HALYSIS HØEG, 1932 IN ORDOVICIAN CARBONATE MOUNDS, TARIM BASIN, NW CHINA
Bibliographic record
Abstract
Abstract The calcareous microproblematicum HalysisHøeg 1932 occurs in abundance in Ordovician fine-grained, reddish carbonate mounds rich in spar-cemented cavities (Katian, Tarim Basin, NW China). Morphological analysis of Halysis suggests a U-shape skeleton punctually attached to a soft substrate of carbonate sand and silt. The skeletons have a maximum width of 12 mm and consist of laterally branching tubes. The tubes display circular to laterally flattened outlines with a mean diameter ∼ 125 μm. The tube walls consist of an inner and an outer layer of microcrystalline calcite, and a central layer of imbricated, radially arranged calcite tablets. An affinity of Halysis with extant siphonous calcareous green algae (Bryopsidales, Udoteaceae) is likely. If correct, Halysis represents a case of a green alga that acquired its skeleton de novo in accordance with sea-water chemistry (low genetic control, low-magnesium calcite, Ordovician calcite sea). Halysis carbonate mounds are low-relief, internally bedded, shallow-water packstone to grainstone banks. Spar-cemented cavities are Halysis-supported shelter cavities (∼ 90%) and depositional cavities (∼ 10%) produced from sediment-laden flows. The mounds formed as part of a shallow-subtidal carbonate ramp dominated by algal-pellet sand sheets. Autocyclic drivers (sand propagation via tides, storms) produced increments of sediment burial followed by episodes of omission and algal growth. These mounds should not be mistaken for “shallow-water carbonate mudmounds” nor for algal framework reefs. In terms of facies, texture, biostratinomy and primary porosity, these mounds are considered a miniature version of bryozoan-rich carbonate banks. Twisted and imbricated aggregates of fronds of Halysis produced shelter cavities making up ∼ 5% of the total mound rock volume, thereby reducing accommodation space in sufficient quantity to explain mound formation. A review shows that Halysis presented herein displays the largest and most robust intrageneric growth form compared to occurrences of more basinal settings (Ordovician) as well as much younger carbonate deposits (Silurian to Devonian).
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.
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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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 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".