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
Lower Dicker affinity) and are considered to reflect the effects of tectonic uplift in nearby areas feeding sediment into the area. The mineralogy of these sandstones reflects their provenance and they are therefore of great importance for understanding the changes which took place in the palaeogeography of the Weald. Upper Dicker provides the most southerly exposure of any of the Weald Clay sand members in Britain. It is also important for marking the furthest known extension eastwards of Cornubian (what is today Devon and Cornwall) debris (pieces of rock incorporated into the sandstones and clays), indicating the presence of a river system