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Someone told me this is what happens to mud at the bottom of a lake
  
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trtlman




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PostPosted: Sep 20, 2017 16:06    Post subject: Someone told me this is what happens to mud at the bottom of a lake  

I got a little more info about it from another website but not much. I was told it's burrows from crustaceans. I would love more info about these if possible, thank you.


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Bob Harman




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PostPosted: Sep 20, 2017 16:27    Post subject: Re: Someone told me this is what happens to mud at the bottom of a lake  

While you might be correct.........worm or small crustacean burrows in mud that then hardened into limestone, this website is primarily about minerals.
You may not get much help here. BOB
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kushmeja




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PostPosted: Sep 20, 2017 16:37    Post subject: Re: Someone told me this is what happens to mud at the bottom of a lake  

They are commonly called Fairey Stones, and I believe that they are clay concretions that were formed by glaciers, although the specific mechanism by which they were formed is not known.
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Bob Carnein




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PostPosted: Sep 20, 2017 17:18    Post subject: Re: Someone told me this is what happens to mud at the bottom of a lake  

They appear to be concretions, possibly with fossils as their "nuclei". The circular one with a hole, for example, may be a crinoid columnal around which the concretion grew. It would help to have a scale of some kind to give an idea of size. I am not aware of a glacier connection?
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kushmeja




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PostPosted: Sep 20, 2017 17:41    Post subject: Re: Someone told me this is what happens to mud at the bottom of a lake  

Bob Carnein wrote:
They appear to be concretions, possibly with fossils as their "nuclei". The circular one with a hole, for example, may be a crinoid columnal around which the concretion grew. It would help to have a scale of some kind to give an idea of size. I am not aware of a glacier connection?


Personally, I'm not sure how they formed, and it seems that there are conflicting explanations of how they formed. From what I've seen online at least, most people claim that they formed underneath glaciers at the bottom of glacial lakes, and are composed of a mixture of calcium carbonate, clay and sand.
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trtlman




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PostPosted: Sep 20, 2017 18:20    Post subject: Re: Someone told me this is what happens to mud at the bottom of a lake  

kushmeja wrote:
They are commonly called Fairey Stones, and I believe that they are clay concretions that were formed by glaciers, although the specific mechanism by which they were formed is not known.


This seems pretty accurate when I google fairy stones. They aren't the only thing under that name but they one of them. It appears mine were coated with limestones.

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Bob Carnein




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PostPosted: Sep 20, 2017 18:31    Post subject: Re: Someone told me this is what happens to mud at the bottom of a lake  

Concretions occur in sedimentary rocks of all ages, both marine and fresh-water. They are common, for example, in the Pennsylvanian and Permian coal measures of the Appalachians, which formed when that area was near the equator and no where near glaciers. They also occur in numerous marine sedimentary units--again, far from any glacial influence. Many appear to be local concentrations of cementing material (often calcite or siderite or sometimes pyrite) formed around a nucleus of organic matter (which is often missing because it was probably fleshy, rather than consisting of hard parts). Although a few examples may have a glacial-lake origin (I'd guess VERY few), this is not their "normal" origin.
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Woody Thompson




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PostPosted: Sep 21, 2017 08:26    Post subject: Re: Someone told me this is what happens to mud at the bottom of a lake  

Concretions can be found in many environments, as Bob noted, but here in New England they typically occur in clay deposits formed in glacial-lake and glacial-marine environments.. The ones from the very large glacial Lake Hitchcock (which extended up the Connecticut River valley from central Connecticut to St. Johnsbury, Vermont) are locally abundant and people like them because of the odd and fanciful shapes.
The sediments hosting the carbonate-cemented concretions generally were deposited in water bodies open to the sky, Nucleation around a sediment particle or fossil may have occurred, and the concretions required some time to grow (not under the retreating glacier margin in this area), The annual varve chronology of Lake Hitchcock is so well dated that you can assign an age to the clay bed(s) in which the concretions formed.
Button Bay State Park in Vermont's Lake Champlain valley owes its names to concretions found in the glacial clay there.
Woody Thompson
glacial geologist
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vic rzonca




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PostPosted: Sep 22, 2017 10:14    Post subject: Re: Someone told me this is what happens to mud at the bottom of a lake  

As an amendment to Woodys comment, the area in the Northeast were concretions are found.


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Bob Carnein




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PostPosted: Sep 22, 2017 10:22    Post subject: Re: Someone told me this is what happens to mud at the bottom of a lake  

It would probably help to know where the items came from. The point I was trying to make is that concretions occur in literally thousands of places, and they usually have nothing to do with glaciation. It's misleading to suggest that, if one finds a concretion, it probably was deposited in a glacial lake.
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