In which specific Era of the Phanerozoic Eon, did shelly organisms first appear in the fossil record? _________________________

Name: In which specific Era of the Phanerozoic Eon, did shelly organisms first appear in the fossil record? _________________________
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In which specific Era of the Phanerozoic Eon, did shelly organisms first appear in the fossil record?   _________________________

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The Answer of In which specific Era of the Phanerozoic Eon, did shelly organisms first appear in the fossil record?   _________________________

In Which Specific Era of the Phanerozoic Eon, Did Shelly