hey jim,
sorry for the late response..i drove out there again today and picked up some of the remains of the geode...sometime after the creation of the geodes, silt washed in...incased the geodes...this is the outer covering of silt...now stone...
the two pieces on the left an right came from the spot i picked up the casing...the geode was rotten, and fell apart.
the two center pieces are thumbnail sized.