fossil
horn coral
Heterophrentis sp.
The tell
A curved cone, wide at one end and pointed at the other, with fine ribs radiating inside the wide end like the spokes of a wheel.
It is a single coral animal that lived alone rather than in a colony, which is why it looks like a horn instead of a honeycomb.
What it gets mistaken for
- gastropod
- cephalopod
- tooth
- shell
The facts
- also calledHeterophrentis sp.
- age~380 million yrs
- where it turns upAlpena & Rockport best ยท statewide float
- 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 horn coral will ever be printed, then the run is retired.
10% of every order goes to the Roscommon County Animal Shelter.