| 词汇 | paleocurrent |
| 释义 | BETA Examples of paleocurrentpaleocurrent isn’t in the Cambridge Dictionary yet. You can help! Our scattered paleocurrent work has provided evidence for episodes of flow to most directions of the compass. In tidal areas, which have bidirectional flow, structures are formed with alternating layers of cross-beds dipping in opposite directions that reflect the alternating paleocurrent. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Occurring as they do only at the bottom of beds, and their distinctive shapes, they can make useful way up structures and paleocurrent indicators. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Repeated avalanches will eventually form the sedimentary structure known as cross-bedding, with the structure dipping in the direction of the paleocurrent. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Paleocurrent can be determined by seeing a cross-section of a set of cross-beds. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The orientation of the lineation is used as a paleocurrent indicator, although the precise flow direction (i.e. upstream vs. downstream) is often indeterminable. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Repeated avalanches will eventually form the sedimentary structure known as cross-stratification, with the structure dipping in the direction of the paleocurrent. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The grain size indicates moderate paleoflow velocities with a paleocurrent direction to the south-southwest. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Cross beds can tell modern geologists many things about ancient environments such as- depositional environment, the direction of sediment transport (paleocurrent) and even environmental conditions at the time of deposition. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Wadell found the long axis aligned with paleocurrent, and dipping basinward in glacial sediments, whereas deltaic gravels may be oppositely inclined. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is needed because in some depositional environments, like meandering rivers, the paleocurrent resulting from natural sinuosity has a natural variation of 180 degrees or more. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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