Sip back and discover the fossils and geodiversity of Quarry Steps at Durdham Down in Clifton, Bristol a Site of Special Scientific Interest (SSSI) where the Bristol Dinosaur, Thecodontosaurus antiquus, was discovered. Step into deep time at this unique Triassic site Just a stone’s throw from the vibrant city of Bristol where the first-ever reptile-bearing fissure deposits were discovered in Britain that helped shape our understanding of early dinosaur evolution.