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| Fossil Falls with the Sierra Nevada backdrop. |
Ancient Owens Valley had a bustling population center here, at Fossil Falls. Fossil Falls is a series of cascades along the ancient Owens river, when it was fed by a series of melting glaciers from the Sierras and by a much larger Owens Lake. At this point along the river, a series of basaltic lava flows impounded the valley between 400 and 10 thousand years ago. During the most recent period of glacial Owens River, the waterfall poured over the lava flows and slowly eroded upstream, and an increase in eruptions from nearby Red Hill may have spurred pothole formations in the upper falls. These potholes, formed when rocks or sand get caught in a hole and spin around in a vortex that gradually bores a hole in the rock, are what Fossil Falls are best known for today. Some of them form chimneys over twenty feet deep that open up at the bottom, and many interconnect. The upper falls today is a convoluted maze of these potholes. When the river flowed here, the noise would have been cacophonous and the mist blinding.




