"Less than 2000 years ago, the Lost Jim Lava bed was formed from slow moving lava spreading on top of the much older Imuruk lava field. This flow occurred with the top layer of lava cooling as the bottom layer continued moving. The movement of the flowing bottom layer created waves in the hardening top layer. When the lava cooled and turned to rock, the waves become wrinkles in the lava. The smooth wavy texture of the Lost Jim Lava Flow contrasts the broken look of the surrounding Imuruk Lava field which has experienced thousands of years of weathering."
Lost Jim Lava Flow, Bering Land Bridge National Preserve
National Park Service
Thursday, May 19, 2022
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