About 540 million years ago, the oceans were an alien landscape, devoid of swimming, or nektonic, creatures. Some scientists have hypothesized, based on fossil evidence, that swimmers suddenly ...
Artist’s impression of the landscape over 400 million years ago, when plants began diversifying the arrangement of their vascular tissues, increasing their overall stature, and exploring increasingly ...
Discovered over 160 years ago, Prototaxites fossils continue to divide scientists. These 400-million-year-old structures may belong to a completely extinct branch of life. Prototaxites in an Early ...
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