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The fossils unearthed in Cambrian rocks belonged to complex
invertebrate species like snails, trilobites, sponges, worms,
jelly fish, starfish, marine crustaceans and sea lilies. Most in-
terestingly, all of these distinct species emerged all of a sud-
den. For that reason, this miraculous phenomenon is referred
to as the "Cambrian Explosion" in geological literature.