Riphean (stage)
The Riphean is a stage or age of the geologic timescale from 1,600 to 650 million years ago. The name Riphean is used in the Proterozoic stratigraphy of Russia and the Fennoscandian Shield in Finland.[1] It was also used in a number of older international geologic timescales but, in the most recent timescales of the ICS, it is replaced by the Calymmian, Ectasian, Stenian, Tonian and Cryogenian periods of the Neoproterozoic and Mesoproterozoic eras.
| Riphean | |
|---|---|
| 1600 – 650 Ma | |
| Usage information | |
| Celestial body | Earth |
| Regional usage | Regional |
| Time scale(s) used | Siberian |
| Used by |  Russia |
| Definition | |
| Chronological unit | Age |
| Stratigraphic unit | Stage |
Geological cross-section of southern Siberia, showing Riphean rocks buried under at least 2 km of younger rocks
The word 'Riphean' comes from the ancient Riphean Mountains, sometimes identified with the Ural Mountains.
The Riphean has been divided by geologists into the Early Riphean (1600–1400 Ma), Middle Riphean (1400–1000 Ma) and Late Riphean (1000–650 Ma) subdivisions.[1][2]
See also
References
- Paulamäki, S. and Kuivamäki, A. (2006). Depositional History and Tectonic Regimes within and in the Margins of the Fennoscandian Shield During the Last 1300 Million Years (PDF). Posiva Oy.CS1 maint: multiple names: authors list (link)
- Rundqvist, D.V. and Mitrofanov, F.P. (editors) (1993). Precambrian Geology of the USSR. p. 181.CS1 maint: multiple names: authors list (link) CS1 maint: extra text: authors list (link)
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