A glacial advance in central Chile around 15, 000 years ago, also associated with increased precipitation and the Lake Tauca period, was probably triggered by tropical circulation changes.
32.
Each glacial advance tied up huge volumes of water in continental ice sheets thick, resulting in temporary sea-level drops of or more over the entire surface of the Earth.
33.
Glacial advances occurred 7, 000, 5, 000 and 500 years ago, with the last extending to the entrance of the bay, where it left a huge semicircular terminal moraine.
34.
The lower west side of the cone appears to be partly covered by glacial till suggesting that the cone is older than the most recent glacial advances down Ruby Creek.
35.
Its scattered distribution suggests that the species once spread more broadly across North America, but was almost eradicated by glacial advances, surviving only where it escaped the ice in protected refugia.
36.
The Sturtian glaciogenic succession ( c . 740 unconformably overlies rocks of the Burra Group . " The Sturtian succession includes two major diamictite-mudstone sequences, which represent glacial advance and retreat cycles.
37.
After the basalt flows covered the floor of Behm Canal, another glacial advance scoured away much of the flow, leaving behind "'New Eddystone Rock "'and some of the islands to the northeast.
38.
It is believed that the climate of the Galapagos went through a dry period caused by glacial advances in the Northern Hemisphere, beginning 48, 000 years ago and ending 10, 000 years ago.
39.
Indeed, the time period 1250 1300 was heavily disturbed by volcanic activity, and is recorded by a moraine from a glacial advance on Disko Island, although the moraine may indicate a pre-Samalas cold spell.
40.
The last major changes to the landscape were made during the course of the ice ages by the glacial advances of the Scandinavian ice sheet which gave rise to much of Germany's present-day Northern Lowland.
