Annual lamination and its sedimentary implications in the Yangtze River delta inferred from High-resolution biogenic silica and sensitive grain-size records

► Annual sediment layer develops in a river-dominated delta under monsoon climate zone. ► It could be distinguished by exploring seasonal proxies. ► The proxies include biogenic silica, sediment grain-size. ► A precise sedimentary rate could be reached with the identification of annual layer.