A. El Goresy & G. Schmidt comment: We would like to inform the readers of this journal that, in our opinion, in the article by Buchner & Schmieder (2017) inadequate reports are cited and unsubstantiated claims are presented that need to be modified as we will show below.

The authors claimed in Section 3 that ‘The very high content in Fe (around 90 wt %; see Table 1, e.g. Fig. 3f) of the coatings of some of the Opalinus Claystone shatter cones and the resultant high conductivity of the surfaces of these shatter cones allows imaging and EDS analyses on...

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