Independent corroboration of a previously proposed Palaeozoic link between eastern Australia and eastern North America
Notice bibliographique
Résumé
A new finding by Ebach & Humphries (2002) published in the Journal of Biogeography and reported in Science (Holden, 2002) amounts to independent corroboration of my earlier proposal (Dobson, 1992, 1996) that eastern Australia may have collided with eastern North America in the Paleozoic. They conclude, based on cladistic analysis of Lower Devonian trilobites, ‘New South Wales … has a closer association to the Appalachian province than it does to Victoria. The areas may be adjusted by aligning the palaeolongitude of Laurentia so it is closer to the eastern Australian coastline.’ In the mid-1990s, I tested the hypothesis that Australia and eastern North America met in rotational collision during the Palaeozoic with the corollary that the New England fold belt of Australia, rather than the Reguibat promontory of Africa, collided with the Alleghanian orogen in the central Appalachians (Dobson, 1996). Substantial corroborating evidence was presented in this journal: Identical Lancefieldian stage, zone 1 (Early Ordovician) graptolites of the Anisograptid family are found in identical environments in Newfoundland, Norway, and the Lachlan fold belt of Australia. Paleozoic granites are consistent with a tectonic model in which the Lachlan fold belt caused mechanical deformation of the Canadian Appalachians. The Lachlan and New England fold belts of Australia and the Alleghanian orogen of North America are tectonically consistent with this east coast hypothesis. Major deformations and magmatic episodes are coeval from Silurian to Permian. I concluded, ‘The tectonic, paleontologic, lithologic, and geometric evidence for this position is more abundant and precise than the stratigraphic evidence for a west coast location of Australia relative to North America.’ According to Holden (2002), ‘Ebach and Humphries…say that trilobites living in what is now the southern and central United States were more like ones from eastern Australia than those in Africa or South America. This suggests that accepted maps of the ancient landmasses of Gondwana (covering South America, Africa and Australia) and Laurentia (which included North America) are way off. ‘‘They moved right around the world 8000 kilometers west of where scientists originally placed them,’’ Ebach says.’ So far, so good, but there is a troubling contradiction in the interpretations offered by Ebach and Humphries. Their statement (p. 437) matches their cladistic diagram (Fig. 10, p. 438), but their map (Fig. 11b, p. 439) does not. The text and cladistic diagram fully support my east coast hypothesis, but their map inexplicably asserts a west coast hypothesis. Only they can explain the discrepancy.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».