Value of Miwuk Native Artifacts, Mortars, Pestle?

I live at the base of Table Mountain, an area the Miwuk natives occupied long ago. While digging through the river for gold, and tilling my land to plant trees, I’ve uncovered a number of Native American artifacts. These include magnificent pieces of stonework, included three mortars, two pestles, clubs, arrowheads, and more. The pieces whos value is my main concern are the mortars and pestles, they match and were dug up in the same area. They are large, one is 2′ x 1′ and deep, with matching pestle, one foot long, two inch diameter. Another is a foot and a half long, a food wide, more shallow. Another is carved out of a geode, it’s smaller, but has a perfectly round inner, an almost exact hemisphere. It reflects light after cleaning.

I don’t even know where to begin calling. Local museums would love them, I’m sure, but who is trustworthy enough to appraise these things? Who should I communicate with to ensure these artifacts end up somewhere they belong? And when am I getting those big bucks? =)