The Norwich Crag Formation is a series of marine deposits at the base of the Pleistocene Series in East Anglia in eastern England. It includes both sands and clays e.g. the Chillesford Clay and the Easton Bavents Clay which overlie the Red Crag Formation. The Norwich Crag is itself overlain by the Wroxham Crag Formation.
The part of the Norwich crag assigned to the Antian warm stage contains fossils of zebra-like horse and southern elephant, and the cooler Baventian shows little change,with zebra-like horse, southern elephant, Euctenoceros (a deer) and Mimomys (a vole).
Undifferentiated Norwich Crag has yielded clawless otter, fallow and other deer, and gazelles, beaver and most spectacularly, sabre tooth tiger,
Norwich Crag is closely related to the Cromerian interglacial stage (a relatively shorter period of temperate climate change) approximately midway during the Pleistocene epoch,coming at the end of the Quaternary period.