Geology and Fossils

Nature

The Isle of Wight has some of the most important geology in Britain. The island's rocks span over 100 million years, and the coast exposes geological formations that are of international scientific significance.

The island is famous for its dinosaur fossils. The Early Cretaceous rocks along the south-west coast, particularly at Compton Bay, Brook Bay and Yaverland, have yielded numerous important finds. The Isle of Wight has produced more dinosaur species than any other location in Europe. Species discovered here include Iguanodon, Neovenator, Polacanthus, Eotyrannus and the recently named Comptonatus chasei, found in 2024.

The geological structure of the island is dominated by a central chalk ridge running east to west, which ends dramatically at the Needles. South of this ridge, older rocks are exposed, including the Wealden clays and sandstones that contain the dinosaur fossils. North of the ridge, younger Tertiary deposits form the lower-lying landscape.

The Alum Bay cliffs display vertical bands of coloured sands that demonstrate how geological forces have tilted the rock layers. This dramatic formation is one of the most visited geological sites in the country. The coloured sands have been collected as souvenirs since Victorian times.

Fossil hunting is a popular activity, with the eroding cliffs constantly revealing new specimens. Dinosaur Isle at Sandown has displays of locally found fossils and organises guided fossil walks. The best fossil hunting locations include the foreshore at Yaverland, Brook Bay and Compton Bay, where finds should be reported to the museum.