All cores of ELSA-20 have neighboring twin cores to cover drilling disturbances. Detailed correlations are done with distinct lithological marker layers (thick dust layer, flood layer, slumps, etc.). A high-resolution correlation of data is in addition made with the 1 mm resolution ISRS670 curves of Corg(Chlorins). The cores from Auel in particular show an identical pattern even in minute details. This allows to correlate the cores precisely; and switch for a continuous sampling from one core to its neighboring cores.