红岩
The discovery of chipped and flaked flints in the Norwich Crag and Red Crag basement beds in the late 19th and early 20th centuries was claimed as evidence for some of the earliest human settlement in Britain. A typologically diagnostic form of 'eolithic' beak-shaped instrument was proposed by E Ray Lankester, the ‘rostro-carinate’, based upon a ‘Norwich Test Specimen’ flint found in the basal Norwich Crag at Colman's Pit, Whitlingham. The human origin for these Crag specimens was refuted by FN Haward on the basis of a systematic analysis of flint fracture patterns and geological context. The fractures were identified by Warren (1923) as caused by sub-soil pressure flaking.