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Re: weird jurassic dinobird with very weird feathers

Had to find out what's an avialan - Wikipedia article on the subject
actually says that Archeopteryx is Jurassic in origin.

I don't understand what the two parts of this sentence have to do with each other.

Anyway, *Archaeopteryx*, note the _ae_, is Late Jurassic in age (from near the end of that epoch). Are you talking about the age of "*Epidexipteryx*" (which is Late Jurassic or Early Cretaceous, probably near the middle of the latter)?

From the discussion it rather looks as if bird ancestors were a huge clade.

Ancestors aren't a clade -- the definition of "clade" and its synonym "monophylum" is "an ancestor and all its descendants".