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Location of the Heshang Cave and sampling sites. (A) The dark gray area shows the location of Hubei province. (B) The location of the Heshang Cave indicated by GPS, which lies in the south bank of the Qingjiang Valley, in the middle reaches of the Yangtze River (http://www.google.com/earth/). (C) Outside view of the Heshang Cave. (D) Sampling sites of sediments (S), weathered rocks (P), and bat guanos (G).
