Situated at the eastern end of the Kenilworth Greenway, the cycle and pedestrian path that runs south-east of the new Coventry Road bridge passes through a disused railway cutting, excavated partly through the local natural bedrock. This can seen in the banks adjacent to the path and consists of thick beds of red sandstone. This is the so-called Kenilworth Sandstone, dating back roughly 280 million years to the Permian Period.
The sandstone originated as river sand, deposited on river floodplains at a time when what is now Warwickshire was much closer to the equator, and enjoyed a hot, semi-arid climate. The Kenilworth Sandstone was once quarried locally for building stone, and can be seen in many of the older buildings in and around the town. Kenilworth Castle is undoubtedly the best known example.