The forming of Heishangu

       Heishangu, lying in the junction area between Hubei Fold Belt and Eastern Sichuan Fold Belt, is the intermediate section of Longguxi Anticlinorium, which consists of Mesozoic limestone. Its exposed strata include Silurian, Ordovician and Cambrian period, 500 to 600 million years B.P., one of the most ancient sections of exposed terranes in China. Heishangu is formed for the “Yanshan Movement”, a huge scaled crustal movement around 70 million years B.P., according to experts’ investigation.