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In 1907, Bertram Boltwood published an article describing a novel, radiometric method for determining the age of minerals - a method he used to date a rock sample at more than 2 billion years: to search the CAS databases for additional information about radiometric dating and evolution.

If your organization is enabled to use the web version of Sci Finder, you can click the links in this article to directly access details of the cited references.

“It’s a nice example for evolution at work.” Before now, the oldest known baleen-whale fossil was 34 million years old.

But molecular and physical analyses indicated that whales were older than that.

Their method, a type of radiometric dating called uranium-lead (U-Pb) dating, relies on the fact that uranium isotopes radioactively decay to form lead isotopes.

By comparing the amount of each isotope in a sample, the age of the sample can be calculated.

Students "date" samples from the block diagram by counting the number of 235U and 207Pb atoms (colored beads) in a zircon (Ziploc bag).

Students should come up with the intended ages for their zircons and should be able to evaluate whether or not their relative age hypotheses are consistent with the numerical dates.

Some types of relative dating techniques include climate chronology, dendrochronology, ice core sampling, stratigraphy, and seriation. The creature, named Mystacodon selenensis, is the oldest baleen-whale relative yet found.The skeleton displays traits that place it firmly as the first baleen-whale relative known to emerge after an ancient group of whale ancestors called basilosaurids split into two: one branch led to the toothed whales, which include sperm whales (Physeter macrocephalus) and dolphins, and the other to baleen whales.Radiometric dating not only supports the geologic "evolution" of the Grand Canyon, it validates a central tenet in a much different theory of evolution - a theory introduced by Charles Robert Darwin in his 1859 publication, An important criticism of Darwin's theory of evolution was its requirement for "an almost infinite number of generations", when evidence at the time suggested earth was less than 100 million years old.Nearly 50 years after Darwin published , research on radioactive elements in rocks provided the first reliable evidence that the earth was old enough to accommodate the evolution of complex organisms.

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