Crickley Hill is now part of a national park, where there is an official geological trail with an Iron Age hill fort nearby. There are a few sites along the official guide taking you through the geological history of the area, but this guide concentrates on the Crickley Member (formerly known as Pea Grit) quarry of the Birdlip Limestone. Jurassic, Disused Quarries, Scree, Rating: ♦