Geologic time chapter 14
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Geologic Time 2015
Ediacaran and Cambriam Biota. Late Proterozoic Buildup (about 570 mya) For all of the 19th century and the first half of the 20th century, the Proterozoic.
The Metazoa (Differentiated Multicellular Animals) An Overview of the Major Groups.
Skeletons in the Closet: the Evolution of Hardparts in Metazoa (and the Cambrian Explosion)
Edicaria-Cambian (1)
Ediacaran and Cambriam Biota
