A buffered formic acid technique for conodont extraction

Abstract

Formic acid must be buffered with both calcium carbonate and calcium phosphate to be suitable for extraction of conodont elements and other phosphatic fossils from dolomites. All unbuffered solutions and those buffered with only calcium carbonate or calcium phosphate destroy the phosphatic fossils. Experimental effects using different concentrations and different combinations of phosphate and calcium carbonate are diagrammatically illustrated. A 10 percent formic acid solution with 20 g calcium carbonate and 1.2 g tricalcium phosphate per liter leaves conodont elements undamaged even for a period of 129 days. One liter of this solution dissolves 95 g dolomite.