fossil
stromatoporoid
Stromatoporoidea
The tell
Concentric layered domes with NO cells and no eyes. In a broken face it looks like a stack of thin sheets, one over another.
Often walked past as a boring grey lump. They were reef-builders, and a big one is a genuinely uncommon find.
What it gets mistaken for
- petoskey stone
- kona dolomite
- concretion
- plain rock
The facts
- also calledStromatoporoidea
- age~380 million yrs
- where it turns upPresque Isle Co. 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 stromatoporoid will ever be printed, then the run is retired.
10% of every order goes to the Roscommon County Animal Shelter.