E0093 ?Crenulopteris acadica
BOTH HALVES SIDERITE CONCRETION, SPLIT BY FREEZE/THAW METHOD. SPECIMEN 99mm X 23mm (3-3/4" x 7/8"). ACETIC ACID BATH APPLIED. CRUMBLED DURING 12 YEARS OF STORAGE -- VICTIM OF PYRITE DISEASE.
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Photo by Mark Kmiecik
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