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The Wood That Built London: Thames

The wide, sluggish Thames meandered between creeks and marshes over beds of alluvial clay, sedimentary deposits laid down in an ancient sea. Beneath Norwood Hill lies a bed of fossilised oysters, while workmen digging the railway tunnel under Sydenham Hill in the nineteenth century unearthed a rich deposit of marine fossils. On the southern shore of the river lay the marshes of present-day Deptford; beyond them, at Brockley, a ridge of clay hills began to rise to the south, through Telegraph Hill, Friern Hill and Oak of Honor Hill, reaching twin summits at Sydenham Hill and Norwood. From there, it dropped precipitously towards Croydon, where it met the chalk of the Weald.

From The Wood That Built London by C.J. Schüler

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C.J. Schüler

C.J. Schüler