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`Irony` actually does mean `metal like`...

Er, you know he could be right. It looks like there is an almost perfect circle superimposed on the landscape of the Australian outback. It looks to be centred around Coober Pedy (an opal-mining town). The circle even extends out into the Great Australian Bight (the sea). Hmm.

clop

Hum,
strangely i had came across the same structure just last week...
centred on
Latitude: -23.21185 Longitude: 132.48370

Of course i thought of impact structures, but i put it down to a recently discovered massive volcanic episode and the rotation of the entire continent.

<gravity map> <normal view>

Attached Images

	132.07245E_24.51444S.jpg (48.6 KB, 98 views)
	132.15740E_25.58530S.jpg (49.7 KB, 90 views)

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`Irony` actually does mean `metal like`...

Maybe I'm not seeing this right, but Coober Pedy looks like its on the inside of a perimeter ring. Go to that lake east of it, then you follow the terrain around in a circle up to some lakes in the north, then its a coloration change that marks the rest of the circle around.

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The last time I felt a warm fuzzy feeling, I was informed by my doctor that it was just gas.

I liked the detailed instructions on how to view the crater:

I'm not sure it's that obvious. They could have executed a tiny diagram just to provide comfort.

Google Maps: Australia

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That explains Uluru then, doesn't it?

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Hum,
the one i spotted last week, and what i presume is the same `obvious` impact structure is roughly highlighted in the attachment.
i have highlighted the gravity anomalies with stars...(they do not match)

Latitude: -23.21185 Longitude: 132.48370

The Coober Pedy location i cant make out anything that big to fit.

Attached Images

131.74542E_25.85421S.jpg (48.8 KB, 82 views)

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`Irony` actually does mean `metal like`...

hmmms. I note that the uploader of the story was the same as the person mentioned in the story, not that it means much but I'll wait for confirmation.

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Enter the World of Athran

Hum,
yeah, i did notice but its not unusual for such sites - a bit like a laypersons arxiv.

If it is the location of a huge impact i would be very surprised - but it does make for a good geodetective story.

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`Irony` actually does mean `metal like`...

You know - any news story linking Cooper Pedy and the World's Largest Hole will surprise no-one who has ever gone there....

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"I'd take the awe of understanding over the awe of ignorance any day." - Douglas Adams

"Certainly, in the topsy-turvy world of heavy rock, having a good solid piece of wood in your hand is often useful." - Ian Faith

hum,
is Cooper Pedy an Australian way of writing of Coober Pedy?
Latitude -29.0167 Longitude: 134.717

The only nearest giant circle i can find centred near there
Latitude: -26.69985 Longitude: 138.08632
is this: <attachment> (which also doesn't match any gravity anomalies either.)

It is probably safe to resign Coober Pedy back into obscurity and non-mentionment.

Attached Images

138.27989E_26.57348S.jpg (75.9 KB, 61 views)

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`Irony` actually does mean `metal like`...

might this be one in India as well?

The agonized scream you just heard was mine.

Nonsense.

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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.
-- Richard Feynman

Hum,
it is an interesting feature.
Hum,
the tofu structure....

But, perhaps one side is formed by the limit of the deccan trap lava flows and the north is perhaps formed by the indo-asian plate collision

Attached Images

76.35169E_19.49642N.jpg (54.9 KB, 24 views)

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`Irony` actually does mean `metal like`...

Thread moved from BABBling to General Science.

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Everything I need to know I learned through Googling.

Neither one looks very convincing to me.

Maybe all curved geologic structures are worthy of investigation, but I'd need more than what is shown that before moving past the stage of pure speculation.

Is every lake that is roughly round in structure an impact hypothesis waiting to be published?

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Hum,
well, yeah.
but it is something that can `easily` be disproved.

BTW, it should be noted that an impact crater as large as 1400 miles should have punched a hole right through the crust and the interior filled with basaltic magma similar to the Maria on the moon...

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`Irony` actually does mean `metal like`...

In the case of round lakes, it's good to check if they have any real evidence pointing to an impact origin (shock features in rocks, gravitational and magnetic anomalies...), especially if the region under study don't have typically round lakes. One such strikingly round lake ~30 km from where I live turned out to be a real impact crater.

But searching for round patterns in for example Google Maps and announcing that they must be impact craters is just plain stupid. Unfortunately several such "discoveries" have been announced lately.

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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.
-- Richard Feynman

hum,
i recall that one lake crater was discovered to be an impact crater just due to someone noticing it's unusual depth compared to surrounding nearby lakes.

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`Irony` actually does mean `metal like`...

I work with topographic maps every day. When there are no features on a map except for curvy lines, you see lots of things that are approximately round, things you'd never know were there on normal map. I see things that resemble impacts all the time, except that they are just normal topographic features. I think we should leave the impact hunting up to the trained professionals (read: qualified goelogists) because unless you know what you're looking at, you could make very erroneous assumptions. Such a huge impact crater is intriguing, but more evidence is needed.

The crater I referred is this one. Canada has several round lakes and other water bodies that are impact craters. Deep Bay in Reindeer Lake is good example. And it is very deep, 220 m.

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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.
-- Richard Feynman

There is one impact crater in this image. Guess where!

Attached Images

Ahvenanmaa.jpg (64.5 KB, 47 views)

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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.
-- Richard Feynman

Hum,
i would have said the Karikkoselkä lake crater would have been a good candidate if it hadn't already been confirmed.

"it's like spotting Grima Wormtongue amongst the riders of Rohan"

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`Irony` actually does mean `metal like`...

I suggested (half-seriously) that it could be a crater years before it was confirmed.

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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.
-- Richard Feynman

Hum,
there are three candidates i spotted that i would have investigated...

Attached Images

Ahvenanmaa.jpg (67.3 KB, 25 views)

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`Irony` actually does mean `metal like`...

I keep thinking I see one in the Southeastern US

Why do I feel like I am playing where's Waldo

For the life of me I cant see this crater in Australia, and I would suggest the geology agrees with me.

Actually after looking at it a long time, i see two ring like strures, one that's be overlayed by the other. something that made a crater those sizes on dry land, would have left a disernable crater rim struture and valley, even after a billion years.

To me it looks like the Achient signs of two Volcanic Caldera's, similar in size and nature to Yellowstone. The Plate movement is to the north, and from the age of those formations (billions of years easily) i suspect that they were from when australia was further south on the plate. Intrestringly enough there is a hotspot south of australia.

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It'll be interesting to see if this is an optical illusion or not. Like one of those Puzzle Pictures or Galadriel's Mirror. Stare at it long enough and you'll see what you want to see.
The 'crater' I can see on the Google Maps image is centered half a radius to the west and is a little smaller than that outlined above by Blob.

If it is, there a superimposed crater, centered out to sea in the Great Australain Bight (south of the landmass)? It comes ashore at (looks at atlas) Cape Pashley and Fowler's Bay, and encroaches on the Big Crater by about a quarter radius.

Oh, no! That's the Nullarbor Plain!
See: http://en.wikipedia.org/wiki/Nullarbor_Plain. "Thought to be a former seabed" and riddled with cave systems. Is that charateristic of an impact crater?

John

No.

Limestone sinkholes. Well preserved extinct marsupial mammals have recently been found in one sinkhole.

Most of the centre of Australia is sedimentary or metamorphosed sedimentary rock. There is some basalt in Western Ausralia to the west of the centre, in conjunction with large iron ore deposits (and mines).

How does Uluru (Ayers Rock) fit into this impact theory?