The earliest geological period in the Phanerozoic eon was the

Name: The earliest geological period in the Phanerozoic eon was the
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The Phanerozoic eon is divided into three geological eras: Paleozoic, Mesozoic and Cenozoic. The Cambrian is the earliest period in the Paleozoic era and marks the beginning of the Phanerozoic eon, approximately 541 million years ago. The other options listed are periods that occurred later in the Phanerozoic eon.

The Earliest Geological Period in the Phanerozoic Eon Was the