Sip back and discover Brinkmarsh Quarry near Thornbury, a designated SSSI and one of Britain’s key Silurian fossil sites. Explore fossil-rich Brinkmarsh Beds of the Wenlock Series, dating back over 427 million years, revealing ancient marine life including corals, brachiopods, and rare gastropods. Set within the Tortworth Inlier, this overgrown quarry showcases volcanic ash layers, Celestine veins, and tectonic features, offering a unique glimpse into Britain's dynamic Siluri