October 13, 2023
Large Mazon Creek Pit 11 Jellyfish Fossil Concretion Essexella asherae
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This is both halves of a large jellyfish fossil concretion from the famous Mazon Creek/Pit11 locality in Will County, Illinois, USA. It has the impression of an Essexella asherae jellyfish. This specimen is of Pennsylvanian/Carboniferous age.From Wikipedia: " Essexella is an extinct genus of scyphozoan jellyfish known from Late Carboniferous fossils containing the species Essexella asherae . See list of prehistoric medusozoans . It is one of the most recurrent organisms in the Mazon Creek fossil beds of Illinois. [1] In the Essex biota of Mazon Creek, it consists of 42% of all fossil finds. [2] Its behavior is speculated to be similar to that of modern-day jellyfish."The concretion containing the fossil is just over 4 1/4 inches long and 4 3/8 inches wide. You will receive the exact item pictured.Shipping is free by USPS First Class Mail to any address in the USA.No shipping outside the USA.
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