The Scarborough Bluffs are cliffs in Scarborough , a borough of Toronto , on the shores of Lake Ontario . The 14 km long demolition runs east from Victoria Park Avenue into the mouth of the Highland Creek River. They reach a height of up to 65 m. They formed the shores of the prehistoric Lake Iroquois and have several layers due to erosion . The eroded alluvial soils formed the Toronto Islands . The first 46 meters of the sediment layer contain fossil plants and animals that were in a large river delta around 70,000 years ago. The layer above consists of marl boulder and sand; the youngest layer of Scarborough Bluffs is around 12,000 years old.
The Scarborough Bluffs got their name from Elizabeth Simcoe , as they reminded her of the limestone cliffs of Scarborough in her native England . The rocks later gave the name of Scarborough and are now part of the coat of arms in a stylized form. The recreation area Bluffer's Park was built on the edge of the cliffs .