the fossils
chain coral
Halysites · gone before the petoskey corals
The tell
The cells are joined in CHAINS, like chain-link fence seen from above, with open space between the links. Petoskey cells all touch.
Silurian, about 430 million years, which makes it one of the oldest fossils on this chart and older than every Devonian coral on it. Drummond Island is the place.
What it gets mistaken for
- petoskey stone
- charlevoix
- syringopora
- honeycomb coral
The facts
- also called(chain coral) · gone before the petoskey corals
- age~430 million yrs
- where it turns upDrummond, Les Cheneaux · scarce downstate
- the field marktubes joined in chains, with holes between links
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