The boring billion
A thousand million years in which almost nothing changes
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The interval from roughly 1.8 to 0.8 billion years ago has no ice ages, no large carbon isotope excursions and remarkably little evolutionary novelty. The ocean was probably sulphidic and oxygen-poor below the surface, with low levels of trace metals such as molybdenum and zinc that complex cells require. The supercontinent Columbia broke up only partially, giving low volcanic and tectonic activity and therefore meagre nutrient supply. The label "boring" is polemical: several researchers argue that eukaryotes spent this period doing the internal rebuilding that made everything later possible. Stability is not the same as stagnation.
For children
Between two great upheavals lies a period of a whole billion years in which Earth almost stands still. The climate is steady, the ocean unchanging, and life barely alters. It is the longest quiet stretch the planet has known — and researchers still argue about why.
Connects to
Part of Terra Saga — the story of Earth on a timeline. terrasaga.org