A few inches of a fossilized log within the 346 square miles of the Petrified Forest National Park in ArizonaSeptember 10, 2013
Over time, trees died or perhaps were knocked over by flood waters or wind. Rivers carried the trees into the lowlands, breaking off branches, bark, and small roots along the way. Some trees were deposited on the flood plain adjacent to the rivers and others were buried in the stream channels. Most of the trees decomposed and disappeared. But a few trees were petrified, becoming the beautiful fossilized logs we see today.