Extended Data Fig. 3: Eggshell net enrichment plots resulting from subtraction of the sediment spectral functions from their corresponding eggshell spectral functions. | Nature

Extended Data Fig. 3: Eggshell net enrichment plots resulting from subtraction of the sediment spectral functions from their corresponding eggshell spectral functions.

From: Dinosaur egg colour had a single evolutionary origin

Extended Data Fig. 3

Spectra are at 1,500–1,700 cm−1 ± 2 cm−1 from 6 accumulations, and are base-lined and normalized. Positive values indicate a net enrichment of fossil eggshells in organic compounds relative to their sediment surroundings, whereas negative values indicate a net depletion. Red bands are diagnostic for protoporphyrin IX, and blue bands are diagnostic for biliverdin. a, M. peeblesorum (YPM VP PU 023464). b, South American saltasaurid. c, French titanosaurid. d, H. huangi. e, Mongolian microtroodontid (IGM 100/1323). f, Mongolian microtroodontid (MAE 14-40). g, North American troodontid. h, Mongolian troodontid (AMNH FARB 6631). i, Mongolian troodontid (IGM 100/1003). j, Chinese troodontid. k, D. antirrhopus. l, Mongolian enantiornithine.

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