Daugava Stage
General info
Belongs to |
Baltic Upper Devonian
|
Type | chronostratigraphy |
Rank | Stage |
Scope | regional |
Status | formal standard |
Author | Liepinš |
Year | 1951 |
Etymon | Daugava river |
Age top (Ma) | 354 |
Age base (Ma) | 359 |
Age (Ma) |
Frasnian
|
Date changed | 2022-12-05 |
Stratigraphy | Index | Index add'l | Type | Rank | Scope | Belongs to | Age base (Ma) | Age top (Ma) | Age |
---|---|---|---|---|---|---|---|---|---|
Daugava Formation | D3DG |
lithostratigraphy
|
Formation
|
regional
| Baltic lithostratigraphy (Devonian) |
Daugava Stage
|
Description
by K. Kajak
Original text from: Raukas, A., Teedumäe, A. (eds). 1997. Geology and Mineral Resources of Estonia. Estonian Academy Publishers, Tallinn. 436 pp. ISBN 9985-50-185-3. Available online at: sarv.gi.ee/geology.
The Daugava Stage and the Daugava Formation have derived the name from the exposures on the banks of the Daugava River, Latvia (Liepinš 1951). In Estonia, the uppermost 8.5 m of the Devonian section in the Parmu borehole belong to the Daugava Stage (Fig. 90). In the borehole, the stage is represented by argillaceous micro- and cryptocrystalline limestones (CaO 49%, MgO 2%, insoluble residue 27%).
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