Ordovician-Silurian extinction | Overview & Facts | Britannica
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When Sponges, Trilobites, and Jawless Fish Ruled the Earth
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How long did the Ordovician period last?show all your working o... | Filo
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The Ordovician Mass Extinction Killed 85 Percent Of Life On Earth In A Totally Unique Way
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BrennanThePaleoDude on Instagram: "I would have loved to scuba dive in the Ordovician reefs! The Ordovician Period lasted almost 45 million years, beginning 488.3 million years ago and ending 443.7 million years ago. During this period, the area north of the tropics was almost entirely ocean, and most of the world’s land was collected into the southern supercontinent Gondwana. Ordovician reefs were built by a variety of organisms, including sponges, corals, and microbes, and were teeming with di
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