And in the distant future, a geologist examining these beds, might be tempted to conclude that the average duration of life of the embedded fossils had been less than that of the glacial period, instead of having been really far greater, that is extending from before the glacial epoch
to the present day.
The followed Weichselian Glacial ended around 15,000 years ago is the most recent glacial epoch
named after the Polish river Weichsel.
Ramifications of a new glacial epoch
The chart, published in the February GEOLOGY, shows a drowned world of former river valleys, flood plains, and ancient lakes that would have been above sea level at the end of the last glacial epoch
, more than 10,000 years ago.
Then too you will be interested to know that there are many glacial boulders on the island and shore, of a granitic structure similar to the granite of Scotland, so it looks as if they were brought by the ice during the Glacial epoch
from their mother rock away off to the northwest in Scotland.
At the end of the Late Wisconsinan glacial epoch
, fluctuations in the Lake Michigan Lobe of the Laurentide Ice Sheet resulted in the formation of three moraine systems around the south end of the Lake Michigan basin: in decreasing age, the Valparaiso, Tinley and Lake Border ridges.
Summer sunlight then was not strong enough to melt the giant ice caps and end the glacial epoch
Global temperatures in the glacial epoch
swung up and down radically from one millennium to the next.