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Profile Bill Walker
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Message 1301081 - Posted: 1 Nov 2012, 20:29:30 UTC - in response to Message 1301078.

a sink hole?


No but think along those lines. Remember it is a glacier relic.
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Message 1301325 - Posted: 2 Nov 2012, 17:25:25 UTC

it looks like a kettle moraine
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Message 1301395 - Posted: 2 Nov 2012, 20:33:02 UTC - in response to Message 1301325.

it looks like a kettle moraine


Close enough! It did indeed start as kettle, but has become a bog as the water level dropped around here over the last 15,000 or so years. I would have accepted a kettle or a bog.

For those not up on their glaciers, a kettle starts when a passing glacier digs a big old hole in the dirt,and then leaves a few cubic miles of ice in it when it retreats. Once the ice finally melts you are left with a kettle: a dead end lake where water comes in but doesn't come out. (Sort of a roach motel for water.) At first this looks likes an average round lake, but the lack of water exchange means the water becomes slightly acidic, slightly salty, and very low in oxygen. As a result, only certain species of plant will grow in and and around it, and when they die and fall in the water they don't rot. They become a mat of dead vegetation around the edges with plants growing on top of it, that is the pale yellow stuff you see in the photo. Give this yellow stuff another few thousand years and it becomes peat.

For the bonus points,this is Sifton Bog in London, Ontario. My house is in the top left hand corner of the photo ;).
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Message 1301410 - Posted: 2 Nov 2012, 21:00:54 UTC



Where is this and what significance does this area have
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Message 1301418 - Posted: 2 Nov 2012, 21:15:36 UTC

Glacier related?
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Message 1301428 - Posted: 2 Nov 2012, 21:39:52 UTC - in response to Message 1301410.

Is this an ancient pyroclastic flow?
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Message 1301429 - Posted: 2 Nov 2012, 21:42:23 UTC

Result of an ice dam breaking?

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Message 1301458 - Posted: 2 Nov 2012, 23:03:49 UTC

Ancient sand dune or sea bed?
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Message 1301623 - Posted: 3 Nov 2012, 10:57:47 UTC

The desert near Sierra Nevada?
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Message 1301679 - Posted: 3 Nov 2012, 14:23:22 UTC

answers to all are no and specifically not on the North American continent
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Message 1301687 - Posted: 3 Nov 2012, 14:55:22 UTC

Lava flows?

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Message 1301882 - Posted: 4 Nov 2012, 0:20:48 UTC

lava mats hawaii

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Message 1301890 - Posted: 4 Nov 2012, 0:32:59 UTC

Rift valley?

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Message 1302219 - Posted: 4 Nov 2012, 18:54:13 UTC

Africa?
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Message 1302377 - Posted: 5 Nov 2012, 3:35:25 UTC - in response to Message 1302219.

rift valley and Africa - yes
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Message 1302530 - Posted: 5 Nov 2012, 18:15:26 UTC

bump do we need further hints? I think we are just about there
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Message 1302544 - Posted: 5 Nov 2012, 18:29:09 UTC

Masai Mara. Zebras and wildebeests cross this path to migrate to parks by the millions.
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Message 1302545 - Posted: 5 Nov 2012, 18:33:19 UTC - in response to Message 1302544.

nope but fairly close
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Message 1302550 - Posted: 5 Nov 2012, 18:40:38 UTC

The "Great Rift Valley"?
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Message 1302557 - Posted: 5 Nov 2012, 18:56:18 UTC

With some of the world's largest and deepest freshwater lakes at this point.
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