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Ongoing research reconstructing Beringian paleogeography during deglaciation could change that estimate and possible earlier submergence could further constrain models of human migration into North America.The onset of the Last Glacial Maximum after 30,000 years BP saw the expansion of alpine glaciers and continental ice sheets that blocked migration routes out of Beringia.The variation of sea level over time has been reconstructed using oxygen isotope analysis of deep sea cores, the dating of marine terraces, and high resolution oxygen isotope sampling from ocean basins and modern ice caps.A drop of eustatic sea level by about 60 m to 120 m lower than present-day levels, commencing around 30,000 years BP, created Beringia, a durable and extensive geographic feature connecting Siberia with Alaska. Or explore a more remote, untouched Alaska on an expedition that takes you further inside the Inside Passage. Silversea's Alaskan cruise offer “open jaw” itineraries, allowing you to spend more time in each port.Herb tundra dominated during the LGM, due to cold and dry conditions.

Gaze amazed at the astonishing raw landscape as breaching Orcas and playful harbour seals pose for the camera.Birdwatchers and photographers will rejoice too — this is a land where your passion can truly be unleashed.The continents of North and South America were settled by Indigenous peoples from Asia between 10 and 20 thousand years ago after they crossed a land bridge called Beringia that formed between northeastern Siberia and western Alaska due to the lowering of sea level during the last ice age.Coastal areas deglaciated rapidly as coastal alpine glaciers, then lobes of Cordilleran ice, retreated.The retreat was accelerated as sea levels rose and floated glacial termini.

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