Extended Data Fig. 2: FTIR data for the sedimentary matrix of the fossil feathers analysed.
From: Preservation of corneous β-proteins in Mesozoic feathers
Spectra for fossil feathers are shown in grey; spectra for sedimentary matrix, in black. The data shown for the Green River feather represent a Type 2 spectrum. Data shown represent an average of four spectra for Confuciusornis and Sinornithosaurus feather tissue, an average of three spectra for Sinornithosaurus host sediment, an average of two spectra for Green River feather host sediment and one spectrum each for Confuciusornis host sediment and Green River feather tissue.
