Late Quaternary patterns of retreat of the Laurentide Ice Sheet margin in Clyde Inlet, eastern Baffin Island (Arctic Canada)
Bibliographic record
Abstract
The maximal extent of the Laurentide Ice Sheet (LIS) on eastern Baffin Island has been widely debated during \nthe last decades as different palaeoglaciological models have been proposed, ranging from a single-domed ice \nsheet extending beyond the shelf break to an ice sheet margin barely reaching the head of the fjords. Spatial and \ntemporal variability of ice sheets extension on eastern Baffin Island during Quaternary glaciations complicate the \nestablishment of a reliable reconstruction of the ice margin. Furthermore, the lack of geophysical data in most of \nthe fjords, and seaward, makes it difficult to reconcile the proposed terrestrial and marine glacial margins at the \nLast Glacial Maximum (LGM). \nHere we use high-resolution swath bathymetry imagery combined with acoustic stratigraphy data collected \nduring various oceanographic expeditions of the RV Maria S. Merian, CCGS Amundsen and RV Nuliajuk to: (1) \ndefine the maximal extent of the LIS margin in Clyde Trough during the LGM; (2) reconstruct ice-flow variations \nand glacial dynamics while the ice retreated on the shelf and in Clyde Inlet; and (3) identify phases of stillstand \nand/or readvance during deglaciation of the sector. \nGeomorphological mapping of Clyde Inlet and its adjacent continental shelf allowed the identification of \nsubglacial landforms, such as crag-and-tails and mega-scale glacial lineations (MSGLs), which are indicators of \nfast-flowing ice (i.e. ice streams). The swath bathymetry imagery also allowed delineating four grounding-zone \nwedges (GZWs) in the trough, indicating positions of stability of LIS margins during the LGM and early \ndeglaciation. Several moraines observed in the fjord suggest that ice retreat occurred by steps in a less catastrophic \nway than previously proposed. The data show five different moraine systems in Clyde Inlet. Sediments cores \ncollected during the summer of 2017 will provide additional insight on the deglacial history and processes on \neastern Baffin Island.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".