The tectonic evolution of Laurentia and the North American continent: New datasets, insights, and models
Bibliographic record
Abstract
ABSTRACT The North American continent has a rich geologic record that preserves evidence for tectonic processes throughout much of Earth’s history. Within this long history, however, particular times—e.g., “turning points”—have had specific and lasting impact on the evolution of Laurentia (ancestral North America). This volume is focused on seven of these “turning points”: (1) The Neoarchean (2.7–2.5 Ga), characterized by cratonization and the Kenoran orogen(s); (2) the Paleoproterozoic (1.9–1.7 Ga) and the initial assembly of Laurentia; (3) the Mesoproterozoic (1.5–1.4 Ga) Andean-style margin on the southern edge of Laurentia with the Pinware-Baraboo-Picuris orogeny; (4) the 1.2–1.0 Ga Midcontinent rift, and the Grenville orogeny and assembly of Rodinia; (5) the 700–500 Ma Neoproterozoic breakup of Rodinia; (6) the mid-Paleozoic (420–340 Ma) closure of the Iapetus and Rheic oceans and the development of the Appalachian-Caledonian orogen; and (7) the Jurassic–Paleogene (200–50 Ma) assembly of the North American Cordilleran margin by terrane accretion and subduction. The assembled chapters provide syntheses of current understanding of the geologic evolution of Laurentia and North America, as well as new hypotheses for testing. The inclusion of work from different geological time periods within a single volume provides continent-wide perspectives on the evolution of tectonic events and processes that acted on and within Laurentia.
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.003 | 0.005 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 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".