Notice bibliographique
Résumé
In the Early Cretaceous,there existed three phytogeographical regions in China,namely the North China,South China and southern Tibet regions.The North China Phytogeographical Region,which belongs to Vakhrameev'sSiberian Canadian Phytogeographical Region,developed three floras,including the Jehol,Fuxin and Dalazi floras in ascending order.The Jehol flora,which occurs in the Yixian Formation and the Jiufotang Formation of western Liaoning and contemporaneous strata in other areas,is dominated by Cycadopsida and Coniferopsida.It is regared as early Early Cretaceous in age.The Fuxin flora,characterized by the dominanca of the Filicopsida,Ginkgopsida and Coniferopsida,with abundant Cycadopsida and Equisetales,occurs in the Shahai Formation and the Fuxin Formation of western Liaoning and other equivalent strata.The Filicopsida is represented by abundant Dicksoniaceae,Osmundaceae,Schizaeaceae and monolete spore elements in the flora.This flora can be subdivided into three assemblages,which are in ascending order the Acanthopteris-Ginkgo coriacea assemblage,Ruffordia goepperti-Dryopterites assemblage and Ctenis lyrata-Chilinia assemblage.These three assemblages occur,respectively,in the Shahai Formation,and the lower-middle and upper parts of the Fuxin Formation in western Liaoning Province.The Dalazi flora from the Dalazi Formation of the Yanji basin of Jilin Province and the Quantou Formation of the Songliao basin,northeastern China,is characterized by the dominance of angiosperms and abundant scale-like or awl-shaped leaf conifers including Pseudofrenelopsis,Frenelopsis and Suturovagina of the Cheirolepidiacae and the form genera Brachyphyllum and Pagiophyllumm.The South China Phytogeographical Region belongs to Vakhrameev's Euro-Sinian Phytogeographical Region,with the dominance of Cycadopsida,scale-like or awl-shaped leaf conifers,small and thick pinnule ferns(mainly Cladophlebis),and the absence of Ginkgopsida,dicksoniaceous and monolete spore ferns.It represents tropical-subtropical floras,and can be divided into three sub-regions,namely the Eastern sub-region,the North Tibet sub-region and the Center sub-region.The Eastern sub-region,near the ancient Pacific Ocean,is typically represented by plants from Zhejiang and Fujian Provinces and the Laiyang basin of Shandong Province,where the scale-like or awl-shaped leaf conifers and Ptilophyllum of Bennettitales dominated,and schizaeaceous fern Ruffordia commonly occurs.The schizaeaceous fern Klukia and gleicheniaceous fern Gleichenites appear but are not very abundant in the flora.The Early Cretaceous flora of this sub-region can be divided into 3 or 4 assemblages,in ascending order,the Cupressinocladus-Pagiophyllum assemblage,Cladophlebis-Ptilophyllum assemblage,Ruffordia-Zamiophyllum assemblage and Suturovagina-Frenelopsis assemblage.The flora of the Tibet sub-region shares the main characteristics with the Eastern sub-region,but the ferns are more abundant,particularly rich in Klukia and Gleichenites,and with the occurrence of Scleropteris(a schizaeaceous fern) and some matoniaceaous ferns;gymnosperms are rich in Cycadopsida and relatively poor in Coniferopsida.The flora of the North Tibet sub-region could be further subdivided into two assemblages.The Center sub-region between the two sub-regions discussed above is characterized by poorly-developed floras in arid environments.The flora consists of a low diversity of species and low abundance of fossils,and is dominated by scaly or awl-shaped leaf conifers.The southern Tibet phytogeographical region,where fossils,including araucariaceous conifers and the seed fern Pachypteris specifica,have just been reported in the Himalaya area,belongs to the Austral Phytogeographical Region of Vakhrameev(1991).The Late Cretaceous floras hitherto have only been found from a few horizons of some localities scattered in Northeast China,South China and Tibet.It can not be divided into phytogeographical regions or into assemblages due to the lack of sufficient data.Principally based on plant fossils and the intergration of biostratigraphical and other chionostratigraphic data,the correlations of the Cretaceous plant fossil-bearing strata and the relevant strata in different phytogeographical regions of China have been established in the present paper.
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 ».