Check the listing for details. Mazon Creek- Multiple Mazonomya mazonensis concretion- Braidwood, Illinois. Condition: Used. Listed at 49.99 USD. Offered for sale is a very nice multiple (5) Mazonomya mazonensis concretion from Braidwood, Illinois. It is always nice to find “associated” concretions, but one with 5 examples of the same fauna is extra special. This would make a great addition to anyone’s collection.
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