They precisely determined the absolute ages of the Katian-Hirnantian boundary (442.65+0.17/−0.23 Ma) and the Ordovician-Silurian boundary (442.33+0.34/−0.33 Ma), constraining the duration of the ...

The "Big Five" mass extinctions of the Phanerozoic Eon have long attracted significant attention from the geoscience community and the public. Among them, the Late Ordovician Mass Extinction (LOME ...

More than 1.1 million international students contributed about $43 billion to the U.S. economy during the 2023-24 academic year, most of it on tuition and housing, according to an analysis by ...

Among all the techniques developed in those years, arguably the most significant for global geoscience was the development of accurate and precise absolute dating techniques, especially U-Pb dating of ...

At one level, the issues under debate are narrow to the point of pedantry – rock experts quibbling over whether the Anthropocene merits inclusion in the International Chronostratigraphic Chart ...

Stratigraphers are used to thinking in vast stretches of time. The International Chronostratigraphic Chart starts with the Hadean eon, which began with the birth of the planet, 4.5 billion years ago.

A proposal to codify a new geological epoch based on humanity's influence on Earth has been rejected. It means "the Anthropocene" will not be added to the chronostratigraphic chart featured in ...

Of the more than 115 intervals of geologic time indicated on the International Chronostratigraphic Chart, 80 are associated with a specific physical site.