The Mammaliferous Crag Formation is a geologic formation in England. It preserves fossils. It is located in Norfolk and extending into Suffolk, primarily around Norwich, with sections in Bramerton and Postwick with Witton.

• List of fossiliferous stratigraphic units in England

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
• Wood, Searles V., A monograph of the Crag Mollusca : with descriptions of shells from the upper Tertiaries of the British Isles. Vol. 1. 2 vols., n.d.

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