This is the “Fossil Friday” post #275.  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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For this week, we have some very nice Crenulopteris acadica specimens from Pit 3. Crenulopteris acadica has had a plethora of names over the years.  It was originally named Pecopteris villosa by Adolphe-Theodore Brongniart and Leo Lesquereux.  George Langford called it Asterotheca lamuriana.  ESCONI’s “Keys to Mazon Creek Plants” referred to it as Pecopteris lamuriana.  While in Jack Wittry’s “Mazon Creek Fossil Flora”, it can found as Lobatopteris lamuriana.  For Wittry’s vastly updated book “A Comprehensive Guide to the Fossil Flora of Mazon Creek”, it was moved to Crenulopteris acadica.  For a very common fossil, its naming has a very complicated history. (see Mazon Monday #115)

These beautiful specimens come from Dave Keenan.   Thanks for sharing, Dave!