Chapter IX: On the Imperfection of the Geological Record
Defends gradualism against paleontological gaps.
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From On the Origin of Species by Charles Darwin
Darwin argues that the apparent absence of innumerable transitional fossils reflects the extreme imperfection of the geological record, not the falsity of gradualism.
Chapter X: On the Geological Succession of Organic Beings
Argues that fossil sequences support descent with modification.
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