Burrowed Stiffgrounds on Estuarine Point Bars
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Abstract Allostratigraphic studies based on the examination of outcrop and core have benefited greatly from the application of substrate-specific ichnofacies. The Glossifungites Ichnofacies, in particular, has been widely employed in the recognition of stratigraphic bounding surfaces within Cretaceous deposits of the Western Canada Sedimentary Basin. Glossifungites Ichnofacies-demarcated surfaces are not limited to erosional discontinuities of allocyclic origin, however. Two examples of the recurring development of the Glossifungites Ichnofacies within accretionary bank deposits of marginal-marine settings, one modern and one ancient, are presented and discussed. Tidal point bars along the Shepody River of southern New Brunswick are dominated by the accumulation of fine-grained sediment in a macrotidal regime. Depositional surfaces are generally bioturbated and incipient trace fossils can be observed in underlying layers. Bioturbation of the silty mud occurs seasonally, emphasizing the heterolithic fabric. The upper 5-20 cm of the substrate is soft to fluid, and overlies comparatively stiff, but not fully compacted mud (i.e., stiffground). The firmer sediment readily supports open and unlined burrows, whereas burrows in the soft surficial layer are maintained only with mucous linings. Analogous Glossifungites Ichnofacies-demarcated stiffground surfaces have been observed within heterolithic, mudstone-dominated accretionary bank deposits of the Aptian McMurray Formation in northeast Alberta. A distinct trace fossil suite subtends from the tops of many mudstone beds, with burrow fills consisting of silt and very fine-grained sand sourced from the overlying bed. While a veneer of soft sediment may have been present above the cohesive mud at the time of burrowing, little record of such is preserved. Seasonal variations in estuarine water circulation and sediment texture are inferred to have led to the generation and exposure of the stiff substrate. These stiffground surfaces differ greatly in (paleo)environmental setting and stratigraphic occurrence from firmgrounds developed along omission surfaces. As a result, it is important to be able to differentiate between stiffground and firmground occurrences when assessing the significance of a Glossifungites Ichnofacies-demarcated surface. Firmgrounds show evidence for significant erosion along, and/or facies dislocation across, the burrowed surface. This implies that a significant shift in depositional setting has taken place between pre- and post-firmground conditions. Stiffgrounds, conversely, show evidence for only minor erosion, and they may be common within continuous sediment packages. Additionally, significant post-colonial compaction takes place with stiffgrounds, as the surface is developed along a substrate that has been subject to only minor compaction prior to exposure.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.009 | 0.001 |
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 it