アメリカ自然史博物館のインスタグラム(amnh) - 8月16日 05時35分

It's time for Trilobite Tuesday! Back in the early Paleozoic trilobites filled the oceans, inhabiting virtually every available marine niche. It was during this time that they emerged as the first life forms on Earth to feature a hard exoskeleton. Due to that major evolutionary advance, their remains are pervasive in the fossil record, providing important stratigraphic markers to key geologic horizons worldwide. Indeed, when trilobites of a similar age and locale are viewed together, and then compared and contrasted with specimens of the same genus found in other locations, these fossils often provide an unrivaled perspective on the primordial forces that helped shaped our world. Perhaps nowhere is this paleontological phenomenon more evident than when dealing with the Middle Cambrian trilobite Paradoxides. If you examine various specimens of that genus, you will note something interesting: that fossils of closely related Paradoxides species have been uncovered in such now-disparate sites as Newfoundland, Sweden, Massachusetts, Wales, Spain, the Czech Republic and Morocco. #trilobitetuesday #trilobite #trilobites #amnh #naturalhistory #fossil #fossils

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