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Murphy's Haystacks are the unusually shaped granite outcrops which sit on the central coastline of Eyre Peninsula. The formations are estimated to be nearly 1500 million years old.
The granite hills of the district, including the haystacks, were buried by calcareous dune sand about 30,000 years ago. Subsequent erosion of the surrounding land surface has gradually revealed the forms we see today.
The haystacks are of a pink granite named Hiltaba granite after the homestead of the same name in the Gawler Ranges. It is extensive over the north-western Eyre Peninsula. The mottled colours on the surface of the haystacks are caused by growth of lichen, a tough plant organism which thrives on exposed granite.
The 'haystacks' were named after Dennis Murphy, who used to own the land. A local mail driver gave them the name when he would point them out to passengers during the trip between Streaky Bay and Port Kenny. It is told that from a distance many people would actually mistake the rocks as giant haystacks, marvelling at Mr Murphy's abilities.