Fern Seeds

[cngodles]

I was reading one of my textbooks and specifically a chapter about the Carboniferous. There was a photo of seeds next to ferns and I was surprised about how large they were compared to common fern leaves. Then I remembered when peeling up shale/slate in the local stream, I found a rock with several oval pebbles. I thought maybe these were rocks or concretions.

 

After seeing the photo, are some of these perhaps seeds? They also have a line that seems to split them laterally.

[cngodles]

[cngodles]

[cngodles]

These have been sitting out of the water for a month or so now, so they are starting to fracture.

[Fossildude19]

These look like concretions, to me. 

I find similar ones in my area.

 

    

[ynot]

I agree with concretions.

There is to much variance in size for seeds from one plant.

[JohnBrewer]

I think they’re concretions too. They look similar to what I find at a local Carboniferous area. 

[Mark Kmiecik]

I'm not too sure on the concretion. They do very closely resemble Triganocarpus. I would sure love to see a detailed photo of the "lateral line". There is a great deal of variation in size of seeds from the Carboniferous.

[cngodles]

[cngodles]

Here is one from Wikipedia of Trigonocarpus

 

https://en.wikipedia.org/wiki/File:Trigonocarpus.jpg

[Mark Kmiecik]

Thank you for the additional photos. However they do confirm the concretion ID.