Upper Yellowstone Falls
The upper falls (44°42′46″N 110°29′59″W / 44.71278°N 110.49972°W / 44.71278; -110.49972) are 109 feet (33 m) high. The brink of the upper falls marks the junction between a hard rhyolite lava flow and weaker glassy lava that has been more heavily eroded.
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