Sentence examples for radiometric from inspiring English sources

The decay of potassium-40 to form argon-40 (calcium-40 is produced in this decay process as well) is also a widely used radiometric dating tool, though there are several other parent-daughter pairs that are used in radiometric dating, including another isotope of uranium (uranium-235), which decays ultimately to form lead-207, and thorium-232, which decays to lead-208.

No radiometric date for it is available, but other dating methods estimate it to be about 1.5 million years old.

A series of radiometric determinations done subsequently has yielded a date of 1.88 mya.

The employment of radiometric dating techniques and pollen analyses in this region has provided an excellent chronology of Weichselian events.

In both cases the time dimension is added through radiometric methods applied to the same materials that show the reversals.

This indirect method compares accompanying animal fossils with those found in other African sites that have been dated more precisely using radiometric methods.

The success of dating Phanerozoic time with some degree of precision has depended on the interlinking of radiometric ages with biostratigraphy, which is the correlation of strata with fossils.

Besides being distinctive, a volcanic-ash layer has four other advantages for purposes of correlation: it was laid down in an instant of geologic time; it settles out over tremendous areas; it permits physical correlation between contrasting sedimentary environments; and unaltered mineral crystals that permit radiometric measurements of absolute age often are present.

One new and fundamental result has come from radiometric age dating of the samples.

The upper portions of the Belt Series grade into undoubted Cambrian rocks without apparent interruption, whereas the lower portions are at least 1.5 billion years old, as determined by radiometric-dating techniques.

Research in the Earth sciences has benefited greatly from the use of radiometric-dating techniques, which are based on the principle that a particular radioisotope (radioactive parent) in geologic material decays at a constant known rate to daughter isotopes.