Interpretation of Bedrock Topography within the Port Jackson (Sydney Harbour) Region using Marine Seismic Reflection
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Bibliographic record
Abstract
An interpretation of the bedrock topography of virtually the whole of Sydney Harbour has been undertaken to estimate the bedrock configuration, identify paleochannels, and determine the nature and thickness of overlying sediment layers. The interpretations are based on an extensive series of marine seismic reflection data recorded in 1975 covering the harbour entrance and tributaries, and data recorded in August 2000 covering the harbour entrance and adjacent areas.Sydney Harbour has a bedrock configuration defined as a meandering channel that follows a generally deepening path as it reaches the harbour entrance with the bedrock configuration deepening to 85 m below sea level (b.s.l.) at the harbour entrance. Within the harbour, the paleochannel maintains a depth of about 30-40 m b.s.l. in the southern region near Point Piper and in Middle Harbour, and a depth of about 40-70 m b.s.l. in the middle region around the Sow and Pigs reef. In the northern survey area, paleochannel depths of 40-50 m b.s.l. were found in the Manly region. In Parramatta River, bedrock depths occur between 20-30 m b.s.l. in upstream sections of the channel and 40-45 m b.s.l. in downstream sections of the channel. In Lane Cove River, the depth of the paleochannel extends to 20-35 m b.s.l.Meandering paleochannels occur throughout Sydney Harbour with tributary paleochannels clearly defined. Sydney Harbour sediments interpreted as Holocene marine sand were found to be thickest (65 m) near the harbour entrance. Average estimated sediment thicknesses were 17.4, 10.8, 14.3 and 13.6 m in Port Jackson, Parramatta River, Middle Harbour and Lane Cove River respectively.
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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) | 0.000 | 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 it