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. 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 chronology of the Lake Muzelle sediment sequence is based on 10 14C measurements on terrestrial macroremains, short-lived radionuclide measurements, and paleomagnetic secular variations. The 14C measurements were carried out using accelerator mass spectrometry (AMS) methods.

The loss on ignition (LOI) analysis was performed following a continuous (0,5mm) sampling step all along the sequence to estimate organic matter (OM) and carbonate content in the sediment, following the procedure of Heiri et al. (2001).

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ISO 19115:2003/19139

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