Cretaceous Environments of Asia by Hakuyu Okada and Nlall J. Mateer (Eds.)

By Hakuyu Okada and Nlall J. Mateer (Eds.)

This booklet offers a synthesis of the imperative environmental features of the Cretaceous in East and South Asia. The examine used to be comprehensive lower than IGCP venture 350, which bargains with the organic, climatological and actual environments of this sector through the Cretaceous. This synthesis discusses facets of stratigraphy, sedimentology, paleontology, geochemistry, tectonics, petrology, mineralogy, and geophysics. The examine effects are summarised via state, and contain a ways East Russia, Mongolia, jap China, Korea, Japan, Philippines, Vietnam, Laos, Cambodia, Thailand, and India. even supposing those nations don't surround the complete quarter, this insurance presents a superb standpoint of the evolution of the quarter in the course of the Cretaceous. The documents included during this ebook current a wealth of marine and nonmarine info on weather, biotic variety, circulate and chemistry of the sea in addition to basic plume tectonism. The latter appears to be like to have prompted a lot of the environmental swap during this extensive zone, together with either an greater greenhouse influence and excessive sea degrees.

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Thus, a cardinal reconstruction of gymnosperms occurred at the Gomorechensky/Rarytkin boundary. Typically Late Cretaceous dominants were replaced by the Paleogene ones, and the last mesophyte relicts disappeared. As for the angiosperms, the level of the tumover at that boundary did not exceed that of the previous Late Cretaceous stages, which occurred in the Northeast. More considerable changes in the angiosperms occurred in the late Paleocene, during which the evolutionary rate of the angiosperms increased and representatives of the modem genera from the families Ulmaceae, Betulaceae, Juglandaceae, Fagaceae, and Platanaceae began to have a major part in the flora.

Paleobotanic data indicate a deterioration of the climate in the East Siberian province by the end of the Cretaceous. The thermophile subtropical flora gave way to moderately thermophile deciduous plants. The early Maastrichtian warm climate became temperate in the midMaastrichtian. Dramatic changes in the taxonomic composition of palynoflora occurred in the upper Maastrichtian, and the floral composition resembled the Tertiary Arctic flora. The changes in palynomorph composition throughout the Maastrichtian conforms with the common ideas of cooling by the end of the Cretaceous.

Lobifolia, Kolymella raevskii, Cladophlebis grandis, CI. tchaunensis^ CI. Tchuktchorum, new species Ctenis, Elatocladus zheltovskii, Araucarites subacutensis, and Trochodendroides microphylla, and the combination of ancient (Coniopteris, Birisia, Arctopteris, Ctenis, Heilungia. Ginkgo, Phoenicopsis, and Sphenobaiera) and young elements (Taxites, Sequoia, Metasequoia, Menispermites, and Quereuxia angulata. Almost all indicative localities of the Chaun flora include Tchaunia and Ctenis. No other older Cretaceous flora of Northeastern Asia contains the same amount of cycadophytes (some new species of the genus Ctenis and Heilungia).

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