名词
中文翻译：石核
同义词：
['lithified stone', 'lithopone']
例句：
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1.The stromatoliths are a fossilized layer of limestone that has been weathered over millions of years.
这些石核是经过数百万年风化形成的石灰岩层。
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2. Scientists have discovered stromatoliths in the Arctic tundra, which could indicate the presence of ancient life.
科学家在北极苔原发现了石核，这可能表明古代生命的存在。
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3. The stromatoliths were formed by the accumulation of calcium carbonate on the surface of marine organisms.
这些石核是由海洋生物表面钙质碳酸盐的积累形成的。