What is the epoch or time during which a deposit was made. The strata all over the earth, which were formed at the same time, are said to belong to the same geological horizon. Le Conte called?

horizon — (Geol.) The epoch or time during which a deposit was made. The strata all over the earth, which were formed at the same time, are said to belong to the same geological horizon. Le Conte. (Webster's 1913.)

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