Petrified Forest, Unga Strait

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Petrified logs and stumps are exposed along the eroding shore of Unga Island, Alaska. Unga Island is the largest of the 20 islands in the Shumagin Islands, about 570 miles (919 km) southwest of Anchorage near the tip of the Alaska Peninsula.

The Shumagin Islands were named after Nikita Shumagin, one of the sailors on Vitus Bering's 1741 expedition to North America, who died of scurvy and was buried on Nagai Island. The large islands in the Shumagins include Unga, Popof, Korovin, and Nagai Islands. Smaller islands include Andronica, Big Koniuji, Little Koniuji, Simeonof, Chernabura, and Bird. The total land area is 294,641 acres (119,237 ha). The total island population lives almost entirely in the city of Sand Point, on Popof Island.

The petrified forest, much of it below the tide line, covers about 5 miles (8 km) of beach. On a sunny day, the white and bright petrified tree stumps contrast sharply against the gray-black beach rock. The stumps range in diameter from a couple of feet to about 9 feet (2.7 m) across. These are remnants of a sequoia or metasequoia forest buried as a result of volcanic activity in the Tertiary Period (2-65 million years ago). The petrified forest has scientific significance for the migration of species between Asia and America and help portray the climate and environment of the Aleutian Arc before humans inhabited Alaska. The site is part of the Alaska Maritime National Wildlife Refuge and was designated in 1968. Read more here and here. Click here to download the CoastView app and explore more of Unga Strait and the Shumagin Islands.

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