Note 5 — INTRODUCTION
Reading edition
These clays were deposited from marine waters which flooded the Champlain Valley after the final retreat of the glaciers which completely covered New England during the “Great Ice Age” or Pleistocene Epoch. The Pleistocene Epoch began approximately one million years ago and if the age of the Earth is considered to be five billion (5,000 million) years, then, the clays do record recent geologic history.