Upper Cretaceous seed?

[Wrangellian]

I found this one last month at my usual site, Upper Cretaceous Haslam Fm. (Nanaimo Group)

Pretty sure it's plant as it's got that coaly carbonized look. A piece of it appears to be missing but the full outline is there. I'm seeing an oval shaped body (flattened but some thickness still left), surrounded by a flat membrane like an Elm samara.

I don't really expect to come to any conclusions with this one, but thought it was interesting enough to post for ideas. I'd be happy if someone could tell what modern taxon has seeds resembling this one in any way. If nothing, it will end up in the museum for future paleobotanists to inspect. It's not the only seed- or nut-like thing I've found at this site.

Forgot to include something for scale, but it's ~24mm long.

 

[Wrangellian]

Hmmm.. apparently we have a dearth of Cretaceous plant specialists here.. or else the topic got too quickly pushed over to the 2nd page where fewer people browse.