Alt Text

Map of the Continental Ice Sheet that covered Canada and a portion of the northern United States 25,000 years ago. The land covered in the ice sheet is shown in gray outlined in blue. The other areas are shown in beige outlined in gray.

Extended Description

The borders between Canada, the United States, Mexico, and countries in Central America are outlined but states and smaller countries in Central America are not labeled. The Continental Ice Sheet covered all of Canada as well as a portion of northern US states including modern-day Washington, Idaho, Montana, North Dakota, South Dakota, Nebraska, Kansas, Missouri, Iowa, Minnesota, Wisconsin, Illinois, Indiana, Michigan, Ohio, Pennsylvania, New York, New Jersey, Connecticut, Rhode Island, Massachusetts, Vermont, New Hampshire, and Maine.

A black dot in Nevada represents Tule Springs Fossil Beds National Monument in Nevada, which sits far south of the ice sheet.