Fossil Worm: Does It Help Solve Cambrian Explosion Puzzle?
January 14, 2004
A soft embryo of a Cambrian worm, exquisitely preserved, makes Graham Budd (U. of Uppsala, Sweden) ask some hard questions about it and other recently-discovered embryo fossils in the Jan. 15 issue of Nature:1 These fossils raise several questions, to say the least. First, how could they possibly be preserved? Second, why are they concentrated […]
