Fossil Annularia plant concretion 2"X1.5" Mazon creek formation

Description

Fossil plant concretion 2"X1.5" Mazon creek formation, amazing detail. At least two Annularia are fossilized in the concretion.
Mazon Creek Fossil concretions
The Mazon Creek fossil beds are a conservation lagerstätte found near Morris, in Grundy County, Illinois. The fossils are preserved in ironstone concretions, formed approximately 300 million years ago in the mid-Pennsylvanian epoch (Carboniferous period). These concretions frequently preserve both hard and soft tissues of animal and plant materials, as well as many soft-bodied organisms that do not normally fossilize.
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F-PL-20X15-111020