Cuillin range. Cracks and fissures in the rock provided pathways for later magma intrusions, leading to dykes of basalt which are commonly seen across Skye. The Red Cuillin also have volcanic origins, being formed from a later intrusion of acidic, granitic rock. This granite was more uniformly eroded by wind and water than the gabbro and basalt, causing the red hills to have smoother outlines. The Cuillin provide classic examples of glacial topography and were the subject of an early published account by James Forbes in 1846 (who had become a fellow of the Royal Society of Edinburgh aged only nineteen).
South Soufriere Hills and the Soufrière Hills stratovolcano. It ranges in elevation from 200 to 750 m above sea level and contains tropical evergreen forest. Other IBAs on the island are the Northern Forested Ghauts and Centre Hills. The IBA was identified as such by BirdLife International because it supports, populations of bridled quail-doves, green-throated caribs, Antillean crested hummingbirds, scaly-breasted thrashers, pearly-eyed thrashers, brown tremblers, forest thrushes, Montserrat orioles and Lesser Antillean bullfinches. South Soufriere Hills South Soufriere Hills is a 35 ha patch of forest on the island of Montserrat, a British Overseas Territory in the Leeward Islands of the Caribbean Sea.