Geology Reference
In-Depth Information
Figure 4.9
Miocene mollusk fossils used by Lyell to zone the Tertiary. (Plate 2, volume 3
of Lyell's Principles.) Note, by comparing figures 4.8 and 4.9, the key precepts
of Lyell's method, based on the assumption of time's stately cycle. The later
Miocene fossils are in no way "better" versions of their forebears. They are
simply different as signs of history's passage.
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