For those wedded to an evolutionary interpretation of life’s history, the fossil and genetic evidence leave the origin of arthropods a major mystery.
The nation’s museum cannot ignore the collection of fossils Walcott sent them from the Burgess Shale. But can they explain them away?
The top-down pattern of appearance of animal phyla during the Cambrian explosion represents major conflicting evidence for Darwinian evolution.
Here’s a sampling of the latest speculations about the Cambrian explosion.