By James R. Ehleringer, Thure Cerling, M. Denise Dearing
Dependent in broad examine in geology, atmospheric technological know-how, and paleontology, this ebook bargains a close background of CO2 within the surroundings, and an realizing of things that experience motivated adjustments long ago. The textual content illuminates the position of atmospheric CO2 within the sleek carbon cycle and within the evolution of vegetation and animals, and addresses the long run function of atmospheric CO2 and its most probably results on ecosystems.
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Extra resources for A History of Atmospheric CO2 and Its Effects on Plants, Animals, and Ecosystems (Ecological Studies)
The upper part of the sedimentary sequence is dated as Carnian-Norian (210 million years ago) on the basis of vertebrate fossil evidence. Therefore the age of Tiki Formation is considered to be middle to upper Triassic, 225ע15 million years ago (Dutta and Das 1996). 4 Analytical Procedures The thin sections of the samples were carefully studied to identify portions rich in pedogenic micrite so that sparite-rich portions could be avoided. Micriticrich parts of the samples were thoroughly cleaned with deionized water in an ultrasonic bath.
4A). Microscopic observations of the detrital globules reveal that they are composed mostly of micrite and minor microspar with one or two sand-sized detrital quartz grains ﬂoating in the carbonate groundmass (Fig. 4B). A number of globules show radial fractures ﬁlled with either blocky spars or barite. Spar-ﬁlled, circum-granular cracks also have been noted in some of the globules along with such pedogenic features as clotted micrite and corroded detrital quartz grains (Fig. 4B,C). The ﬁeld occurrence of paleosols in the Denwa Formation is limited, and only the widespread occurrence of detrital globules with pedogenic microfabrics provides indirect evidence of pedogenesis during the later part of the Denwa sedimentation.
The paleo- 2. 8. Reconstruction of palaeolatitude of India between 255 and 65 Ma as proposed by Scotese (1997). The ﬁgure also shows the distributions of the ocean basins and continents at 65 Ma. geographic reconstructions of the Gondwana landmasses indicate that the study area was situated at 60ЊS during the Permian (275ע15 million years ago), at 50 to 40ЊS during the middle to upper Triassic (240–205 million years ago), and at 25ЊS during the late Jurassic to early Cretaceous (175ע30 million years ago), as shown in Fig.