1. a line or curve on a map or diagram connecting points of equal time, especially in geology or geochronology
Usage: technical; geology; geochronology
2. in radiometric dating, a line on a graph representing samples of the same age
Usage: technical; geology; radiometric dating

Examples

• Geologists used isochron analysis to determine the age of the rock samples.
• The isochron method relies on plotting isotope ratios to establish a precise age.
• An isochron on the map showed all locations that experienced the earthquake at the same moment.
• The radiometric isochron provided strong evidence for the formation date of the mineral.
• By examining the isochron data, researchers could correlate the ages of different geological layers.