Specifically, members of the Maclurites family fossilized in the Middle-Upper Ordovician Valcour formation (c. 460 mya) that was once the tidal shoreline of proto-North-America.

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Specifically, members of the Maclurites family fossilized in the Middle-Upper Ordovician Valcour formation (c. 460 mya) that was once the tidal shoreline of proto-North-America.