Стратиграфия и микрофаунистическая характеристика тавдинской свиты Западной Сибири
Bibliographic record
Abstract
Over the course of many years, the Tavdinskaya suite has been studied in order to ascertain the lithology and stratigraphy of this part of the marine Palaeogene of Western Siberia. Numerous borehole sections have been studied in Transuralia and especially in the southern part of Western Siberia (southward the latitudinal flow of the Ob River). At that time the basin was connected with southern seas through the straights in Turgay and northern Urals. Since the beginning of the Oligocene, the northern part of Western Siberia and the whole Arctic Region were exposed to the upward tectonic movements. This resulted in the shallowing and separation of the West-Siberian and Canadian basins and widening of the straight between Greenland and Norway. As it has previously been stated [2], calcareous secreted foraminifers migrated to the West Siberian Basin from the Atlantic Ocean via the shallowed warmed Arctic Basin and farther through the straight in the northern Urals. This may be evidenced by the systematic composition of foraminifers wherein European and American species of benthos and planktonic forms are present. There are no similar foraminifers in the Eocene and Oligocene of Kazakhstan. The most characteristic distinguished planktonic forms are as follows: Paragloborotalia postcretacea (Mjatliuk), P. anguliofficinalis (Blow), Globanomalina micra (Cole), G. barbadoensis (Blow), Globigerina ouachitaensis Howe et Wallace gnaucki Blow et Banner, G. angustiumbilicata Bolli, G. ampliapertura Bolli, G. officinalis Subbotina praesentata Podobina. Besides the planktonic forms, the characteristic calcareous benthos species were encountered: Cibicidoides pseudoungerianus (Cushman), Nonionellina oligocenica (Cushman et McGlamery), N. оvata (Brotzen), Evolutononion decoratum (Cushman et McGlamery), E. advenum (Cushman) and elphidiids. The Early Oligocene foraminiferal assemblage of Western Siberia characterizes the Cibicidoides pseudoungerianus Protononion decoratum Zone occupying the most part of the section of the Tavdinskaya suite. One of the recently studied sections of this suite, wherein the Early Oligocene foraminifers were distinguished, is the borehole of Section 8 (depth 159.35-87.60 m) of the Russian-Polyanskaya Area southward Omsk on Kazakhstan borderline [2]. The systematic composition of foraminifers, the rate of their preservation and lithological characteristics of rocks are indicative of their dwelling in the shallow coastal southern part of the West Siberian basin. More comprehensive information on the systematic composition of the foraminiferal assemblages studied previously and their comparison with those of other regions, including the Rupelian typical section of Belgium, has been presented in other publications [1, 2]. In the Tavdinskaya suite, the underlying quartz-siliceous agglutinated species gave way to the predominating calcareous secreted forms. This is recorded by us both in the West Siberian Province and in the Canadian one, thus indicating the general change of physical-andgeographical and bionomical conditions in the whole Arctic area.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.025 | 0.009 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".