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The time span of the Paleogene period was 66 million years to 23 million years ago, while it's duration was approx. 42.97 million years.

The time span of Siderian period was 2,500 million years to 2,300 million years ago, while it's duration was approx. 200 million years.

The time span of Rhyacian period was 2,300 million years to 2,050 million years ago, while it's duration was approx. 250 million years.

The time span of Orosirian period was 2,050 million years to 1,800 million years ago, while it's duration was approx. 250 million years.

The time span of Statherian period was 1,800 million years to 1,600 million years ago, while it's duration was approx. 200 million years.

The time span of Calymmian period was 1,600 million years to 1,400 million years ago, while it's duration was approx. 200 million years.

The time span of Ectasian period was 1,400 million years to 1,200 million years ago, while it's duration was approx. 200 million years.

The time span of Stenian period was 1,200 million years to 1,000 million years ago, while it's duration was approx. 200 million years.

The time span of Tonian period was 1,000 million years to 720 million years ago, while it's duration was approx. 280 million years.

The time span of Cryogenian period was 720 million years to 635 million years ago, while it's duration was approx. 85 million years.