Murphy's Haystacks earned their name in te 1900s when a traveller in a coach saw the formation in the distance. He asked how a farmer could produce so much hay! As the farm was on a property owned by a man called Murphy, the rocks became known as Murphys Haystacks.br/br/Murphys Haystacks are inselberg rock formations on the Eyre Peninsula in South Australia. These pink granite formations have been dated at 1590 million years old.