The Stones of Stonehenge
A site with a page devoted to each stone at Stonehenge
Type: Rhyolitic Ignimbrite (tuff)
Type: Sandstone with Mica
Stone 40 is of Type: Rhyoitic Ignimbrite (tuff).
Stone 40g is a below-ground stump of Type: Sandstone with Mica, exceptional in that its position has been marked at ground level by a lead cover: