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In 1830, geologist Charles Lyell, developing ideas found in James Hutton's works, popularized the concept that the features of Earth were in perpetual change, eroding and reforming continuously, and the rate of this change was roughly constant.This was a challenge to the traditional view, which saw the history of Earth as static, He assumed that Earth had formed as a completely molten object, and determined the amount of time it would take for the near-surface temperature gradient to decrease to its present value.This led him to estimate that Earth was about 75,000 years old.Other naturalists used these hypotheses to construct a history of Earth, though their timelines were inexact as they did not know how long it took to lay down stratigraphic layers.These layers often contained fossilized remains of unknown creatures, leading some to interpret a progression of organisms from layer to layer.In the mid-18th century, the naturalist Mikhail Lomonosov suggested that Earth had been created separately from, and several hundred thousand years before, the rest of the universe. In 1779 the Comte du Buffon tried to obtain a value for the age of Earth using an experiment: He created a small globe that resembled Earth in composition and then measured its rate of cooling.
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igneous and metamorphic rocks with zircon, baddeleyite, perovskite, monazite, titanite, rutile, xenotime, pitchblende, thorite, and thorianite; whole rock carbonates; single-mineral grains from sediments Paul M. Olson - Emeritus Professor of Geology, Whitworth College, Spokane, Washington.
Coeditor of Proceedings of the Sixth International Conference on Radiocarbon and Tritium Dating.
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