Imagine nearing the remote, rugged crest of the Gallatin Range in Montana’s Gallatin National Forest. As you scramble up-slope, you put your hand against what appears to be a lightning-blasted stump for balance. But the stump is not weather-polished wood—it’s made of stone.
These are the 50-million-year-old remains of redwoods, pines and sycamores which make up the Gallatin Petrified Forest, where fossilized tree trunks are preserved in so much detail that cellular structures may be seen under a microscope and growth rings are often visible to the naked eye. But how did these trees turn to stone?