Imperfection of the Geological Record

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 IX: On the Imperfection of the Geological Record

Defends gradualism against paleontological gaps.

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Chapter X: On the Geological Succession of Organic Beings

Argues that fossil sequences support descent with modification.

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