Look, I'll be honest: I don't love 'em all. So to prevent you (or your child) from making a terrible mistake and saddling us with a third-rate state fossil forever, I've ranked all the choices, from absolutely unacceptable to the objectively best option.
Disclaimer: I am not an expert on fossils, just an enthusiast. OK, I honestly haven't thought about fossils much since I was six. But I know what I'm doing here.
9. Endoceras
Pros: Judging by the artist’s rendering, I would not mess with this squid-looking bottom-feeder.
Cons: The fossil itself just kinda looks like a rock. (Yes, I know that’s what fossils are, but there are rocks and there are rocks.) Am I calling this invaluable record of prehistoric life boring? Yes. Yes I am. Fuck Endoceras.
8. Stromatolite (Mary Ellen Jasper) Pros: See what I mean? This is also just a rock, but it's got some noteworthy topography, shaped by a bunch of photosynthesizing bacteria.
Cons: Really though, it still just looks like a rock.
7. Squalicorax (Crow Shark)
Pros: Regular old shark teeth are badass. Teeth from sharks that chomped on dinosaurs are in another category altogether.
Cons: There are a whole lot of shark teeth floating around out there.
6. Homotherium Serum (Scimitar-Toothed Cat)
Pros: Scimitars are cooler than sabers. They just are.
Cons: Still just a tooth.
5. Mammuthus Columbi (Columbian Mammoth)
Pros: Aside from dinosaurs themselves, nothing says "fossil" like a mammoth tusk.
Cons: Already the state fossil for Alaska, Nebraska, South Carolina, Vermont, and Washington. Unacceptable.
4. Dikelocephalus Minnesotensis (Trilobite)
Pros: Has “Minnesota” in its name.
Cons: We come now to the eternal question: Are trilobites “classic” or “basic”? At the risk of betraying my childhood, I lean toward the latter option. You seen one trilobite, you seen ’em all. Also, it’s in the Smithsonian, which is not in Minnesota.
3. Castorioides Ohioensis (Giant Beaver)
Pros: A sentimental favorite. Partisans for this bear-sized beaver tried and failed to get it recognized as the state fossil in 1988, but the legislature balked.
Cons: I’m trying to visualize how these three fossilized bits work together. I don’t know, maybe it's just a lack of imagination on my part. Too abstract.
2. Bison Antiquus
Pros: Looks just like it says. You see the fossil and you think, yep, that’s a bison.
Cons: Just not old enough. This bison was roaming around till almost 6,000 years ago. That's like yesterday in fossil ages.