Evidence Of Iridescence In 40 Million-year-old Feather Fossil
Added: Wed, 26 Aug 2009 23:00:00 UTC
Thanks to rod-the-farmer for the link.
Known for their wide variety of vibrant plumage, birds have evolved various chemical and physical mechanisms to produce these beautiful colors over millions of years. A team of paleontologists and ornithologists led by Yale University has now discovered evidence of vivid iridescent colors in feather fossils more than 40 million years old.
The finding, published online August 26 in Biology Letters, signifies the first evidence of a preserved color-producing nanostructure in a fossilized feather.
Iridescence is the quality of changing color depending on the angle of observation, such as the rainbow of colors seen in an oil slick. The simplest iridescent feather colors are produced by light scattering off the feather's surface and a smooth surface of melanin pigment granules within the feather protein. Examining feather fossils from the Messel Shale in Germany with an electron microscope, scientists have documented this smooth layer of melanin structures, called melanosomes.
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