Roanoke River lineament and other geomorphic anomalies in the Coastal Plain of northeastern North Carolina, USA: LiDAR evidence for late Quaternary tectonics
Bibliographic record
Abstract
LiDAR images of northeastern North Carolina in the southeastern USA revealed a ~60-km-long, E-W-oriented geomorphic lineament that crosses the northern side of the Albemarle embayment, herein named the Roanoke River lineament. It is defined by morphological changes along the Roanoke River valley northeast of Palmyra that are aligned with a gentle ~40-km-long, E-W-oriented, south-facing topographic scarp to the east and an angular stream bend to the west. Based on its oblique orientation relative to the regional ENE-WSW-oriented horizontal compressive stress field, SHmax, and the style of geomorphic anomalies that define the lineament, we interpret the Roanoke River lineament to be the surface expression of a buried sinistral strike-slip fault zone, named herein the Roanoke River fault zone. This proposed fault zone may have formed to accommodate the dilatational change in volume produced by dextral motion across the ~10-km-wide Tar River right-step releasing offset in the dextral East Coast strike-slip fault system (ECFS) beneath the Atlantic Coastal Plain. North of the Roanoke River lineament is the ~55-km-long, WNW-ESE-oriented Corduroy Swamp lineament that coincides with the western Norfolk arch. Based on its oblique orientation relative to SHmax and the geomorphic evidence for uplift along the lineament, we postulate that it is the surface expression of a buried transpressional sinistral strike-slip fault, herein named the Corduroy Swamp fault. The existence of these and other faults interpreted herein could have major implications for the tectonic development of the Albemarle embayment and Norfolk arch along the U.S. Atlantic continental margin.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 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".