The Pagodroma Group consists of proximal glaciomarine sediments and crops out in the northern Prince Charles Mountains of East Antarctica. It contains in-situ fossils including diatoms, molluscans, and foraminifers,which provide biostratigraphic constraints on the Pagodroma Group. The Pagodroma Group consists of the Mt. Johnston, Fisher Bench, Battye Glacier, and Bardin Bluffs formations, and their ages are Oligocene-early Miocene, middle Miocene, middle-late Miocene, and Pliocene-early Pleistocene, respectively. Based on the biostratigraphic data, East Antarctica was warm enough to support the growth of vascular plants until the Middle-Late Miocene, although the climatic conditions were harsh. A comprehensive analysis shows that there were several warm periods during the Miocen and Pliocene,suggesting that the ice cap in East Antarctica experienced dynamic fluctuations in the Miocene and Pliocene.