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''The small, emerald-colored Grassi Lakes are a popular destination for hikers and rock climbers. They lie at the foot of grey cliffs that are about 75 m (246 ft) high. The cliffs are part of the Cairn Formation, a fossil reef that formed during the Late Devonian period. The primary reef-forming organisms were stromatoporoids, a long-extinct type of bulbous sponge.'' Source: (Note that no drones were used to make this video) ***Subscribe here***:
