What is the main conflict in Canyons by Gary Paulsen?

Canyons is a novel by award winning writer Gary Paulsen. In this novel, Brennan Cole is a hardworking fifteen year old who tries to avoid the many men who come in and out of his mother's life. However, this is not always possible and Brennan finds himself forced to go on a camping trip with his mother, her new boyfriend, and a church youth group. This trip will change Brennan's life when he finds the skull of what turns out to have been a fourteen year old Indian warrior.