Почвы и почвоведение

There are real Jurassic parks on Earth. For example, Moscow 180 million years ago was a shallow warm sea. And if today we study the soils of parks where streams erode the soil and form large ravines along the high banks of the Moskva River, we can find layers of black Jurassic clays, in which there are fossilized inhabitants of the ancient sea - cephalopods ammonites and belemnites, which died out together with dinosaurs. What is the oldest thing you found in the soil?
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