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Lower Cretaceous
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THE HISTORY OF LAND PLANTS IN THE NORTHERN HEMISPHERE DURING THE TRIASSIC WITH SPECIAL REFERENCE TO THE FLORAS OF EURASIA
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THE HISTORY OF LAND PLANTS IN THE NORTHERN HEMISPHERE DURING THE TRIASSIC WITH SPECIAL REFERENCE TO THE FLORAS OF EURASIA
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I. A. Dobruskina
Triassic period is a period of reconstruction ("perestroyka") in the plant kingdom. During the Triassic Paleophytic plant assemblages gradually changed to Mesophytic ones. The greatest break in the plant life took place in the middle of the Triassic and "perestroyka" itself occurred during the late Permian and the first half of the Triassic, i.e. during about 60 millions of years. Late Permian and Lower Triassic stage of development of plants may be characterized as the last stage of the Paleophytic. Reconstruction continued during Ladinian-Karnian stage which may be considered as the first stage of Mesophytic. "Normal" Mesophytic begins from Norian (middle Mesophytic) and continues during the Jurassic and
Lower Cretaceous
(late Mesophytic). The reconstruction in floral composition was accompanied by the reconstruction of the paleogeographical zo- nation. The great isolation and f ractionality of the Paleozoic Phytochoria were replaced by more simple zona- tion, similar to the recent one. Zusammenfassung: Während der Trias erfuhr die Pflanzenwelt eine grundlegende Änderung. Die paläophy- tische Florenvergesellschaftung wurde von der mesophytischen abgelöst. Der stärkste Florenschnitt erfolgte in der Mitteltrias, wobei sich die Änderung in der Pflanzenwelt bereits während des Oberperms und der Untertri- as vollzog, d.h. während eines Zeitraums von ca. 60 Mill.J. Die oberpermische und untertriadische Entwicklungsstufe der Pflanzen kann als spätes Stadium des Paläo- phytikums charakterisiert werden. Der Umbau erfolgte während des Ladins und Karns, was als erstes Stadium des Mesophytikums aufgefaßt werden kann. Das eigentliche ("normale") Mesophytikum beginnt mit dem Nor (mittleres Mesophytikum) und setzt sich bis in den Jura und die Unterkreide (spätes Mesophytikum) fort. Die Änderung der Florenvergesellschaftung war begleitet von einer Änderung der paläogeographischen Zo- nierung. Die starke Isolation und Zonierung der paläozoischen Phytochoria wird von einer einfacheren Zonie- rung, ähnlich der heutigen, abgelöst.
Published in 1988.
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References
(3)
Triassic Conifers as the basis for stratigraphical correlation
(
Citations: 2
)
I DOBRUSKINA
Journal:
Geobios - GEOBIOS-LYON
, vol. 17, no. 6, pp. 861-863, 1984
Marine Triassic faunas of North America: Their significance for assessing plate and terrane movements
(
Citations: 36
)
E. T. Tozer
Published in 1982.
Das Phänomen Trias
(
Citations: 3
)
Rudolf Trümpy
Published in 1982.
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Citations
(1)
A review of selected triassic to Early Cretaceous ferns
(
Citations: 52
)
William D. Tidwell
,
Sidney R. Ash
Journal:
Journal of Plant Research - J PLANT RES
, vol. 107, no. 4, pp. 417-442, 1994