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. 2021 Jan 14;9:e10703. doi: 10.7717/peerj.10703

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© 2021 Klug et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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(A) Neochetoceras cf. mohri with lamellaptychus in the body chamber, Tithonian, Late Jurassic, Eichstätt, Germany; Liesegang rings deflected by the topography created by the collapsed ammonoid conch and the aptychus. (B–D) Liesegang rings in Fe-rich sediments of the Famennian near Madene El Mrakib, Morocco. (B) Section through bedding. (C and D) bedding plane; (C) detail of D; D, hammer (300 m) for scale. (E and F) Large sandstone boulders, probably correlate of the Hangenberg Sandstone, latest Famennian, near Madene El Mrakib, Morocco; note the desert varnish in E and the differential weathering depending on mineral content in F.