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Macromolecular analysis of fossil fish scales from the Cretaceous Las Hoyas Formation (using pyrolysis-gas chromatography-mass spectrometry) revealed a dominant aliphatic composition (C 8 to C 22 ) whereas modern fish scale is proteinaceous (largely collagenous). Structural analysis of the aliphatic polymer using thermochemolysis revealed the importance of ester linkages; saturated...
Abundant and well-preserved fish occur at intervals within the Romualdo Member of the Santana Formation (?Albian, Early Cretaceous) in the Araripe Basin, northeast Brazil. Preservation of large numbers of articulated individuals of similar size on a single bedding plane is consistent with the mass mortality of fish shoals over short time intervals (days or weeks). Preservation can be exceptional,...
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