Article
Solution to Darwin's dilemma: discovery of the missing Precambrian record of life.
Proceedings of the National Academy of Sciences of the United States of America - 20 Jun 2000
Schopf J W
Abstract excerpt
In 1859, in On the Origin of Species, Darwin broached what he regarded to be the most vexing problem facing his theory of evolution-the lack of a rich fossil record predating the rise of shelly invertebrates that marks the beginning of the Cambrian Period of geologic time ( approximately 550 million years ago), an "inexplicable" absence that could be "truly urged as a valid argument" against his all embracing...
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