fossil
cephalopod
Nautiloidea (orthocone)
The tell
A straight tapering cone divided into chambers by walls across its width. Horn coral is curved and has ribs, not chambers.
Orthocone nautiloids: the squid ancestors that swam this sea. Some grew to several feet.
What it gets mistaken for
- horn coral
- crinoid
- gastropod
- stick
- concretion
The facts
- also calledNautiloidea (orthocone)
- age~380 million yrs
- where it turns upHuron shore ยท statewide as erratics
- on the chartfossil · 500 stickers ever
Put it on the shelf
Every stone on this chart is drawn and kiss-cut at three inches. The rarer the stone, the fewer exist: only 500 cephalopod will ever be printed, then the run is retired.
10% of every order goes to the Roscommon County Animal Shelter.