Devonian Limestone, Crinoids, & The Alien

The Devonian Period found major parts of Earth's land areas covered for the first time with vegetation. Marine invertebrates such as trilobites, corals, cephalopods, and crinoids lived in the seas while sharks and shark-like fishes appeared for the first time. A variety of fishes lived in brackish waters, including lobe-finned fish, lungfish, and bony-armored fish... Continue Reading →

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