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Flint is a form of silica or Silicon Dioxide (SiO2). It is found extensively in chalky areas around the country, where it is often used as a building material, due to its hardness. Many of Britain's beaches, especially on the south coast, are composed of flint.
Website on flint Link

Warham is a village and civil parish in Norfolk. It is situated about 5 km inland from the north Norfolk coast, 5 km south-east of the town of Wells-next-the-Sea.
This small village has two large medieval churches, All Saints near the village centre and St Mary Magdalen about 500 m away. Just south of the village is Warham Camp a small ancient hillfort earthwork built by the Iceni in the 2nd century BC, known locally as 'the Danish Camp'.
The village has a tiny request stop - Warham railway station - on the narrow gauge Wells and Walsingham Light Railway.