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News : Activity report 2022 | Annual follow-up report of the technical activity in 2021
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Laboratories and analyses - Washing / thin / polished sections
:: Laboratories and analyses >> Washing / thin / polished sections

Biostratigraphic studies related to the NOM surface sampling of those polls.

The sample preparation laboratory is different depending on the nature of the sediment collected, which can be loose or consolidated.

For rock furniture making 500 g of each sample is placed for 24 h in hydrogen peroxide to achieve a separation of the body's mineral matrix. The washings are performed under a constant stream of water on a column of sieves with a mesh are respectively: 0.500 - 0.250 to 0.100 and 0.063 mm.

The residue of each sieve is emptied into a Petri dish and dried at 40 ° C. Once dried, the residue is poured into cellophane bags.

The microfossils identified and will be sorted under the binocular microscope and stored in appropriate cells. They will determine the age of the sediment in comparison with reference collections.

Pour les roches indurées, des lames minces sont confectionnées, observées et étudiées au microscope optique.

 Microfossils seen under the microscope

  Microfossils seen in thin


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Last update :2022-08-11