New evidence hints that early humans pass an ancient coastal route along Alaska's Pacific Border to settle in the continent and become the first Americans، as the Technical Times said. A team of scientists led by the University at Buffalo explored four different islands within Alaska's Alexander Archipelago. The team examined boulders and bedrock and concluded that the glacial region melted and had contact with the air and sun some 17،000 years ago. The estimated timing from the current study coincided with previous genetic and archeological conclusions that early humans started journeying deeper into the Americas some 16،000 years ago. At the time، the coastal road may have opened to accommodate this human migration. To support this hypothesis، the team also pointed to a previous discovery of the bones of an ancient ringed seal in the same region. The current study estimated the age of the seal bones was about 17،000 years old، suggesting that the ancient coastal route، indeed، was capable of supporting life. To identify the exact timing of when the ice melted for the coastal route to emerge، the team collected rock samples from the islands. They tested these rock samples using a process called surface exposure dating. The method involved testing the chemicals that accumulated on the surface of the rocks. This chemical composition resulted to the bedrock's sudden exposure to cosmic radiation that came from space. The chemical build up was a reaction to the sudden contact with the sun after being under the ice glaciers for a long time.