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User: matthew.s.ackerman

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  1. Re:Margin of Error on 4-Winged Proto-Bird Unearthed In China; Predates Archaeopteryx · · Score: 1

    Well, not that I have checked, but perhaps they can tell that specimen A is older than specimen B by a significant amount due to the stratigraphy of the specimens, even though they can't say how old specimen A or specimen B is with any great precision.

  2. Re:PBS covered this... on 4-Winged Proto-Bird Unearthed In China; Predates Archaeopteryx · · Score: 1

    Sorry, microraptor (covered in the nova story) dates from the early Cretaceous, well after Archaeopteryx. This new find dates from the late Jurassic but pre-dates Archaeopteryx finds. This fossil was just found this year. Not every four winged dinosaur with feathers is the same. Jeeze.