Precambrian rocks of North Mayo
Photographer:Geology Department, University College Galway
Year:1988
Description:A photograph of the Precambrian rocks of North Mayo. There is a hammer in the photograph to indicate scale. The caption at the back of the photograph reads "The Precambrian rocks of North Mayo have endured a long history of intense heat and pressure often deep in the earth's crust. These and similar metamorphic rocks, at least 2,500 million years old, form the foundations of the continents.".