sentence1: The Nez Perce, Umatilla, Yakama and Colville tribes filed a claim to the skeleton shortly after it was unearthed on 31 July, 1996, on a wide bank of the Columbia river at Kennewick in Washington State.
sentence2: Jim Chatters of Bothell is the scientist who first studied the skeleton after it was found on a Columbia River bank in 1996.