By V. Krassilov, Z. Lewy, Eviatar Nevo
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Extra resources for Late Cretaceous (Turonian) Flora of Southern Negev, Israel
This transported material scarcely reached the Dewalquea zone, thereby indicating that palm zone occurred at the back of the tidal-flat vegetation. 37 PLANT COMMUNITIES I t follows from the above taphonomic analysis of the plant-bearing sequences that both Gerofit and Qetura localities represent coastal wetlands with a subordinate and variable inland contribution. Plant remains are preserved in the marginal zone of a water body that evolved from brackish to hypersaline. Both lateral and vertical changes of fossil plant assemblages might have been primarily taphonomic, inflicted by the rapidly changing depositional landscape.
2001; Schweitzer et al, 2003) in association with Weichselia. However, neither Weichselia, nor Piazopteris, which remains are often associated, possessed the morphological adaptations typical of modern mangroves. Developmental adaptations to mangrove habitats, such as vivipary, are known only in angiosperms. Therefore, if intertidal arboreal vegetation existed before angiosperms, which is highly probable, it must have been ecologically different from modern mangroves. Some pre-adapted angiosperms penetrating such communities, in particular the Weichselia-type communities, might have evolved into the moderntype mangroves, but factual evidence is as yet not enough for substantiating the hypothesis.
1 – 8). Pseudanthia and dispersed follicles Eocercidanthus bracteatus and seeds Eocercidispermum campylum most probably belong to Eocercidiphyllites plant. In Gerocladus foliosus, fruits are preserved attached to the leafy shoots. The other flower/fruit remains, including Negevirea paniculata, a rare type of large infructescences, although not found in organic connection, might have belonged to the same plants as the dominant leaf remains. Aquatic/semiaquatic plants are poorly represented in this horizon, and the characteristic flabellate leaf sheaths of Qeturea fimbriata are few and fragmentary.