Comment on 'Redox conditions, productivity, and volcanic input during deposition of uppermost Jurassic and Lower Cretaceous organic-rich siltstones in Spitsbergen, Norway' by Rakociński et al. (2018). (April 2019) - Hammer, Øyvind; Alsen, Peter; Grundvåg, Sten-Andreas; Jelby, Mads E.; Nøhr-Hansen, Henrik; Olaussen, Snorre; Senger, Kim; Śliwińska, Kasia K.; Smelror, Morten