Along the road on the way to the river Wye in Riss on Wye are some brilliant red rock exposures.
This is Devonian old red sandstone , these sediments were laid down 400 million years ago.
There is a really informative board which explains the formation of the rocks and also says that there is a geology trail around Riss available at the tourist information office. I’m off there to see if I can find some more wonderful geology while down here.