Originally, geological history was divided into four spans

Originally, geological history was divided into four spans of time: primary, secondary, tertiary and quaternary.

📖 Bill Bryson

🌍 American | 👨‍💼 Writer

🎂 December 8, 1951

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Geological history was traditionally segmented into four main eras: primary, secondary, tertiary, and quaternary. This classification helped scientists understand the timeline of Earth's formation and the evolution of life over millions of years.

Each of these spans corresponds to significant developments in geology and biology, depicting the complexity of Earth's past. Over time, the understanding of these periods has evolved, allowing for a more nuanced appreciation of the planet's geological history.

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📖 Bill Bryson

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