The organic matter characterization was performed using the Hawk (Wildcat Technology) anhydrous pyrolysis carbon analysis system at the Lithospheric Organic Carbon (LOC) lab, Department of Geoscience, Aarhus University, Denmark. A total of 113 samples were measured and calibrated using IFP 160000 standard. Precision and accuracy of measurements were better than 5 %.

Further Projects MOPGA (Make Our Planet Great Again) Campus France Web: https://www.campusfrance.org/en/mopga-make-our-planet-great-again-funding-programs * Défis Scientifiques program (Rennes 1 University) Web: https://pia.ac-paris.fr/portail/jcms/p2_1634474/defis-scientifiques SAD METOX (Conseil Régional de Bretagne)