Isles of Scilly Isles of Scilly The Isles of Scilly (; or "") is an archipelago off the southwestern tip of Cornwall. One of the islands, St Agnes, is the most southerly point in both England and the United Kingdom, being over further south than the most southerly point of the British mainland at Lizard Point. The population of all the islands at the 2011 census was 2,203. Scilly forms part of the ceremonial county of Cornwall, and some services are combined with those of Cornwall. However, since 1890, the islands have had a separate local authority. Since the passing of the Isles
Geology of Cornwall Geology of Cornwall The geology of Cornwall, England, is dominated by its granite backbone, part of the Cornubian batholith, formed during the Variscan orogeny. Around this is an extensive metamorphic aureole (known locally as killas) formed in the mainly Devonian slates that make up most of the rest of the county. There is an area of sandstone and shale of Carboniferous age in the north east, and the Lizard peninsula is formed of a rare section of uplifted oceanic crust. Cornwall forms the tip of the south-west peninsula of the island Great Britain, and is therefore exposed to the full