 This haplogroup was found in a skeleton referred to as Anzick-1, found in Montana in close association with several Clovis artifacts, dated 12,500 years ago.The coastal migration models provide a different perspective on migration to the New World, but they are not without their own problems.One such problem is that global sea levels have risen over  since the end of the last glacial period, and this has submerged the ancient coastlines that maritime people would have followed into the Americas.