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. 2016 Jul 27;6:30590. doi: 10.1038/srep30590

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(A) A hundred specimens of discs preserved in a pavement. Note the predominance of specimens smaller than 20 mm and some “giant” specimens with maximum size of 150 mm. (B) Pavement showing a large number of discs with different sizes. Note the lack of overlapped specimens and the slightly deformation in the tangent discs indicated by white arrows. (C) Size distribution of all Aspidella in the pavement sample showed in (A). Scale (A,B) the hammer is 27, 9 mm.