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. 2020 Feb 14;6(7):eaax9361. doi: 10.1126/sciadv.aax9361

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Fig. 4 — (A) Fe and Mn concentrations (ppm) in extant and fossil eggshells and fossil mollusks. Letters in the graph refer to specific CL images. (B to E) CL images of fossil eggshell thin sections in cross section used to assess preservation. (B) Well-preserved Devil’s Coulee Troodon, (C) Romanian eggshell (oospecies Megaloolithus cf. M. siruguei) with intermediate preservation, (D) Maiasaura from Devil’s Coulee with intermediate preservation, (E) poorly preserved lambeosaurine from Wann’s Hill, Alberta, Canada. Scale bars, 1 mm. Luminescence correlates with increased Mn concentrations in (A).