Precambrian+Time

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The Precambrian (Pre-Cambrian) is the name which describes the large span of time in Earth's history before the current Phanerozoic Eon, and is a Supereon divided into several eons of the geologic time scale. It spans from the formation of Earth around 4600 Ma (million years) ago to the beginning of the Cambrian Period, about 542 Ma, when macroscopic hard-shelled animals first appeared in abundance.

The PreCambrian time period is the formation of the earth 4.6billion years ago to 542 million years ago

This was the longest of the time periods.

This is when the ozone layer develops.

Cyanobacteria begins photosynthesis and produces oxygen.

Prokaryotes and cells with nuclei form.

invertebrates appear

simple multi celled life

had the first eukaryotic cells



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