Several cooperations partners tested the applicability of the maar sediments for biomarker studies. Some of these results are published (Kappenberg et al., 2020, Hepp et al. 2019, 2016; Bandowe et al. 2014; Anhäuser et al., 2014). High resolution measurements have been undertaken for GDGT paleotemperature, but results have not been published yet (Martinez-Garcia et al., in prep.) Bile acids, stanols and sterils are submitted (Birk et al.,subm. ). Ongoing work by three groups concentrate on DNA analysis, exploring different approaches, all of which apparently work, but need to be expanded before robust results can be obtained.