Fossils of stromatolites
Photographer:Geology Department, University College Galway
Year:1988
Description:A photograph of fossils of stromatolites. The caption at the back of the photograph reads "Occasionally representatives of some of the oldest fossil organisms, the stromatolites, are found within the Dalradian. These algal mats were common during the late Precambrian when their metabolism markedly changed the earth's atmosphere.".