Under the SeaMany trilobites took on new location-dependant forms, occasionally quite exotic. There was diversity in undersea life like bryozoans, brachiopods, bivalves, and trilobites. '
The first jawless fish swam in the great oceans, and mollusk-like predators preyed upon much smaller animals at the ocean bottom. End of the OrdovicianThe Ordovician began after the Cambrian-Ordovician extinction.
A massive Ice age occurred at the end of the period, all of life at the time (some early forms of plants lived on land) was aquatic at the time so the cooling rapidly changed the currents and temperature of the water all over the world killed 70% of life. Only the most adaptable survived. The extinction ranks 2nd out the five major extinctions. GeologyPlate movement may have started the Ordovician ice age. Glaciers begin to form in the Sahara region of Africa, and Gondwana began moving across the south pole.
ClimateEvidence of an ice age has been observed in many continents, which were barren at the time because terrestrial plants had not yet evolved. The sea was warm and life-filled, but the land was a barren, frozen desert. |
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