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Fossil diatoms and pollen from sea-floor sediments beneath the Ross Ice Shelf indicate that a permanent ice cover was not present in the Ross Sea and that vegetation including angiosperms, gymnosperms, and ferns existed on at least some parts of the largely glaciated Antarctic mainland in the late middle Miocene. 相似文献
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Marx J 《Science (New York, N.Y.)》2006,314(5798):405
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Gregory JT 《Science (New York, N.Y.)》1989,245(4921):992-993
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Vesicular-arbuscular mycorrhizae are significant in the physiology and ecology of extant vascular plants, and they may also have played a major role in the origin of the vascular land flora. The case for fossil vesicular-arbuscular mycorrhizae rests upon hyphae and chlamydospore-like bodies in several Paleozoic taxa, but fossil arbuscles are unknown to date. Specimens from the Triassic of Antarctica represent the first known occurrence of arbuscles in the fossil record. 相似文献
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Culotta E 《Science (New York, N.Y.)》1993,262(5133):498-499
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Service RF 《Science (New York, N.Y.)》2002,298(5602):2322-2323
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Fossil fuels as a source of mercury pollution 总被引:1,自引:0,他引:1
O I Joensuu 《Science (New York, N.Y.)》1971,172(987):1027-1028
The upper limit of the quantity of mercury released by weathering processes is approximately 230 metric tons per year. The quantity of mercury released by burning of coal is estimated to be of the order of 3000 tons per year, a quantity comparable to that emitted as waste from industrial processes. 相似文献
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Well-preserved Lower Cretaceous fossil copepods related to the super-family Dichelesthioidea have been collected from the gill chamber of the ichthyodectid fish Cladocyclus gardneri. The fossils provide conclusive evidence suporting recent theories that link caligid copepods, which are parasitic on fish, to the invertebrate-associated siphonostomes. This is the first discovery of fossil parasitic copepods, and they are by far the oldest copepods of any sort known. 相似文献
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Hansen TA 《Science (New York, N.Y.)》1981,214(4523):915-916
Fossil molluscan larvae are less facies dependent and have a wider geographic range than their adult counterparts. They are also easily recovered from cores and small samples. With proper documentation, the study of fossil larvae can considerably enhance the biostratigraphic potential of macrofossils. 相似文献
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Saini A 《Science (New York, N.Y.)》2012,335(6076):1562-1563
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Bayes offers a 'new' way to make sense of numbers 总被引:1,自引:0,他引:1
Malakoff D 《Science (New York, N.Y.)》1999,286(5444):1460-1464
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