Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
haustion nnd final termination would be due to
the action of the salt water upon their lower
floating surface. This must take place with
considerable rapidity, especially if aided by ocean
currents such as must have been very potent at
that time wherever open communication with
tropical waters existed.
Thus the exudation of all the contents of these
glaciers would be downward ; they would have
no superficial moraines whatever, and wherever the
snowfall of the year exceeded or equalled the
sun-thaw and earth-thaw of the year, these glaciers could
never come to an end except by marine agency. Hence
the nearly total absence of moraine vestiges in
Arctic Norway, their rarity in other parts of
Scandinavia, and the universality of the till or
boulder clay in every place that under the
supposed condition of deep submergence must have
been under the sea and deep enough to escape
the grinding action of the whole weight of the
advancing glacier.
The reader will now understand why I observed
«/
so carefully the evidences of thinning out of the
ice sheet described in chapter iv. The clear
sweep of open ocean between this coast and the
tropics supplies the conditions of effective
circulation and consequent rapid thawing.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
