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 |
| ID | Sample No. | Locality | Depth / thickness (m) | Stratigraphy | Collector | Date collected | Image |
|---|---|---|---|---|---|---|---|
| 72666 | 72666 | Sukhlovo outcrop, Novgorod District | Daugava Stage | 1962-07-12 | |||
| 72665 | 72665 | Porkhov quarry, Pskov Oblast | Daugava Stage | 1962-07-12 | |||
| 72664 | 72664 | Porkhov quarry, Pskov Oblast | Daugava Stage | 1962-07-12 | |||
| 72663 | 72663 | Porkhov quarry, Pskov Oblast | Daugava Stage | 1962-07-12 | |||
| 72648 | 72648 | Ivakino outcrop, Pskov Oblast | Daugava Stage | Nestor, Heldur |
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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