This is Throwback Thursday #3.  In these, we look back in the past at ESCONI specifically and Earth Science in general.  If you have and contributions, (science, pictures, stories, etc …), please sent them to email:esconi.info@gmail.com.  Thanks!

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The following pictures are from a field trip to Pint’s Quarry in Iowa in May 1977.  These photos come from Kathy Dedina.  She and Julie appear in the first photo.  Pint’s was a Fluorine-Fluorite mine near Raymond, Iowa. The host rock is of middle Devonian age – 393 to 382 million years ago.  It is known for minerals and fish fossils (Arthrodire fish – Macropetalichthys, Rhynchodus, and Ptychodus).   The rock formation is the Cedar Valley Limestone.