Glaciers of the Ice Age
In the preceding pages, we mentioned the Ice Age, a time when ice sheets and alpine glaciers were far more extensive than they are today. There was a time when the most popular explanation
for what we now know to be glacial deposits was that the material had been drifted in by means of icebergs or perhaps simply swept across the landscape by a catastrophic flood. However, during the
19th century, field investigations by many scientists provided convincing evidence that an extensive Ice Age was responsible for these deposits and for many other features.