Abstract
The Sikachi-Alyan and Sheremetyevo rock art sites are in the province of Lower Amur and Ussuri rock art. A history of their discovery is sketched, and their state of preservation is described. In 2013, many of them were damaged by extraordinary flooding. The effects of water and temperature fluctuations and of wind erosion are assessed. In Sikachi-Alyan, the main factors of rock art decay were silting of boulders with petroglyphs, and their displacement caused by seasonal rise of water-level and ice-drift. In Sheremetyevo, destruction resulted mainly from bioagents. The removal of lichen revealed new petroglyphs, and known ones were recorded in details. Boulders with rare zoomorphic and anthropomorphic petroglyphs were discovered in the riverside bush and on the floodplain terrace.
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