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Continually the subject of geological shaping, the Old Faithful Area exhibits signs of glacial activity, catastrophic volcanic eruptions, lava flows, erosion, and mountain building. Rhyolitic lava flows covering the hillsides around Old Faithful and the Upper Geyser Basin date back more than 600,000 years while glacial till deposits formed such notable features as Porcupine Hills and Fountain Flats.The Firehole River drainage has been subjected to years of erosion, and small channels carved into the base of geyser basins are also the result of the Earth’s amazing attritional power. At the opposite end of the geographical scale, mountain building is evident at Craig’s Pass, an area that divides Yellowstone into both Pacific and Atlantic Ocean watersheds.