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粪化石是生物进化过程中动物残留下来的粪便,经过数万年的沉淀后演变成的化石。粪化石的形态各异,有的呈陀螺型,有的呈纺锤型,大小差异也很大。颜色有黑、黄、黄褐等。色泽鲜艳,质地比较坚硬的粪化石,被称为牛宝石,曾经被当作欧洲贵妇人的装饰品。我国鱼粪化石发现较多。1934年贵州桐梓发现一枚鱼粪化石,时代为白垩纪早期。1951年陕北三叠纪和侏罗纪地层中发现大批鱼粪化石,1961年在延安以西也发现过成层的鱼粪化石。从它们的形状和内含物证明有些是属于软骨鱼类的,有些是属于肉食性鱼类的。
Fecal fossils are the remains of animals that have evolved during the biological evolution and have become fossils after tens of thousands of years of sedimentation. Different forms of fecal fossils, some were top-type, and some spindle-type, the size difference is also great. Colors are black, yellow, yellow brown and so on. Bright color, relatively hard texture dung fossils, known as the cow gem, once used as a European lady’s decorations. China found more fish fecal fossils. 1934 Guizhou Tongzi found a fish dung fossils, the era of the early Cretaceous. A large number of fish fecal fossils were found in the Triassic and Jurassic strata of northern Shaanxi in 1951, and stratified fecal fossils were also found west of Yan’an in 1961. Some of their shape and inclusion prove to belong to cartilaginous fish and some to carnivorous fish.