Lower Cretaceous conifer drift wood from Sverdrup Basin, Canadian Arctic Archipelago
Bibliographic record
Abstract
A small collection of calcified drift wood from Lower Cretaceous (Valanginium) sediments in the high northern latitude (>70°N) arctic Canada was anatomically examinded. The woods provide evidence of conifer-dominated forests that extended across the northern polar regions during greenhouse periods. Four specimens are assignable to Protopiceoxylon Gothan, two to Dacrydioxylon Greguss, and one to Coniferophyta indet. This paper documents the first xylem record of a fossil wood from the family Podocarpaceae, morphogenus Dacrydioxylon, in the Northern Hemisphere at high latitudes. Modern Dacrydium representatives thrive in areas close to the equator or in the Southern Hemisphere. The drift wood sampels were collected in 1974 by Edwin Kemper of Hannover (Germany). A special feature of the Canadian Valanginium sediments are unusual crystal aggregates in dark marine shales, so-called glendonites. These glendonites indicate low water temperatures and special climatic conditions during the polar marin sedimentation.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.003 |
| Open science | 0.003 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.015 | 0.001 |
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; both teacher heads agree on what is shown here.
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".