Ultrasonic cleaning is a valuable method of extracting delicate calcareous nannofossils from their matrices, but too much sonic energy can damage or even destroy the specimen. A quantitative assessment is made of the most appropriate amounts of ultrasonic pressure necessary to disaggregate the microfossil from the remaining sample and free it of clinging debris. Observational controls, using the scanning electron microscope, suggest that 2.6 gm of sonic pressure is the maximum amount these fossils can endure before destruction.

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