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The Mascall Formation dates from about 15 million years ago. The ash deposits and erosional outwash materials that became the Mascall Formation were from the Strawberry Volcanoes that stood to the south at that time. Lush grasslands and hardwood forests, similar to the eastern U.S., were home to a great variety of animals that we might recognize as horses, camels and deer as well as bears, weasels, dogs, and cats.