Technical Comments

Comment on “A Diverse Assemblage of Late Cretaceous Dinosaur and Bird Feathers from Canadian Amber”

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Science  17 Feb 2012:
Vol. 335, Issue 6070, pp. 796
DOI: 10.1126/science.1216208


  • Fig. 1

    (A to C) Images from (3) of filaments within UALVP 52821 [(A) and (B)] and UALVP 52822 (C), with white arrows added to point to our interpretation of possible internal septa, cell walls, or other features that appear as evidence to dispute hollowness. (D) Photomicrograph of cottonwood seed (Populus tremuloides) with enlarged inset showing similar overall characteristics to the filaments in the amber specimens (15 μm width and outside wall thickness is average 42% of total width). Scale bar, 0.1 mm).

  • Fig. 2

    Similarities of morphological characteristics of amber specimen and seed hair filaments. (A) Image from McKellar et al. (1) of TMP 96.9.334, with white arrows added to show the coiled distal filaments. Scale bar, 0.2 mm. (B) Cottonwood seed hairs (Populus trichocarpa) with thick arrows showing similar coiling, and arrowheads showing semiflattened areas similar to filament observed in figure 2C in (1) (filament width of 9 to 11 μm). Scale bar, 0.1 mm.

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