In April 2012, cores were retrieved from the deepest part of Lake Muzelle using a UWITECH piston corer with hammer action. The master core sequence (MUZ12 / IGSN:IEFRA00A4) is composed of two coring holes. MUZ1201 – (IGSN: IEFRA094Y / IEFRA094Z) was retrieved from the lake bottom with a 90-mm-diameter tube, and MUZ1202 was retrieved with a 63-mm tube. A short gravity core, MUZ12P5 (IGSN : IEFRA00A2), was also taken to provide a well-preserved sample of the water–sediment interface.

In June 2014, a set of nine short gravity cores (MUZ14P1 to MUZ14P9) distributed across the deep portion of the lake basin were retrieved using a UWITECH piston corer, allowing us to better understand sediment partitioning throughout the entire lake system.

All cores were split in half lengthwise and archived with the intention of reusability in other projects.

A detailed macroscopic description allowed to determine the different sedimentary facies and to establish the stratigraphic correlations between cores. A composite core was built using clearly identifiable layers in the overlapping sections of cores MUZ1201 and MUZ1202 to obtain a 283.5-cm-long sediment sequence.

The sediment sequence chronology is based on ten 14C measures on terrestrial marco-remains, short-lasting radionuclides measures and secular paleomagnetic fluctuations. 14C measures were carried out using an Accelerator Mass Spectrometry (AMS).

Granulometry :

Malvern 800 / samplingreésolution 1cm / Spectrum from 0_06 to 878_67 micron

Malverne 2000 (ISTERRE)/ / Sampling resolution 1cm / Spectrum frome 0_06 to 2000 micron (ech 01AW-Depth 137 to 149cm)