arachnomorph |
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navigate by keyword : age ancient animals arachnomorph archaeological archeology arthropods background biology cambrian cenozoic closeup earth era evolution excavation extinct fossil fossils geologic geological geology group imprint limestone marine paleozoic period plant prehistoric rock science sea spiral stone time trilobite trilobites |
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The imprint of the ancient trilobites in a stone. Trilobites, a fossil group of extinct marine arachnomorph arthropods, class Trilobita |
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