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Unformatted text preview: "appearance" might have been exposed, eroded, reworked, etc. moving the observed first appearance up in time). Thus the duration of lineages will be "pulled" toward the recent (pulled implies an artifact of increased likelihood of a fossil to be recorded in younger rocks). Similarly, and extant group with a single fossil occurrence has a temporal range from its fossil date through to the present, but and extinct group with a single fossil occurrence has only that single date as a temporal range, even if it lived for a long time but was not deposited as a fossil. Biases aside, what does the record tell us? Does diversity increase with ti...
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- Fall '10