Gneiss Examples
片麻岩例子
 | This sample of gneiss rock shows layering of two different kinds of rock, leading to its classification as a metamorphic rock. The layering also shows bending, suggesting that it has been subject to pressures. 这种片麻岩样本显示出两种不同岩石的层理，因此被归类为变质岩。层理也显示出弯曲，表明它曾受到压力作用。
This rock was included in a display of geologic ages at the Smithsonian Museum of Natural History. The suggested age was 2 billion years. 这块岩石被陈列在史密森尼自然历史博物馆的地质年代展览中。其建议年龄为20亿年。
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This sample, which was also classified as gneiss, was identified as having come from Wyoming, from the North Laramie Mountains. One part of it was associated with an age of 2.6 billion years, and another part as 1.8 billion years.
这块岩石也被归类为片麻岩，经鉴定来自怀俄明州的北拉莫ie山脉。其中一部分与26亿年的年龄相关，另一部分则与18亿年的年龄相关。
索引
| HyperPhysics*****Geophysics
HyperPhysics ***** 地球物理学 | R Nave |
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