On August 9, 2000, Tyumski Island in James Bay was scraped clean by Pleistocene ice sheets and crushed by thousands of years of weight, in a study of how Earth's land surface evolved after glaciation. case.

2024/07/0109:47:32 science 1912

August 9, 2000

Tiumski Island in James Bay, scraped clean by Pleistocene ice sheets and crushed by thousands of years of weight, is a study of how Earth's land surface evolved after glaciation case. During the last ice age, the island was buried under kilometers of ice, but since its retreat the island has rebounded (increased in elevation), new beach areas have appeared, and streams and lakes have formed , trees and other vegetation colonize the new territory.

This photo of Tyumensky Island was taken by Landsat 7 on August 9, 2000. Mudflats surrounding the islands brighten the nearshore waters, while rivers on the mainland (lower left, Ontario, Canada) pour brown, tannin-rich sediment into the channel. The island is relatively flat; the highest elevation (about 60 meters) is in the southern part of the island, where forest covers and north-south ridges (beach ridges formed during the Ice Age) alternate with elongated lakes (close-up image).

Along the southern coastline, the beach is delineated by numerous "bathtub rings" formed by the action of waves on the shore from previous sea levels. The waterline is the result of two competing processes. As the Ice Age ended and the ice sheets melted, sea levels rose , but beyond that, the island's elevation rose over thousands of years as it bounced back from being crushed by the giant ice mass. .

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