Go deeper into the history of each park with scholarly articles and essays from Oxford University Press, freely available for the centennial year.
Periods in the Earth's history when ice-sheets and glaciers advance to cover areas previously not affected by ice. There is evidence of at least six Ice Ages having occurred throughout the Earth's history, the earliest dating back to 2.3 billion years ago. The best known is the most recent Ice Age, which began c.2 million years ago and lasted until the retreat of the ice to its present extent c.10,000 years ago. The last Ice Age produced many of the landforms seen in northern continents and affected sea level on a global scale.