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/ And in Journal of Creation, 2010, a letter by Gary Loechelt and response by Russell Humphreys; both include references to earlier papers.
• RATE-Project Claims [about Helium in Zircons] by Rodney Whitefield Radiocarbon Decay (trace amounts of C-14 radiation) • RATE's Radiocarbon: Intrinsic or Contamination?
...igneous activity (both extrusive and intrusive) occurred in the Caledonian mountain belt, which stretched from New England, Nova Scotia, Newfoundland, Scotland, and Scandinavia to eastern Greenland.
Radiometric dating of granitic intrusions associated with the Caledonian orogeny yields ages between about 430 million and 380 million years.
You can explore educational web-resources that explain the principles of radiometric dating in the homepage for AGE OF THE EARTH — SCIENCE where you'll see different perspectives (conventional and young-earth) on the reliability of scientific conclusions about the earth's age.
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.
This led him to estimate that Earth was about 75,000 years old.
material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.
Following the development of radiometric age-dating in the early 20th century, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old.