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四万十带是海沟的增生体吗?在日本西南部临太平洋一侧,有个名叫四万十带的巨大的地质构造区,它分布于北起房总半岛,南迄琉球群岛(参见图2),最宽约80km,长达1800km以上的地带.四万十带主要由硬质泥岩和砂岩以及它们之间各种不同厚度的互层所构成,由于在四万十带中基本不含有肉眼所能识别的大型化石,所以直至二十世纪五十年代为止,人们还叫它作“时代未详层”,关于它的层序和构造方面自然还有好多问题尚未搞清.
Is there 40,000 zonal seaweed hyperplasia? In the southwestern part of Japan near the Pacific Ocean, there is a huge geotectonic zone named Shimantan, which distributes from North Fongzha Peninsula and South to the Ryukyu Islands (see Figure 2) The widest 80km, up to 1800km above the belt.Fan Shiyan mainly composed of hard mudstone and sandstone and their inter-layer of different thickness of the composition, as in the 40,000 zone basically does not contain the naked eye can identify large fossils So it was not until the 1950s that people still called it “the time is unknown,” and many questions about its sequence and structure have not yet been clarified.