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Titolo:
Jurassic ammonite faunas from Nepal and their bearing on the palaeobiogeography of the Himalayan belt
Autore:
Enay, R; Cariou, E;
Indirizzi:
Univ Lyon 1, Ctr Sci Terre, F-69622 Villeurbanne, France Univ Lyon 1 Villeurbanne France F-69622 re, F-69622 Villeurbanne, France Univ Poitiers, Geol Lab, F-86022 Poitiers, France Univ Poitiers PoitiersFrance F-86022 Geol Lab, F-86022 Poitiers, France
Titolo Testata:
JOURNAL OF ASIAN EARTH SCIENCES
fascicolo: 5-6, volume: 17, anno: 1999,
pagine: 829 - 848
SICI:
1367-9120(199910/12)17:5-6<829:JAFFNA>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEA-LEVEL CHANGES; INDO-SOUTHWEST PACIFIC; NEW-ZEALAND; KIMMERIDGIAN AMMONITES; SPITI SHALES; MIDDLE; BIOGEOGRAPHY; PALEOBIOGEOGRAPHY; PALEOCLIMATE; CIRCULATION;
Keywords:
ammonites; Jurassic; Himalayas; Nepal; palaeobiogeography; Indo Pacific; austral fauna;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
180
Recensione:
Indirizzi per estratti:
Indirizzo: Enay, R Univ Lyon 1, Ctr Sci Terre, 27-43 Bd 11 Novembre 1918, F-69622 Villeurbanne, France Univ Lyon 1 27-43 Bd 11 Novembre 1918 Villeurbanne France F-69622
Citazione:
R. Enay e E. Cariou, "Jurassic ammonite faunas from Nepal and their bearing on the palaeobiogeography of the Himalayan belt", J ASIAN E S, 17(5-6), 1999, pp. 829-848

Abstract

From the Upper Bathonian up to the Tithonian-Berriasian, six main faunas and twelve basic faunal assemblages within them are distinguished in Nepal. The successive faunas show (1) low taxonomic diversity and (2) the dominance of a small number of genera and the subordinate place of the associated taxa. The assemblages include: (1) strictly Tethyan (e.g., Mediterranean or European Tethyan) species and/or genera, very few in number and occurring as isolated individuals or discontinuous faunal horizons; (2) Indo-Malagasian components, some scattered, others with a wide occurrence in the SW Pacific, some as far as Antarctica and/or Patagonia; (3) indigenous genera endemic for the Himalayas and the SW Pacific region. Faunas of the same age for the Sula Islands, Papua-New Guinea, Australia, New Zealand, Antarctica and South America are also considered. In spite of common components, the Himalayan faunas contrast with the relatively higher diversity of the Indo-Malagasian faunas. Low diversify and dominance of indigenous genera mean that the faunas extending from the Himalayas to Antarctica and Patagonia represent an actual biogeographical unit, the Indo Pacific (faunas and) Realm. Indo Pacific and Tethyan faunas show a less marked contrast than the Tethyan and Boreal. Transitional or mixed faunas of subaustral type developed inthe Indo-Malagasian and Andean regions. This is explained by the absence of a geographical trap comparable to the land-locked palaeogeography of the Arctic Basin. The palaeogeography of the Arctic amplified the role of the other environmental factors. Among these the high latitude seasonal effects are likely to have resulted in environmental instability, controlling trophic resources and therefore the structure of the ecosystems, for instance low diversity and high density of the high latitude ammonite faunas. (C) 1999Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 17:44:10