A new method for extracting conodonts and radiolarians from chert with <scp>N</scp>a<scp>OH</scp> solution

Abstract Microfossils are important components of sedimentary rocks used for palaeontological, biostratigraphic, palaeoenvironmental and palaeoclimatic investigations. They usually extracted from using an acid solution, which might vary depending on the embedding rock lithology. Here we propose a new method common NaOH (sodium hydroxide; soda) to digest cherts (micro‐ cryptocrystalline quartz) instead standard technique based HF (hydrofluoric acid). This allows collection undamaged specimens different kinds microfossils, such as conodonts, radiolarians, teeth dermal scales, minerology is still preserved (e.g. biogenic apatite in conodonts). The use soda thus recommended, it less dangerous, expensive, better preserves microfossils both shape mineralogy.