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The study of geologic time is encompassed within the larger subject of historical geology.The latter, the study of Earth's physical history, is one of the two principal branches of geology, the other being physical geology, or the study of Earth's physical components and the forces that have shaped them.The age of the fossil must be determined so it can be compared to other fossil species from the same time period.Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.For the most part, we will not be concerned with the chronostratigraphic terms in the present context.
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Several of these subjects are examined in essays within this book. The more well-known of these is the geologic scale, which divides time into named groupings according to six basic units: eon, era, period, epoch, age, and chron.