Concretion?

[KimTexan]

I went out to the North Sulfur River (NSR) again today. I have a few things I have questions about.

I think this is a concretion, but I've never seen one quite like this before and I've certainly never seen one remotely like it in the NSR. All the Red Zone stuff is pretty solid and monochromatic for the most part. This little piece is kind of pretty and cute.

[doushantuo]

Posting this without implying anything,a tidbit by AS:

sechsedisedgeolconcretio2900092-6.pdf

[ynot]

This looks like a layered iron rich sandstone with differential weathering.

[KimTexan]

35 minutes ago, doushantuo said:

Posting this without implying anything,a tidbit by AS:

sechsedisedgeolconcretio2900092-6.pdf

Thank you so much for the article! It's a fascinating and very informative. My areas of knowledge are in biological and clinical sciences. I took a geology class about 30 years ago, but that was the extent of any formal education in the earth sciences. So this is very helpful. I'll have to read it in the morning.

[KimTexan]

31 minutes ago, ynot said:

This looks like a layered iron rich sandstone with differential weathering.

I'm trying to clarify what you're saying. I interpret that you're saying it isn't a concretion, which I can accept that. But then you go on to say "layered iron rich sandstone with differential weathering." Maybe I misunderstand. In my understanding this phrase could apply to concretion too, but I think you're saying no. 

I guess a concretion is generally built/layered around something.

I wish I could go out in my back yard and take pics of some of my concretions that now look like turtles that I found in Arkansas in the Fayetteville Shale I think it was. But I'll have to settle with borrowed pics. Granted these don't look like my pic and they aren't both weathered, but they are layered iron rich looking sandstone and concretion. Sorry to ramble. It's late.

 

All that boils down to asking does your opinion excludes it being a concretion?

I can totally accept a layered sandstone opinion, because it looks a little like PB & J on bread layering sort of thing.

 

[doushantuo]

I posted a definition of a concretion,a while back.

 

[ynot]

1 minute ago, KimTexan said:

I interpret that you're saying it isn't a concretion,

It could be a part of a concretion, or just some iron rich sandstone.

 

3 minutes ago, KimTexan said:

In my understanding this phrase could apply to concretion too,

Yes it can apply to a concretion also.

 

4 minutes ago, KimTexan said:

differential weathering.

 This just means that the softer parts / layers have eroded a little more.

 

No My opinion does not exclude a concretion.

6 minutes ago, KimTexan said:

All that boils down to asking does your opinion excludes it being a concretion?

[KimTexan]

1 minute ago, ynot said:

It could be a part of a concretion, or just some iron rich sandstone.

 

Yes it can apply to a concretion also.

 

 This just means that the softer parts / layers have eroded a little more.

 

No My opinion does not exclude a concretion.

Yes, I get the differential weathering part. Thanks for the clarification.

Its very different from all the other concretions I've seen out in the NSR. It made me curious as to how it ended up so different from the others. I thought maybe I could have misunderstood what it was.

Still, I like it because most of my cool looking concretions are too big to be in the house. This one gets to stay inside.

[fifbrindacier]

You're right, that's a really nice stone.

[abyssunder]

Liesegang rings in differential erosion.

[KimTexan]

40 minutes ago, abyssunder said:

Liesegang rings in differential erosion.

Thank you very much. That is talking a language I can understand "supersaturation-nucleation-depletion cycle". I've had a lot of chemistry. So that makes sense to me. I think that was in the article @doushabto shared.

[doushantuo]

Everytime something like this appears,Liesegang gets called in.

Note: