and Tottenham Lock.

Geology, origin and evolution

The main geological formation underlying the Pymmes Brook catchment area is Eocene London Clay. The uppermost part of this formation - the "Claygate Beds" - has a higher sand content. In some parts of the higher sections of the catchment area, the London Clay is overlain by "Stanmore Gravel" (also known as "Pebble Gravel") and "Dollis

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