The Boring Billion: A Deep History of Earth's Longest Quiet (The History of Earth Book 11)
English | 16 Oct. 2026 | ASIN: B0HN7ZMJCG | 294 Pages | Epub | 4.50 MB
In 1995 three scientists sampled two and a half kilometres of Australian limestone every ten to twenty metres and found the carbon of a vanished sea holding within a part or two per thousand of zero for hundreds of millions of years. Was the planet still, or was the instrument stuck? The interval from about 1,800 to 800 million years ago has been called the boring billion, a name already set in quotation marks, as something the interval "has been called", in the 2006 paper this book traces it to.The Boring Billion: A Deep History of Earth's Longest Quiet reads that line against every other witness the rocks hold. Iron chemistry from shales of fourteen regions describes a layered, iron-rich ocean. Pigments of purple sulfur bacteria from a 1,640-million-year-old rift basin put hydrogen sulfide, by the ecology of their living relatives, within about twenty metres of the sunlight. Oxygen estimates run from a thousandth of the present level, by chromium isotopes, to several per cent, by air trapped in salt and by a model of one basin's bottom water, and the methods differ by as much as two orders of magnitude. A rift erupted two million cubic kilometres of lava, a collision raised a Himalayan-scale mountain belt, and the sea's surviving records, at the resolution they allow, show little answer to either. No ice sheet is known under a fainter Sun, and the greenhouse budget does not close.The reader will understand why a flat line can be the signature of a regulated planet, and why that reading is a hypothesis rather than a proof. Low oxygen, a starved iron-rich ocean and a carbon cycle tied to both may have held one another in place while oxygen rose in some basins and later rocks elsewhere read low again, until the records changed over a window around 800 million years ago in an order that is still argued. Evidence and its limits are named. It is the eleventh volume of The History of Earth, the Silence of the Earth library of evidence-led natural history.
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