Subtidal Ichnology of a Modern Tidal - Fluvial Transition Zone: Ogeechee Estuary, Georgia, U.S.A.
Bibliographic record
Abstract
Summary The vast contrast between the freshwater reaches of estuaries, characterized by low ichnological diversity, and estuarine mouths, which display ichnological suites comparable to diverse, fully marine environments, has been observed in the Ogeechee Estuary, GA, USA. This ichnological gradation in the tidal – fluvial transition zone can be very useful in paleoenvironmental reconstructions, as well as a useful analogue for oil and gas exploration and reservoir development. The Ogeechee River Estuary has been revisited to study the subtidal deposits of the tidal – fluvial transition zone in detail, as the subtidal has the greatest preservation potential. Modern subtidal sediments were sampled in July 2007 using a ship-operated Senckenberg box corer. The steel sample boxes used were 55 cm wide, 30 cm deep, and penetrated up to 70 cm. The cores were xradiographed and then impregnated with resin to produce sediment resin peels. These subtidal cores have been used to characterize the subtidal ichnological progression of the estuary. The outer estuary comprises fine – grained sand and may include shelly material. Abundance of burrows is low, but diversity is high. Burrows of shrimp (making traces similar to Thalassinoides) and bioturbation by brittle stars are common. The middle estuary is relatively coarser grained and also displays a diverse assortment of burrowers. Many worm burrows are present, making traces similar to Skolithos, Palaeophycus, and Planolites, as well as a great deal of reworking due to cryptic bioturbation. The upper estuary displays more riverine influence, with low diversity and higher abundances. Sands are coarser grained and cut by long vertical worm burrows, similar to Skolithos.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| 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".