image tag: cretaceous period, image quantity: 4

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archeopteryx, skeleton, fossil, archosaurs, transitional form, petrification, petrified
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fossil, cretaceous period, baltic sea, warts seeigel, stone, flint, reprint
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dinosaur, psittacosaurus, psittacosaurus mongoliensis, chordata, ceratopsian dinosaur, extinct, prehistoric
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ammonit, ammonoidea, extinct, cephalopods, were, mollusca, shell