"Scar" on a fragment of a Carboniferous wood

[Svetlana]

Hello.
It is not possible to define this "scar".
Length - 8 cm.
Fragment of Carboniferous wood.
I would be glad for any help. Thanks.

Have a nice evening

 

[Rockwood]

It's not a scar on the wood, but the pith cavity in the wood.

[Rockwood]

Here is the reference I had in mind.    TFF   

Thought it a good mind exercise to find it.        

[Svetlana]

On 6/21/2021 at 4:21 PM, Rockwood said:

Here is the reference I had in mind.    TFF   

Thought it a good mind exercise to find it.        

Thanks for participating.
But I could not see anything similar to my sample on your link and on the request "pith cavity" on the Internet.
Live it really looks like a large scar, and it is clear that it was not inside the trunk, but outside - this is the outer layer.
Thanks again.

[Rockwood]

14 minutes ago, Svetlana said:

Live it really looks like a large scar,

Good that I added the reference then. What kind of wood is this ? Could you give us more perspective in other views ?

There is a scar like pattern that marks the transition in growth stages of some lycopods that may be a candidate.

[Svetlana]

4 hours ago, Rockwood said:

Good that I added the reference then. What kind of wood is this ? Could you give us more perspective in other views ?

There is a scar like pattern that marks the transition in growth stages of some lycopods that may be a candidate.

I can take new photos or even videos a little later; so far only old photographs are at my disposal.
In addition, I can say that this fragment is broken off exactly along the fibers - this will be seen in additional photographs on the back side, which I will take in a couple of days.
Just in case, for understanding, I'll add a photo from the front side, where I showed the direction of the grain of the tree with green lines.

 

Looking at this, we can conclude that this "Scar" was located almost perpendicular to the trunk of the tree or almost parallel to the surface of the earth. And, as I said, this is the surface of the tree.
In addition, the fragment is broken off along other similar "scars" - the same folds are visible, which I marked in red.
Those. this "scar" was not the only one.

[Rockwood]

I know just what to do. 

Summons help. 

@paleoflor 

[Svetlana]

2 hours ago, Rockwood said:

I know just what to do. 

Summons help. 

@paleoflor 

Thanks

[hndmarshall]

Could this be some type of palm bark or even a thorny/ spiny palm bark?

Edited June 23, 2021 by hndmarshall

[paleoflor]

Unusual preservation and specimen. Not sure what this is, but herewith my two cents. Could it perhaps be a counterpart? The elongate structures on the main surface have a bit of a "calamitalean" look to them (ribs?). If indeed a negative imprint, the "protruding spikes" could be related to a branch scar or other contraction at the node, perhaps? Difficult to judge the photographs on my phone... will have a better look on my pc later.

 

Perhaps you could make a "positive" imprint by pressing the specimen into a piece of clay. Would be interesting to see whether the inverse structure shows characteristics of branch scars. 

Edited June 25, 2021 by paleoflor

[Svetlana]

1 hour ago, paleoflor said:

Необычная сохранность и экземпляр. Не уверен, что это, но вот мои два цента. Может быть, это аналог? Удлиненные структуры на основной поверхности имеют немного «каламитальский» вид (ребра?). Если действительно отрицательный отпечаток, возможно, «выступающие шипы» могут быть связаны с рубцом на ветке или другим сокращением в узле? Трудно судить по фотографиям на моем телефоне ... позже посмотрю получше на моем компьютере.

 

Возможно, вы могли бы сделать «позитивный» отпечаток, вдавив образец в кусок глины. Было бы интересно посмотреть, показывает ли обратная структура характеристики рубцов ветвей. 

Thank you.
I took a few more photos and 2 videos.
I do not know if it will be possible to make a mold. Probably, only as a last resort, if without this it will not be possible to determine this fragment.
Thanks again.
Have a nice day

Few more photos

[Svetlana]

I have only Paint at my disposal, so don't pay attention to the letters, like from a horror movie

[Lone Hunter]

Just a thought, could some kind of wood boring insect be involved?  Bark beetles make a similar pattern.

Edited June 25, 2021 by Lone Hunter

[Svetlana]

27 minutes ago, Lone Hunter said:

Just a thought, could some kind of wood boring insect be involved?  Bark beetles make a similar pattern.

Thanks for participating.
Here's an example of what an insect-eaten Carboniferous wood looks like from this location. Sample size 6 cm.
By the way, it is also a very rare find for the local Carboniferous - the only one for years of searches.

 

[Rockwood]

It looks like a feature caused by an irregularity in preservation. Perhaps a shrinkage crack which wicked in a concentration of more durable minerals. 

The material (wood) does look like a calamites to me.

[Svetlana]

On 6/25/2021 at 3:16 PM, Rockwood said:

It looks like a feature caused by an irregularity in preservation. Perhaps a shrinkage crack which wicked in a concentration of more durable minerals. 

The material (wood) does look like a calamites to me.

Thanks.

 @paleoflor  are you agree, that this is not a scar formed during the life of a plant, but a recession of fossilization?

[paleoflor]

To me the pattern seems to really belong to the plant, but I cannot rule out effects of taphonomy, of course. With the movies and photograph annotated "scar", I can now see that the curvature of the specimen doesn't fit very well with my previous suggestion of this being a negative imprint. I guess it could still be some internal structure related to branching, however. Bulging and distortion of the "ribs" does occur around branches (see attached example of an compression fossil). Very difficult to consider what these branched, follow, segmented stems will look like in different preservation modes. You might want to have a look at literature discussing anatomically preserved calamitaleans. Intriguing specimen in any case!

[Rockwood]

1 hour ago, paleoflor said:

To me the pattern seems to really belong to the plant, but I cannot rule out effects of taphonomy, of course

In my twisted thought pattern that's sort of what I had in mind. I completely missed the reasoning for why it may look different until later, and then it seemed pointless to jump back in. 

[Svetlana]

Thank you all very much for your help!
I will try to find a whole stump or trunk of such a Calamite; perhaps then we can be sure what it is.

Have a nice evening