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AustraliaEyre Peninsula's Murphy's Haystacks are among the oldest rocks in Australia but they're slowly eroding away

01:30  20 may  2019
01:30  20 may  2019 Source:   abc.net.au

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Dr Gostin said Murphy ' s Haystacks were among the oldest rocks in Australia . " They ' re 1,600 million years old , which is about the average age of the younger Eroding away slowly . Murphy ' s Haystacks are granite rocks and are among the younger rock formations on Eyre Peninsula .

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Eyre Peninsula's Murphy's Haystacks are among the oldest rocks in Australia but they're slowly eroding away© ABC News An 'island-rock' formation in South Australian is believed to have formed billions of years ago and while it is eroding, experts say it is not likely to disappear anytime soon.

Driving from Port Lincoln to Ceduna on South Australia's Eyre Peninsula you can easily miss them.

And if you do, you would have passed the opportunity to see some of Australia's oldest rocks, which academics say are very slowly eroding away.

Murphy's Haystacks are a group of wind-beaten rocks sticking up prominently from the top of a hill on private property, about 40 kilometres south of Streaky Bay.

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Murphy ’ s Haystacks . Eyre Peninsula , SA. Murphy ’ s Haystacks NAME of FORMATION: Murphy ’ s Haystacks LOCATION: South Australia , Eyre Peninsula TYPE of ROCK : Ancient pink Soon the edges of the rock eroded away … … and eroded some more… The rock slowly starts to take shape.

Murphy ’ s Haystacks are ancient wind-worn pink granite boulders that formed 1500 million years ago. Around 40km south of the popular fishing and tourist town of Streaky Bay on SA’ s Eyre Peninsular , they stand like a crooked set of giant’ s molars on a hilltop just 2km off the Flinders Hwy.

The rock formations got their unusual name from a Scottish agricultural expert, who championed the need to harrow land to produce hay, according to an information sign at the site.

He saw the formations in the distance and told travel companions that they were haystacks and that the person who owned the land must harrow their land.

At the time the owner of the property where the rocks are located was Denis Murphy, hence the name Murphy's Haystacks.

It's an inselberg

Associate Professor Victor Gostin, a visiting research fellow at the University of Adelaide, said Murphy's Haystacks were a type of inselberg, which means 'island rock'.

Other inselbergs found across the country include Uluru in the Northern Territory and Wave Rock in Western Australia.

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He said hard granite was left behind after softer materials rotted and weathered away.

"It's that part which sticks up as the haystack.

"The surrounding parts which have weathered into clay, erode and that leaves behind the hard, central parts."

Millions of years old

Eyre Peninsula's Murphy's Haystacks are among the oldest rocks in Australia but they're slowly eroding away© ABC News An 'island-rock' formation in South Australian is believed to have formed billions of years ago and while it is eroding, experts say it is not likely to disappear anytime soon.

Dr Gostin said Murphy's Haystacks were among the oldest rocks in Australia.

"They're 1,600 million years old, which is about the average age of the younger parts of Eyre Peninsula," he said.

"Anywhere east of Eyre Peninsula is much younger; Eyre Peninsula is South Australia's ancient spot."

But he said only the rock's shape was 1.6 billion years old, as the rock itself was believed to be 3 billion years old.

"The actual granite itself is very ancient, but the form of the Haystacks is much more recent, so you can probably go back to the time of the dinosaurs and the weathering of the landscapes."

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Eroding away ... slowly

Dr Gostin said the Haystacks were weathering away and would likely be gone in another billion years.

"It's all differential weathering, parts which remain are the harder parts because they haven't been attacked by weathering or they've been hardened secondarily," he said.

"In other words, they've been hardened by an additional process of having silica cementing the grains together, which creates a crust."

Associate Professor Erick Bestland from Flinders University said the Haystacks were among the slowest eroding rock formations.

"It's probably a combination of the climate, and having a pretty flat landscape."

Dr Bestland said the Eyre Peninsula had "low intensity" rain, so the rocks were not eroded by heavy rainfall.

He added that the area was "tectonically inactive", meaning the region was not affected by the movement of tectonic plates.

"It's very stable, there are no real earthquakes that are moving the rock up or down," he said.

"There are lots of different places in the world you can go and see these kinds of features."

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A family affair

Eyre Peninsula's Murphy's Haystacks are among the oldest rocks in Australia but they're slowly eroding away© ABC News An 'island-rock' formation in South Australian is believed to have formed billions of years ago and while it is eroding, experts say it is not likely to disappear anytime soon.

Murphy's Haystacks have been owned by the same family since in the early 20th century.

Denis Cash, Mr Murphy's grandson and the current owner, was instrumental in opening the inselbergs up as a tourist destination.

"My immediate reaction was, 'No, I don't want to open them up' because of the risk of fires, rubbish, graffiti," Mr Cash explained.

But he said allowing the public to access the rocks was "one of the greatest things" his family had done.

"There was a lot of demand from the public to get better access.

"People walked right across the paddock to the rocks before we opened them up.

"It's such a wonderful thing to be able to share what we've got with the world."

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