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Burlington-Keokuk FormationOsagean Series, Lower Viséan (presumed)Lawrence County near Greene County border, Missouri, USA
Posted May 12, 2016
Posted May 13, 2016
Thanks! My five year old daughter spotted this one through a penny sized window in a large, very hard chunk of limestone (you can see the weathered spot in the lateral view). She was very happy I didn't destroy it breaking up the matrix!