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Development of the system was begun in the late 18th century, and the original divisions were Primary, Secondary, [[Tertiary]], and [[Quaternary]].
Development of the system was begun in the late 18th century, and the original divisions were Primary, Secondary, [[Tertiary]], and [[Quaternary]].
Later, dates were assigned to the divisions according to [[uniformatarianism (science)|uniformitarian]] beliefs about the age of the Earth, and the sections were further divided and subdivided.
Later, dates were assigned to the divisions according to [[uniformitarianism (science)|uniformitarian]] beliefs about the age of the Earth, and the sections were further divided and subdivided.
The system is now divided into [[eon (geology)|eons]], [[era (geology)|eras]], [[period (geology)|periods]], and [[epoch (geology)|series or epochs]].
The system is now divided into [[eon (geology)|eons]], [[era (geology)|eras]], [[period (geology)|periods]], and [[epoch (geology)|series or epochs]].