Lena Pillars is the name given to a natural rock formation along the banks of the Lena River in far eastern Siberia. The pillars are 150–300 metres (490–980 ft) high, and were formed in some of the Cambrian period sea-basins. The Lena Pillars National Park was inscribed on the World Heritage List in 2012. The site lies less than a day's boat ride upriver (south) from the city of Yakutsk, the capital of the autonomous Sakha Republic. The pillars consist of alternating layers of limestone, marlstones, dolomite and slate of early to middle Cambrian age, which are weathered, producing the rugged outcrops. These types of rocks are commonly formed in marine environments and the horizontal layering and vertical variation indicates marine transgression/regression; with the slate representing the deep marine, slightly metamorphosed shales.
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