Method of obtaining limy (calcified) or pyritized fossils from limy rocks

摘要

Method for extracting calcified (calcified) and pyritised fossils from calcareous rocks is based on the difference in dissolution rate macrocrystalline and microcrystalline calcite in 38% sulfuric acid and consists of the following steps: - preparing a sample for etching comprising drying the fossil and surrounding rock; - Immersing the dry sample in a container of sulfuric acid which is covered by a lid; - The sample is left in the bath for a period of one minute to 48 hours; - Removing a sample from the bath and washing it under lukewarm water; - Immersing the sample in a neutralizing bath for a period of 1-12 hours; - Removal and drying of the sample. Equipment for the extraction of calcified fossils from calcareous rocks consists of a container of sulfuric acid, a known dryer or drying equipment and cleaning equipment.