Would anyone have any sort of idea of how much this Stigmaria fossil might be worth? It is approximately 12 in. x 6 in., I do not know where it originally is from. It was found within the landscape rocks of my sisters house, which is in southwest Ohio. From what I know of these, they are Carboniferous and not typically found around here, since most of the fossils found here (Cincinnati, OH) are usually Ordovician. I was thinking this stigmaria might have been transported with rocks from a quarry for landscaping purposes. The house is over 50 years old, so I have no way of knowing where the rocks came from.
I was thinking of offering my brother in law something for this fossilized tree root (He does not collect fossils by the way.) What would this stigmaria be worth to someone who collects fossils like me?
Thanks to anyone who replies, your opinions will be appreciated.