1. Africa’s Top Geological Sites,2016
2. Anon, n.d. Ilha do Mel. Available from: (accessed 28.08.17).
3. Arouca Declaration, 2011. International Congress of Geotourism – Arouca 2011. Available from: (accessed 28.08.17).
4. British Geological Survey, 2015. The BGS Geological Walk. Available from: (accessed 28.08.17).
5. An overview of new technologies applied to the management of geoheritage;Cayla;Geoheritage,2014