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Tremadocian Stage
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A chart showing the Ordovician period within the Paleozoic era on the geologic time scale, listing its division into Lower, Middle, and Upper epochs, with corresponding stage names and their ages in millions of years ago. A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years.
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A chart showing the Ordovician period within the Paleozoic era on the geologic time scale, listing its division into Lower, Middle, and Upper epochs, with corresponding stage names and their ages in millions of years ago.
Ordovician System The Ordovician Period began 485.4 million years ago and ended 443.8 million years ago.

Tremadocian Stage

stratigraphy
Also known as: Tremadoc Series
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History

Tremadocian Stage, lowermost of the two standard worldwide divisions of the Lower Ordovician Series and lowest of the seven stages within the Ordovician System. It encompasses all rocks formed during the Tremadocian Age, which spanned the interval between 485.4 million and 477.7 million years ago. The name of this stage is derived from Tremadog, a town in North Wales; the characteristics of the stage are based on fossils found in the Tremadoc Slates. Although most...

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