Immature feathers in juvenile Enantiornithines from the Early Cretaceous Jehol Avifauna.
[sciencythoughts.blogspot.com]
Most data concerning the integument of the non-neornithine Pennaraptora; the clade that includes all Dinosaurs (including Birds) with pennaceous feathers, comes from the Middle-Upper Jurassic Yanliao and Lower Cretaceous Jehol lagerstatten in northeastern China. Thousands of specimens have been collected from these volcano-lacustrine deposits, hundreds of which preserve traces of integument that are typically rare in the fossil record. These specimens have provided direct evidence of plumage patterns and melanosome-based colouration, revealed extinct feather morphotypes, and shed light on the evolution of individual feather tracts (e.g. crus, tail). Despite this wealth of data, many gaps remain in our understanding. The preserved plumage cannot be considered complete in any specimen, and the two-dimensional preservation of most specimens makes preserved traces difficult to interpret with certainty. Ontogenetic changes in plumage, non-melanosome based colouration, the location of apteryia and much more remain largely unexplored.
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Feel free to reply to any comment by clicking the "Reply" button.Interesting. I wish they had included more detail on the dating.
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