Definitions for "Time scale"
The number of time units that pass per second in a time coordinate system. A time coordinate system that measures time in sixtieths of a second, for example, has a time scale of 60.
The division of geologic history into era, periods, and epoch accomplished through stratig-raphy and paleontology.
an arrangement of events used as a measure of duration; "on the geological time scale mankind has existed but for a brief moment"
A system of unambiguous ordering of events meant to be stable and homogeneous.
a system of assigning dates to events
Keywords:  subset, closed, reals
a closed subset of the reals)
Keywords:  model, run
The run time of a model.