J0004 ?Mariopteris sp.
By Mark Kmiecik
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BOTH HALVES SIDERITE CONCRETION, SEPARATED BY FREEZE/THAW METHOD & HAMMER BLOW. SPECIMEN 15mm X 8mm (5/8" x 5/16"). BACK SIDE OF CONVEX HALF GLUED BACK ON. MILD SULFURIC ACID BATH APPLIED.
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Photo by Mark Kmiecik
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