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The appearance of the bones of quadrupeds, especially those of complete bodies in the strata, tells us either that the layer itself which carries them was in earlier times dry land or that dry land was at least formed in the immediate area.
四足动物骨骼的出现，特别是地层中完整躯体骨骼的出现，告诉我们，携带它们的地层本身是在早期的陆地上，或者陆地至少是在附近地区形成的。
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