The Precambrian eon is vast, almost unimaginably so. In fact, before some fossil discoveries were made ... time prior to the Cambrian period. Hadean Era (4,550-3,850 mya) The Precambrian's oldest ...

The Hadean Eon—the first 500 million years of Earth’s history—left behind almost no physical record. The oldest confirmed ...

The Hadean protocrust is the name for the earth’s crust — its outermost layer — when it first formed. The ‘Hadean’ prefix refers to the planet’s first geologic aeon. At this time ...

The way amino acids are synthesized has changed during the history of Earth. The Hadean eon represents the time from which Earth first formed. The subsequent Archean eon (approximately 3,500 ...