Mr. Evans thought that there would be great difficulty in estimating geological periods from the variations between the axis of figure and the axis of rotation, inasmuch as at no given time could ...

The Jurassic Period is one of the three prehistoric geological periods of the Mesozoic Era. It spans from 145 million to 201 million years ago. This period was preceded by the Triassic Period and ...

Despite their survival through several geological time periods, many present-day sturgeon species are at threat of extinction, with 17 of 27 species listed as “critically endangered.” ...

They are used to date archaeological and geological samples ... Koll explains, "For periods spanning millions of years, such cosmogenic time markers do not yet exist. However, this beryllium ...

They are already well-studied by previous micropalaeontology research and sample a range of critical periods in Earth’s history during ... oxygen and carbon dioxide levels changed over geological time ...