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. 2014 Mar 13;9(3):e91419. doi: 10.1371/journal.pone.0091419

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© 2014 Boessenecker et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) lateral relationships of non-bonebed lithofacies, prior to bonebed formation. (B) Seafloor erosion during initial transgression; the massive pebbly sandstone (Spm) lithofacies is interpreted as representing proximal bonebed formation and the massive pebbly mudrock (Mpm) is interpreted as distal bonebed formation. (C) Deposition continues, resulting in a basinward shift in facies above the bonebed. Abbreviations: FWWB, fair-weather wave base; SWWB, storm-weather wave base.