Is this poor ol' specimen finally nailed down?

[Dave Corner]

I don't know if any of you caught this article in Eurekalert or elsewhere. A Niobrara formation fossil found 70 years ago was studied by isolated experts over time. It was first identified as an algae, then a cephalopod, and now as a cartilaginous fish! Ah, the Internet makes it so much easier now...

 

https://www.eurekalert.org/pub_releases/2018-04/amon-faa041618.php

[piranha]

Thanks to the quirky rules of priority and nomenclature, it will be forever immortalized as the flat-stone-alga-fish: Platylithophycus