Sedimentological and Ichnological Dynamics of the Early Cambrian Mount Clark Formation, Northwest Territories, Canada
Bibliographic record
Abstract
The early Cambrian Mount Clark Formation of the Northwest Territories comprises marginal marine to marine siliciclastic sediments deposited in an incipient rift basin on the margin of Laurentia. Within core and outcrop datasets the preserved record of sedimentation represents complex and highly variable lateral to vertical architecture. As a result of recording early Cambrian (Series 2, Stage 3: Bonnia-Olenellus trilobites) the Mount Clark Formation represents a rare opportunity to study marine biological interactions at the very onset of the Cambrian Explosion. To achieve this objective, high resolution sedimentological ichnological data was recorded from a six core database within the Colville Hills in addition to the field description of 8 outcrops in the Mackenzie Mountains over the course of two field seasons. Eight distinct lithofacies (F1-F8) were identified in the Colville Hills recording offshore to continental deposition along a strongly storm-influence shoreface succession. Three distinct facies associations (FA1-3) were identified within the Mackenzie Mountains recording shoreface (FA1), deltaic (FA2), and tidal embayment (FA3) sedimentation. Shoreface sedimentation (FA1) ranged from strongly storm-influenced to storm-affected lower shoreface to foreshore environments and were identified on the presence of robust and diverse trace fossil assemblages. Deltaic sedimentation (FA2) ranged from strongly storm-influenced to storm-affected prodelta to upper delta-front environments and were identified on the basis of stressed trace fossil assemblages recording decreasing ichnofossil size, diversity, and abundance in collaboration with more immature lithologies. Tidal compound dune sedimentation (FA3) ranged from embayment margin to the core of a compound dune field. Shoreface trace fossil assemblages within both study areas were found to have higher degrees of diversity, abundance, and complexity than previously identified early Cambrian trace fossil assemblages. It is interpreted that the Mount Clark Formation represents the earliest known radiation into these characteristic ethologies predating the famous and complex body fossils within the Burgess Shale. This body of work seeks to highlight a poorly understood region of Canada’s north, recording deposition at a time when complex life was first inhabiting Earth’s primordial oceans.
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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 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| 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".