GENERAL GEOLOGY

Detailed explanation-1: -Period: This is the basic unit of geologic time. Epoch: This is the smallest unit of geologic time. An Epoch lasts several million years. Age: This is a measurement of time which describes an event, such as an Ice Age. EON. ERA. Holocene. 0.01-0. More items

Detailed explanation-2: -An epoch is the smallest unit of time on the scale, but still encompasses a period of millions of years. Chronologically, epochs are grouped together into larger units called periods. Periods are combined to make a subdivision called an era. An eon is the largest division of geological time.

Detailed explanation-3: -The geologic history of the Earth is broken up into hierarchical chunks of time. From largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

Detailed explanation-4: -Epochs and Ages Periods of geological time are subdivided into epochs. In turn, epochs are divided into even narrower units of time called ages. For the sake of simplicity, only the epochs of the Paleogene, Neogene, and Quaternary periods are shown on the time scale at the top of this page.

Detailed explanation-5: -Precambrian Era, Paleozoic Era, Mesozoic Era, and Cenozoic Era are the order of the four eras from longest to shortest duration.