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Interstadial tree stumps

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These interstadial tree stumps in the Muir Inlet of Glacier Bay National Park and Preserve may look unimpressive, but they are important witnesses to the park's glacial history. Glacier Bay National Park in Southeast Alaska is the largest known repository in North America of interstadial wood from the Holocene period, which began about 11,700 years ago and continues today. Interstadial wood is not fossilized; rather, it was frozen and unfrozen when glaciers advanced and receded in the bay. The forest was sheared off when the glacier advanced but left the stumps behind. Scientists can study the rings of these trees for clues to the glacial timeline of the park. Some stumps in the park date to over 9,000 years ago, and twigs date to 13,700 years ago.

Glacier Bay National Park is located in southeast Alaska. The park is also an important marine wilderness area known for its spectacular tidewater glaciers, icefields, and tall coastal mountains. The park, a popular destination for cruise ships, is also known for its sea kayaking and wildlife viewing opportunities.

Glacier Bay National Park is home to humpback whales, which feed in the park's protected waters during the summer, both black and grizzly bears, moose, wolves, sea otters, harbor seals, Steller sea lions, and numerous species of sea birds.

The dynamically changing park, known for its large, contiguous, intact ecosystems, is a United Nations biosphere reserve and a UNESCO World Heritage site.

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© John L. Dengler
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Glacier Bay National Park, Alaska
These interstadial tree stumps in the Muir Inlet of Glacier Bay National Park and Preserve may look unimpressive, but they are important witnesses to the park's glacial history. Glacier Bay National Park in Southeast Alaska is the largest known repository in North America of interstadial wood from the Holocene period, which began about 11,700 years ago and continues today. Interstadial wood is not fossilized; rather, it was frozen and unfrozen when glaciers advanced and receded in the bay. The forest was sheared off when the glacier advanced but left the stumps behind. Scientists can study the rings of these trees for clues to the glacial timeline of the park. Some stumps in the park date to over 9,000 years ago, and twigs date to 13,700 years ago.<br /> <br /> Glacier Bay National Park is located in southeast Alaska. The park is also an important marine wilderness area known for its spectacular tidewater glaciers, icefields, and tall coastal mountains. The park, a popular destination for cruise ships, is also known for its sea kayaking and wildlife viewing opportunities. <br /> <br /> Glacier Bay National Park is home to humpback whales, which feed in the park's protected waters during the summer, both black and grizzly bears, moose, wolves, sea otters, harbor seals, Steller sea lions, and numerous species of sea birds. <br /> <br /> The dynamically changing park, known for its large, contiguous, intact ecosystems, is a United Nations biosphere reserve and a UNESCO World Heritage site.