Tertiary and
Quaternary used to be considered the two periods of the
Cenozoic in their own right, but this is no longer formal. Some split the large Tertiary into the lower
Paleogene and established the
Neogene to include the last two epochs (
Miocene and
Pliocene) of the Tertiary. Some include both epochs of the Quaternary in the Neogene as well, while others consider the Quaternary to be the period after the Neogene. As of 2006 the disagreement remains. See
Neogene for details.
Pre-
Holocene is a broad and vague term for all time before the Holocene epoch today.
Precambrian originated as the vague term for all time before the
Cambrian period. As this time became better understood, the
Archean and
Proterozoic eons were established and the Precambrian elevated to a "supereon" before today's
Phanerozoic. However, "supereon" in terrestrial time refers almost exclusively to Precambrian time.
Subcategories
This category has the following 7 subcategories, out of 7 total.
Tertiary and
Quaternary used to be considered the two periods of the
Cenozoic in their own right, but this is no longer formal. Some split the large Tertiary into the lower
Paleogene and established the
Neogene to include the last two epochs (
Miocene and
Pliocene) of the Tertiary. Some include both epochs of the Quaternary in the Neogene as well, while others consider the Quaternary to be the period after the Neogene. As of 2006 the disagreement remains. See
Neogene for details.
Pre-
Holocene is a broad and vague term for all time before the Holocene epoch today.
Precambrian originated as the vague term for all time before the
Cambrian period. As this time became better understood, the
Archean and
Proterozoic eons were established and the Precambrian elevated to a "supereon" before today's
Phanerozoic. However, "supereon" in terrestrial time refers almost exclusively to Precambrian time.
Subcategories
This category has the following 7 subcategories, out of 7 total.