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On the eastern edge of Toronto is a natural wonder that’s well worth a half-day visit. The Scarborough Bluffs are unique in North America, and their layers of sand and clay offer a remarkable geological record of the great Ice Age. Rising up to 90m (300 ft.) above Lake Ontario, they stretch out over 14km (8[bf]3/4 miles). The first 46m (150 ft.) contains fossil plants and animals that were deposited by the advancing Wisconsin Glacier 70,000 years ago. It was because of the bluffs that Lady Elizabeth Simcoe, wife of the first Lieutenant Governor of Upper Canada (Ontario), decided to name the eastern suburb Scarborough. While rowing past the bluffs in 1793, she was reminded of the chalk cliffs of Yorkshire.