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The calcium in the bones is replaced during fossilization. Кальций в костях был замещен во время окаменения.
Their skeletons are very rare, perhaps because they lived inland, where conditions for fossilization were not as good as they were in the coastal seas. Их останки очень редки, возможно потому, что жили они на суше, где условия для их сохранения гораздо хуже, чем на берегу моря.

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