Final answer:
Charles Lyell renewed the idea of uniformitarianism in geology in 1830, showing that gradual changes in organisms could be represented in successive fossil layers.
Step-by-step explanation:
The geologist who, in 1830, renewed the idea of uniformitarianism by showing that gradual changes in some organisms could be represented in successive fossil layers was Charles Lyell. Lyell was a geologist who popularized the view proposed by James Hutton that geological change occurs gradually over long periods of time. His ideas greatly influenced Charles Darwin's thinking and provided support for the concept of gradual change in species over time.