Examining the Holocene Paleoenvironment of Okak Bay, Labrador, Canada using Microfossils and Sedimentary Indicators
Bibliographic record
Abstract
To elucidate how Holocene climatic and environmental conditions have changed in the eastern North Atlantic region, a sedimentological and palynological investigation has been carried out on sediment cores retrieved from Okak Harbor, Labrador, Canada. Okak is located along the Labrador coast, adjacent to the Labrador Sea, and contains both prehistoric and historic human settlement sites. The site is located proximal to the latitudinal tree limit, making the local conifer population vulnerable to even relatively small perturbations in climate. For these reasons, Okak is a desirable site to investigate Holocene paleoenvironmental change in the North Atlantic region. Results from this study illustrate that environmental conditions in the Okak region have undergone several changes in response to climate fluctuations through the late Holocene. Shrub-tundra conditions persisted in the early-mid Holocene, giving way to increasing conifer abundance as the tree limit migrated northward. Concurrent changes in magnetic susceptibility, grain size, and relative vegetation distribution suggest shifting climatic conditions ca.4200 cal BP, which roughly corresponds to the transition from the warm Holocene Thermal Maximum to the cooler Neoglacial conditions previously established for the Labrador area. Comparison of the Okak Harbor data set to GISP2 temperature, accumulation, and ion datasets aids in interpreting local environmental changes in the broader scheme of North Atlantic climate. While correlations can be made between the Okak and GISP2 records through the late Holocene, Okak sediments do not appear to reflect an expression of the 8200 year climatic event, which has been well documented across the North Atlantic region. Though it is difficult to decouple the paleoenvironmental signature of climate change and prehistoric human activities in the sedimentary record, high sedimentation rates and decreasing conifer abundance in the latest Holocene, in addition to ethnographic and archaeological records, suggest the intensive occupation of the Moravian mission site by both European and Labrador Inuit populations may have impacted the local environment.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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".