chert造句
1. Paleontologists know chert as a good place to look for fossils.
2. In Motuosarla Fe and Mn deposit, the chert mainly distributes in iron ore bed, some on its top and at its bottom, with a relatively stable thickness.
3. The thin bedded siliceous - rocks include chert and depositional quartz with textures of oolite and pebble.
4. There exists abundant Radiolaria in the chert, and the radiolarian association suggests that the chert was formed in the last period of Late Jurassic.
5. Microscopic studies of the kerogen from the chert samples show that the main components of the kerogen are organic fragments and microsome with weak anisotropy.
6. Thus we can better understand the deformation of chert in a highly fluid form.
7. Chert with good abrasion the major content in conglomerate and diamonds are contained in it generally.
8. The Middle Permian Chihsia Formation of South China is featured by nodular chert, which is of implications in the reconstruction of coeval paleogeography and paleoceanography.
9. The cardium sandstone is lithic, being composed of grains of chert, quartz, quartzite, silicified argillite , and other rock fragments.
10. The sediments in this photo curve near the ends of chert pods.
11. The southern region includes western and southeastern Yunnan as well as western and southern Guangxi. The Late Palaeozoic and Early Mesozoic radiolarian chert sequences occur there.
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12. The Anasazi made arrowheads by chipping away at pieces of glassy obsidian (black) and chert (grey and red) until they became sharp.
13. This study use the microcosmic methods to analyze the micro- fabrics of the Mesozoic and Neozoic chert formations and the Modern sinters in southern Tibet, try to reveal their geological information.
14. Carbonate rocks are predominantly composed of intra - clastic dolostone, chert dolostone and sand - bearing dolostone.