A discussion on the sedimentary environment of Shibantan Member of Dengying Formation in the eastern Yangtze Gorges area

Abstract：Based on a detailed study of the rock constituents and sedimentary structure of the typical sediments, the authors found that the depositional?environment?of the Shibantan Member of Dengying Formation was a platform edge shallow - platform margin ramp. According to the outcrop sections and the observation, the authors recognized many depositional characteristics of storm deposits, such as hummocky cross stratifications, scouring-filling structures，graded bedding and convolute bedding. The environment of the Shibantan Member of Dengying Formation was influenced by periodic strong waves or storms, occurring below the normal wave base and above the storm wave base.