Murphy's Haystacks

Murphy's Haystacks are inselberg rock formations located at Mortana, between Streaky Bay and Port Kenny on the Eyre Peninsula in South Australia.

[2] They are made of a pink, massive, coarsely equigranular rock consisting mostly of quartz and orthoclase.

Their appearance may be due to a combination of erosion by underground rainwater and then by subsequent weathering after they were exposed.

Their structural base may be of orthogonal or vertically-aligned sheet jointing.

[5][6] The site is listed on the South Australian Heritage Register.