincolnshire; and the great Lincolnshire Wolds appear to have been
completely whelmed beneath the ice.
"The most remarkable of the deposits in this area is the Great Chalky
Boulder-Clay, which consists of clay containing much ground-up chalk,
and literally packed with well-striated boulders of chalk of all sizes,
from minute pebbles up to blocks a foot or more in diameter. Associated
with them are boulders of various foreign rocks, and many flints in a
remarkably fresh condition, and still retaining the characteristic white
coat, except where partially removed by glacial attrition.
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Elsewhere in the archive
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account