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Precambrian-Cambrian Boundary The Cambrian "explosion"--the sudden origin of many diverse phyla--is a strong argument in favor of creation. Two recent articles discuss the "evolutionary puzzle": the first, by Mark McMenamin is titled "The Emergence of Animals" ( Scientific American ) 256 (4), April 1987, pp. 94-102), and includes useful drawings, diagrams, and photographs of fossil forms, their distributions, and trace evidence. McMenamin also summarizes new evolutionary speculation on the problem. The second article, "The Search for the Precambrian-Cambrian Boundary," American Scientist 75 (2), March-April 1987, pp. 157-167, is authored by Simon Morris (Paleontology, Cambridge). Morris writes: Darwin was especially puzzled by this apparent discontinuity in the fossil record. He devoted a substantial section in The Origin of Species to the problem, because he saw that in the absence of a convincing explanation such an event was difficult to reconcile with his newly formulated evolutionary theory. Despite subsequent proposals of a multitude of hypotheses supported by a much greater range of information, the problems set by the fossil record across the Precambrian-Cambrian boundary remain for the most part unsolved. (p. 157)

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