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Southeastern Ohio was a swamp-covered coastal plain. [4] Ferns and horsetails were among the state's rich flora. [3] Ohio was only about 5 degrees north of the equator. Sand and mud deposited on local river deltas gradually filled in the swamp. Later in the Permian Ohio was subjected to geologic uplift and its sediments were eroded away ...
Dunkleosteus. Dunkleosteus is an extinct genus of large arthrodire ("jointed-neck") fish that existed during the Late Devonian period, about 382–358 million years ago. It was a pelagic fish inhabiting open waters, and one of the first apex predators of any ecosystem. [1]
Gar. Gars are an ancient group of ray-finned fish in the family Lepisosteidae. They comprise seven living species of fish in two genera that inhabit fresh, brackish, and occasionally marine waters of eastern North America, Central America and Cuba in the Caribbean, [1][2] though extinct members of the family were more widespread. They are the ...
Eurypterids, often informally called sea scorpions, are a group of extinct arthropods that form the order Eurypterida. The earliest known eurypterids date to the Darriwilian stage of the Ordovician period 467.3 million years ago. The group is likely to have appeared first either during the Early Ordovician or Late Cambrian period.
Prehistoric fish are early fish that are known only from fossil records. They are the earliest known vertebrates, and include the first and extinct fish that lived through the Cambrian to the Quaternary. The study of prehistoric fish is called paleoichthyology. A few living forms, such as the coelacanth are also referred to as prehistoric fish ...
September 4, 2024 at 3:12 AM. Fossils predating the dinosaurs by hundreds of millions of years have been found in a paving stone in a Scottish city centre. Thousands of people have walked over the ...
Ordovician (485–443 Ma): Fish, the world's first true vertebrates, continued to evolve, and those with jaws (Gnathostomata) may have first appeared late in this period. Life had yet to diversify on land. Arandaspis. Arandaspis are jawless fish that lived in the early Ordovician period, about 480–470 Ma.
Fossil of the Middle-Late Ordovician giant trilobite Isotelus. Life restoration of the Carboniferous-Permian amphibian Phlegethontia. Life restoration with a conifer-like body plan of the Silurian-Late Devonian tree-like probable fungus Prototaxites. John William Dawson (1888).