The term 'historic time' can be broken down into three crossword solutions: ERA, EPOCH, and AGE. An ERA is a period of time marked by certain characteristics or events, such as the Stone AGE or the Industrial Revolution. An EPOCH is a longer period of time, usually lasting thousands or millions of years, such as the Jurassic EPOCH. An AGE is a period of time that is considered to have a particular quality or character, such as the Iron AGE. All three terms refer to a period of time in history that is significant and noteworthy.