Hertfordshire Puddingstone
Hertfordshire Puddingstone! Sounds lovely doesn't it! Unique to Hertfordshire as the name suggests this stone has been shrouded in myth and legend since the Neolithic. The formation of this rock is still not quite understood but sometime around 80million years ago in the Cretaceous, chalk was deposited in warm clear seas. Flint formed within the chalk as irregular lumps. Then around 55 million years ago in the Palaeocene the chalk was eroded releasing the flints to be rounded by wave action on beaches. Later these iron-stained flints were cemented together by a natural silica cement. As the pebbles and matrix are of a similar hardness the new resulting rock can be cut and polished beautifully. The rock does not outcrop at the surface rather puddingstones seam to appear from nowhere in fields often due to ploughing and erosion adding to the mystery and folklaw surrounding it.
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