Fardross Stream ASSI

Fardross Stream cuts through rocks that range in age from approximately 339 million years old (M.y.) to some 335 M.y. and span five distinct geological formations in the Tyrone Group.

It is extremely rare to find the boundary between five formations, so this is an exceptional exposure. The rocks, and the fossils they contain, indicate that they were laid down in a marine environment: as water depth and distance from land slowly increased through time, sand and mud deposition gave way to limestones. Fossils include colonial and solitary corals and brachiopods.