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So, though they are in different geographic sites, there is certainty about their age-equivalence.
Fossil faunal and floral assemblages, marine and terrestrial, make for distinctive marker horizons.
By measuring the amount of radioactive decay of a radioactive isotope with a known half-life, geologists can establish the absolute age of the parent material.
A number of radioactive isotopes are used for this purpose, and depending on the rate of decay, are used for dating different geological periods.
Lord Rayleigh's method for the isolation of argon, based on an experiment of Henry Cavendish's.
The gases are contained in a test-tube (A) standing over a large quantity of weak alkali (B), and the current is conveyed in wires insulated by U-shaped glass tubes (CC) passing through the liquid and round the mouth of the test-tube.
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Luminescence dating techniques use 'light' emitted from materials such as quartz, diamond, feldspar, and calcite.
Many types of luminescence techniques are used in geology and in archaeology.
Argon is also used in incandescent, fluorescent lighting, and other gas-discharge tubes. Although argon is a noble gas, it can form some compounds under extreme conditions.
Argon fluorohydride (HAr F), a compound of argon with fluorine and hydrogen that is stable below 17 K (−256.1 °C; −429.1 °F), has been demonstrated.
The inner platinum ends (DD) of the wire receive a current from a battery of five Grove cells and a Ruhmkorff coil of medium size.