David Nicol; Cope's Rule and Precambrian and Cambrian invertebrates. Journal of Paleontology ; 40 (6): 1397–1399. doi:
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The phyletic trend toward increase in size of invertebrates (Cope's Rule) is invoked to account for the sudden appearance of shelly forms in the Cambrian. Earlier forms may have been too small and poorly organized to secrete shells.
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