Heritage Act 1995 Definition: "geology" means the study of the planet Earth as a whole or in part, the materials of which it is made, the processes that act and have acted upon these materials and the products and structures formed by such action, the physical and biological history of the planet since its origin including the history of life preserved as fossils in rocks and deposits at the surface or in layers beneath the surface of the earth, stratigraphic succession, caves, fossil content or any other items of scientific interest, and includes geomorphology, lithology and mineralogy;

• Geological Survey of Ireland

• GSI Map Viewer Page

• GSI Bedrock Map. N Donegal

• Donegal geology, an overview

• K- AND Si-METASOMATISM IN THE DONEGAL GRANITES OF NORTHWEST IRELAND Lorence G. Collins. (PS: You've gotta be a geologist to understand this!)

	Scree slope at Mt Errigal. You don't want to fall down there!
	Rock formations at Dunree
	"Bloody Quartz". This is built into the walls of Doe Castle. Gives Bloody Foreland it's name.