1. In an isochron dating plot, the Al / Mg ratio plotted is /. 2. If all data points lie on a straight line, this line is called an isochron . 3. The isochron ages of these sills and dikes and the Cardenas Basalt lavas are basically identical. 4. Dating is achieved usually by trying to produce an isochron of several minerals within a rock specimen. 5. Ferroan anorthosites have been dated using the internal isochron method at " circa " 4.4 Ga. 6. As illustrated in figure 1, this point defines the lower ( left ) end of the isochron . 7. To mitigate this effect it is usual to date several minerals in the same sample, to provide an isochron . 8. Together, these samples define an isochron , whose slope gives the age of meteorites as 4.55 Byr. 9. Lead isotope isochron diagram used by C . C . Patterson to determine the age of the Earth in 1956. 10. Plotting an isochron is used to solve the age equation graphically and calculate the age of the sample and the original composition.
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