MEIOFAUNAL BIOTURBATION OF LATE PLEISTOCENE–HOLOCENE GLACIOMARINE MUD IN THE CHAMPLAIN SEA BASIN, EASTERN CANADA: ORIGIN OF BURROWS, THEIR GEOCHEMICAL IMPLICATIONS, AND PALEOENVIRONMENTAL CONTROLS
Bibliographic record
Abstract
Abstract Meiofaunal traces in cored Pleistocene to Holocene silt-clay glaciogenic rhythmites consist of four types: clay-rich fill (type A) representing feeding structures, and a silt-rich fill with a clay-rich lining (type B) representing dwelling structures. A third burrow type (type C) is filled with framboidal pyrite suggestive of microbially mediated early diagenesis under anoxic and circumneutral pH conditions. A variant of type C is filled with framboidal pyrite overgrown by poorly crystalline pyrite indicating at least two stages of iron sulphide growth within earlier formed burrows. Higher in the cored succession a bed thickness increase to about ∼ 14 cm is marked by an absence of meiofaunal traces. Since each bed represents deposition during a single year, it suggests that sustained sedimentation rates of ∼ 14 cm yr−1 represents a threshold for endobenthic activity. A fourth burrow type (type D) is filled mostly with clay and a lining with a distinctive parallel-aligned fabric of clay and dispersed silt grains, which occurs in slump blocks resedimented downslope from a shallower water setting. The absence of type A, B, or C burrows in these silt-rich slump blocks suggests that prior to slope failure, the silt-rich sediment substrate, and likely brackish pore fluid conditions, were not conducive to these tracemakers and/or trace-making behaviors. These differences illustrate the first-order control of physico-chemical factors, specifically, sedimentation rate, salinity, and substrate composition on the behavior of burrowing meiofauna in a glaciomarine basin plus the significance of meiobenthic activity on controlling early, shallow burial diagenesis.
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".