The Joggins Formation is a geologic formation in Nova Scotia. It preserves fossils dating back to the Carboniferous period, including Hylonomus, the earliest known reptile. In addition to fossils, the Joggins Formation was a valuable source of coal from the 17th century until the mid-20th century. The Joggins Formation's spectacular coastal exposure, the Joggins Fossil Cliffs at Coal Mine Point, was named a UNESCO World Heritage Site in 2008.