I found this calamite fossil quite a while ago in Ossett, West Yorkshire, UK and or is carboniferous in age. I also have a few more pieces to it, but I don't want to glue it back together because I wouldn't be able to see the line.
Any ideas what the red line could be?
Please could you put the two halves together then show us a photo of each end?
Thanks for the reply mike. Here is a picture of one of the ends. I can't take a picture of the other end because it was all crumbled when I found it.
Thanks for the extra photos. I had hoped to see the feature in cross section, but I can't.
I think this will be impossibly tricky just from photos.
If the feature represents a woody core, it could suggest Asterophyllites. That's another form genus, supposedly representing the branchlets and foliage of Calamites.