Area: 15.88 hectares.

This is a new site, listed as of national importance in the Geological Conservation Review. The site is within an Area of Outstanding Natural Beauty. 

Description and Reasons for Notification: 

This is the best example in Cornwall of a mildly metamorphosed, differentiated tholeiitic intrusive greenstone that retains good relict igneous textures and mineralogy. It is characteristic of relatively large intrusive dolerite-gabbro sills in Cornwall and unique in that it is of tholeiitic composition and not alkaline. It is also internally differentiated and contains rare relicts of primary brown amphibole. The sheared and deformed marginal facies has a chemistry indicative of contact metamorphism by hidden, shallow granite extension from the nearby Godolphin diapir.