A 1mi paved interpretive trail loops through this "forest" of molds left 6,000 to 7,000 years ago when molten lava flowed through a stand of ponderosa pine, coating tree trunks, cooling to rock and remaining as casts after the trees themselves had burned away. Considered one of the finest of these rare stands in the Western Hemisphere, the lava casts now share their rocky soil with re-established ponderosas and a variety of wildflowers.