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08-Sep-2015 00:22

While there is general agreement that the Americas were first settled from Asia, the pattern of migration, its timing, and the place(s) of origin in Asia of the peoples who migrated to the Americas remain unclear.The archeological evidence suggests that the Paleo-Indians' first dispersal into the Americas occurred near the end of the last glacial period or, more specifically, what is known as the Last Glacial Maximum (LGM), around 16,500–13,000 years ago.

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A drop of eustatic sea level by about 60 m to 120 m lower than present-day levels, commencing around 30,000 years BP, caused the revealing of Beringia as a durable and extensive geographic feature connecting Siberia with Alaska.The settlement of the Americas is of intense interest to archaeologists and anthropologists.Modern biochemical techniques, as well as the accumulation of archaeological and geological evidence, have shed progressively more light on the subject; however, significant questions remain unresolved.The pollen record from the Alaskan side shows shifts between herb/shrub and shrub tundra prior to the LGM, suggesting less dramatic warming episodes than those that allowed forest colonization on the Siberian side.

Diverse, though not necessarily plentiful, megafaunas were present in those environments.The Meadowcroft Rockshelter was named a National Historic Landmark in 2005.