Degradative Calcification of a Modern Siliceous Sponge from the Great Bahama Bank, The Bahamas: A Guide for Interpretation of Ancient Sponge-Bearing Limestones
Bibliographic record
Abstract
Abstract Organic colloids are involved in the early calcification of the modern siliceous sponge Spheciospongia vesparium (Lamarck, 1815) from the Great Bahama Bank. Electron microscopy and in situ fluorescence microspectometry studies indicate that colloids attached within or onto a collagen network promote the precipitation of aragonite crystals in these sponges. Calcification occurs within those portions of the sponge that are buried in the sediment, preferentially in regions of agglutinated sediment particles, with sponge connective tissue being subjected to necrosis and significant degradation of the extracellular collagen matrix. The dismantling of collagen bundles leads to collagen scaffolds, which act as a sorbent and have significant adhesive effects for ions and/or organic colloids. Bacteria and other microorganisms support tissue degradation, but neither act as a substrate for aragonite precipitation or are present in significant numbers at calcification sites. This process of early calcification may explain the origin of fossil calcified siliceous sponges ("sponge mummies" and "tuberoids") as well as the occurrence of patchy calcified sponge materials, thereby calling into question the commonly accepted idea that pelletoidal texture associated with these fossil sponges indicates that bacteria are directly responsible for the calcification.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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 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".