 Recent findings of grass-like phytoliths in Cretaceous dinosaur coprolites have pushed this date back to 66 million years ago.In 2011, revised dating of the origins of the rice tribe Oryzeae suggested a date as early as 107 to 129 Mya.Wu, You & Li (2018) described grass microfossils extracted from a specimen of the hadrosauroid dinosaur "Equijubus normani" from the Early Cretaceous (Albian) Zhonggou Formation (China).