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. 2015 May 27;10(5):e0125923. doi: 10.1371/journal.pone.0125923

Fig 13. Is the skull of Microraptor IVPP V13320 a composite?

Fig 13

A, the skull of IVPP V13320 under white light conditions shows subtle color differences in the bone across a break in the slab—darker bone proximally and lighter bone distally. B, Under laser light stimulation, the bone fluoresces with the same color pattern observed under white light conditions (see A) indicating that the color differences relate to differences in fossil mineralogy. The latter indicates that the skull is a composite specimen, but it is also possible—but less likely—that the pattern observed reflects variable depositional and taphonomic conditions. Scale bar 1 cm. S2 Fig is a labelled version of this figure (see Supporting Information).