TAPHONOMIC FILTERING IN ORDOVICIAN BRYOZOAN CARBONATE MOUNDS, TRENTON GROUP, MONTMORENCY FALLS, QUEBEC, CANADA
Bibliographic record
Abstract
Abstract Late Ordovician bryozoan carbonate mounds are present in the upper part of the Deschambault Formation (Trenton Group) at the Montmorency Falls locality, northeast of Quebec City. These mounds are local features within a stratigraphic interval otherwise characterized by a bedded sequence of bryozoan-rich deposits. From the core of the mound to its margins and into the well-bedded off-mound sediments, there is a taphonomic gradient in terms of preservation, automicrite formation, fragmentation, transport, growth versus shelter porosity, and marine cementation. By ruling out both local seepage of nonmarine fluids (nonspecialist fauna, normal-marine carbon and oxygen stable isotopes, near PAAS rare earth element distribution patterns) and differential growth rate (bryozoan zooecium size), mound formation is explained by a positive taphonomic feedback mechanism. Centimeter-size patches of automicrite in mound cores are considered crucial in explaining subtle variations of microtexture, microfacies, and subsequent mound formation. Automicrite (M1) is dark gray, contains microbioclasts, has sharply defined, scalloped outer margins, is commonly gravity defying, and occasionally joins up to bridge multiple bryozoan skeletons. Clusters of microtubules are present within M1 and a first generation of infiltrated microcrystalline carbonate sediment (M2). The size, geometry, and arrangement of these microtubules suggest an origin either from the attachment of nonspicular, keratosan sponges, or from the assimilatory action of marine fungi (so-called Wedl tunnels). In conclusion, a subtle and small-scale secondary reinforcement of bryozoan skeletons by cryptobiontic ephemeral substrates is critical for the development of mounds out of an essentially level-bottom bryozoan community.
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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) | 0.001 | 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 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".