This is the “Fossil Friday” post #107.  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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This week’s Fossil Friday is again Annularia.  The difference is this one is from Vigo County, Indiana.  The Carboniferous fossils from Indiana are thought to be a few million years younger than Mazon Creek, which dates to about 307 million years ago.  The species in Indiana may be different than Mazon Creek, but this looks quite similar to Annularia sphenophylloides.  We covered Annularia inflata in back in Mazon Monday #60.