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Some of the more significant landform theories of the past 200 years or so are considered here, with particular attention to the degree to which they reflect the list of geomorphic constraints cited above. It should be noted that most early theorists operated within the chronological limitations imposed by theologians. During the 17th century, for example, Archbishop James Ussher of Ireland added up the ages of men cited in the Bible and concluded that the Creation had occurred in 4004 bc. John Lightfoot, an English divine and Hebraist, was so stimulated by this revelation that he additionally observed that the ...(100 of 6609 words)