| 词汇 | microfossil |
| 释义 | microfossil noun[ C ] uk /ˈmaɪ.krəʊˌfɒs.əl/ us /ˈmaɪ.kroʊˌfɑː.səl/ a fossil that is too small to see without using special equipment微化石，微体化石 STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY/GettyImages Palaeontology & fossils ammonite ammonoid biozone carbon dating fossil fossil record fossilization fossilize fossilized index fossil missing link palaeontologist palaeontology petrifaction petrify radiocarbon dating unfossiliferous microfossil | American Dictionarymicrofossil noun[ C ] us/ˈmɑɪ·kroʊˌfɑs·əl/ earth science a fossil that is too small to see without using special equipment Examples of microfossilmicrofossil Unfortunately the title of the volume gives the impression that palynomorphs, which have organic walls, are not microfossils. The discussion on chemical procedures deals almost exclusively with the extraction of microfossils from different matrices. An integrated, multidisciplinary approach to this study is essential for the verification of any artefact purported as a microfossil. However, the interpretation of ancient microfossils found even in terrestrial sediments has been hotly debated for years. While many of the larger microfossils herein are similar in size to extant eukaryotic micro-algae, they cannot be regarded as unequivocally eukaryotic. Mineralized microfossils have typical dimensions significantly smaller than the resolution of any spacecraft instrument. Advantages of doubly polished thin sections for the study of microfossils in volcanic rock. After having read the book, nobody can doubt that microfossils should become a standard tool in future environmental studies. In petrographic thin sections cut perpendicular to the bedding, the microfossils appear only as very thin, dark streaks. However, it is still unclear how these processes affect the internal microstructure of such remains, or even how to recognize bona fide preserved microfossils. This allowed observation of opaque (carbonized) microfossils, and also assessment of the fossil nature of the isolated microstructures. The authors have succeeded in this as the book presents numerous case studies, which clearly demonstrate the unique applicability of these microfossils. The growing importance of microfossils for biosteering horizontal wells is not mentioned; however, this contribution is helpful as a teaching aid. Not all lakes possess sediment records that lend themselves to isotopic study using oxygen isotope ratios in carbonate microfossils. The details of the physical characteristics will have relevance when correlated with the pollen and microfossil analysis. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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