This is “Fossil Friday” post #120.  Expect this to be a somewhat regular feature of the website.  We will post any fossil pictures you send in to esconi.info@gmail.com.  Please include a short description or story.  Check the #FossilFriday Twitter hash tag for contributions from around the world!

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Got some cocktail sauce?  For this week’s Fossil Friday, we have a large delicious Kallidecthes richardsoni shrimp from Pit 11.  This one hails from Pit 11.  K. richardsoni is named for Dr. Eugene Richardson Jr., Curator of Fossil Invertebrates at the Field Museum from the 1947 until 1983.  It was described by Frederick Schram in 1969.  We looked at K. richardsoni back in Mazon Monday #48.  It’s one of the most common shrimp species found in Mazon Creek’s Essex biota.

This specimen is interesting, because it came from a stereotypical jellyfish concretion.  There is even the characteristic depression in the center of the concretion.  So, don’t give up on the ones that look like jellies… you might be surprised!