Walk back 620,000,000 years in 3 hours. Hidden beneath the beautiful forest of Blackhall are the traces of Scotland's elemental past. Local geologist, Don Stewart, will reveal the secrets hidden in the stones, with stories of ancient seas, melting rocks and baking deserts.

Suitable for adults and older children, some rough walking involved. Shooting Greens Car Park, 5 miles west of Banchory.