This is Mazon Monday post #204.  What’s your favorite Mazon Creek fossil?  Tell us at email:esconi.info@gmail.com.  Thanks!

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Fossil Friday is here with a beautiful Annularia inflata.  A. inflata is the foliage for Calamites, a genus of extinct horsetail “trees”.  They lived in the coal swamps of the Carboniferous and Permian periods and provide much of the organic material in the coal from those time periods.  You can learn more about A. inflata in  Mazon Monday #60 and Calamites in Mazon Monday #94.

This gorgeous specimen was found in the Mazon River by long-time ESCONI member Marie Angkuw.  She collected the concretion in late summer 2023.  It was opened via freeze/thaw this past winter.   Thanks for sharing, Marie!