(3) Fossil plant and fern leaf concretions Mazon creek formation

Description

(3) Fossil plant concretions 1 to 1.5 inches from Mazon creek formation, amazing detail. At least two fern leaves are fossilized in the concretions.
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-P-3-111120