Freshwater Bay on the Isle of Portland records the change from marine Portland limestone to the lagoonal limestones and soils of the basal Purbeck succession. Shell-rich beds, chert and microbial structures make this an important geological section, but quarry edges and the unverified shore descent require an observation-first visit from open lawful paths. Jurassic, Cliffs, Foreshore, Disused Quarry, Rating: ♦