Geochronology is the scientific discipline focused on determining the absolute and relative ages of rocks, minerals, fossils, and geological events, thereby establishing the temporal framework of Earth’s history. It relies on quantitative dating methods, primarily radiometric techniques such as U–Pb, Ar–Ar, Rb–Sr, and Sm–Nd systems, which exploit the known decay constants of radioactive isotopes in specific mineral phases. These data are integrated with stratigraphic principles and chronostratigraphic units to construct calibrated timescales, constrain rates of tectonic, magmatic, and surface processes, and correlate geological records across regions and datasets.
Surface rocks can reveal records of regions they occupied millions of years ago, even if those areas were kilometers below ground. On Türkiye's Marmara Sea's southern shores and islands, granitic rocks that are now exposed ...
Earth Sciences
8 hours ago
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Where oceanic crust subducts beneath continental crust, belts of volcanoes known as continental arcs can form. Located around the world, these arcs may undergo episodic magma flare-ups—dramatic surges in the flow of magma ...
Earth Sciences
Nov 6, 2026
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Why is there life on Earth? It's one of the oldest questions humans have asked, and as far as we know, our planet is the only one that holds the answer.
Earth Sciences
Oct 14, 2026
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Mountains preserve evidence of ancient oceans, moving continents and tectonic processes that have shaped Earth over millions of years. Later deformation, erosion and burial, however, can obscure important parts of this geological ...
Earth Sciences
Oct 9, 2026
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Ice cores recovered from an ice cap in northwestern Tibet appear to preserve fragments of ancient ice from the last ice age, extending Earth's glacial record by more than 100,000 years and making them the oldest ice cores ...
Earth Sciences
Sep 30, 2026
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Researchers at The University of Texas at Austin have rewritten a small part of Oklahoma's geologic history with global implications for ancient life. Below the surface of the small town of Ames, Oklahoma, a meteor impact ...
Planetary Sciences
Sep 28, 2026
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Beneath the vast frozen wastes of Antarctica lie the remains of ancient mountains that have long since eroded. Even though they're no longer standing, they can still reveal a few lost secrets. New research published in Earth ...
Some 550 million years ago, Earth looked very different than it does today. The Southern Hemisphere was dominated by an enormous single continent known as Gondwana.
Earth Sciences
Sep 10, 2026
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125
In productive marine environments, a square meter (10.8 square feet) of seafloor can be perforated by hundreds to thousands of isolated and interconnected tunnels through which crawl and writhe a cornucopia of clams, shrimp, ...
Paleontology & Fossils
Aug 21, 2026
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A team of researchers reports that they may have found rock containing some of the earliest forms of microbial life on Earth. Their study, published in the Proceedings of the National Academy of Sciences, describes the biosignatures ...
