River in central and eastern Java with Pliocene and Pleistocene remains and stone tools. The levels include the Pucangan, lower-middle Pleistocene c 3-2 million years BC; Kabush, middle Pleistocene c 1.4-0.7 million years BP; Notopuro; and High Solo Gravels (High Terrace) of the upper Pleistocene c 0.5 million years BP (associated with Solo Man).