A vast flood plain crossed by hundreds of river channels. Swollen by tropical monsoons, the rivers flowed northwards over what is now central England, depositing huge thicknesses of pebbly sand. Plants, primitive reptiles and insects colonised the flood plain, and seasonal pools teemed with fish.
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Sherwood Sandstone at Brewhouse
Yard, below Nottingham Castle. The sandstone is soft, allowing excavation of
caves, tunnels and cellars.
(Reproduced by permission of the British Geological Survey.© NERC.
All rights reserved. IPR/24-3C)