Natural Environment during the Living Period of Early Human and Gigantic Ape in West Hubei CHENG Jie, ZHENG Shaohua, GAO Zhenji, ZHANG Zhaoqun, FENG Xiaobo, and WANG Xiaoning (School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083; Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Science, Beijing 100044; Department of Urban and Environment, Peking University, Beijing 100871; Institute of Cultural Relics and Archaeology of Hubei Province, Wuhan, Hubei 430077; Enshi Museum, Enshi, Hubei 445000)