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This piece of limestone looked like sea shells (clams or brachiopods) at first glance. However it’s one bumpy continuous surface. Any idea? The rock would be around 305 million years old. The rock broke easily along this surface which made it easy to see. Shells typically show white preserved Agagonite on them as well. No such preservation on this surface.

 

Rock from Western Pennsylvania, United States. The surface is wet.

 

Ruler is in inches.

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This looks to me like a jumbled mass of Calamites  bits. 

They were a type of arborescent horsetail. 

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It’s woody, that’s for sure. I looked at it closely in the microscope and there is a thin layer of what is or looks like coal with white veins. I’m starting to believe this is a mass of land plants that got buried at sea.

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Microscope detail showing coal or carbon rich material with white veins. They look like roots, but at close inspection they fill the fissures in the rock.

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Cordiates leaves is another possibility that would explain the absence of transverse features.

The white veins look like conducting tissue (leaf traces) in lycopod cortex/periderm. 

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11 hours ago, cngodles said:

It’s woody, that’s for sure. I looked at it closely in the microscope and there is a thin layer of what is or looks like coal with white veins. I’m starting to believe this is a mass of land plants that got buried at sea.

That would explain it's presence in limestone, and possibly the lack of detail.  :) 

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  • 1 month later...

Carbonaceous films are often indicative of plant remains. 

Also, we find Devonian plants in limestone in upstate/western NY. 

They are not uncommon. 

 

You may have to settle for Calamites sp. 

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I get to take this to show a friend who is at the museum, so he will give this one last look over. The only issue I have with Calamites is the lack of nodes. Throughout everything there, I don’t see any of the node termination points. But I agree with it being a plant, it looks very plant-like. :)

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On 11/29/2019 at 3:28 AM, Rockwood said:

Cordiates leaves is another possibility that would explain the absence of transverse features.

no nodes in them ;)

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