Among the most ancient and primitive sharks is Cladoselache, from about 370 million years ago,[9] which has been found within Paleozoic strata in Ohio, Kentucky and Tennessee. At that point in Earth's history these rocks made up the soft bottom sediments of a large, shallow ocean, which stretched across much of North America. Cladoselache was only about 1 metre (3.3 ft) long with stiff triangular...
Friday, 13 April 2012
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