: This point typically represents the original age of crystallization for the minerals. It indicates when the isotopic clock first started ticking.
: Grains that do not plot exactly on the Concordia curve are called "discordant". The degree of discordance can vary based on the intensity of the heating or fluid access that caused the disturbance. Discordia atomica
A "proper guide" to interpreting a Discordia line involves understanding its two key intersections with the (the mathematically determined line where the age equals the Key Intercepts : This point typically represents the original age
: Scientists use mathematical approaches like the "York" or "Ludwig" methods to perform a linear regression of measurements to define the Discordia line. Discordia atomica