What is the smallest unit of geologic time? A. Era B. Epoch C. Eon D. Period
The smallest unit of geologic time is epoch.
The most appropriate answer is b. Epoch. An epoch is a unit of geologic time that is smaller than a period. The largest divisions are called eras. Eras are then divided into periods. Examples of epochs include the Holocene, Eocene and Miocene. We are presently in the Holocene Epoch.