Geological Expeditions of Yore ep.8 – Arthur Holmes

Episode summary introduction:​ ​  “How old is the Earth?” Generations of scholars have asked this fundamental question, and estimates ranged from a few thousand years to indefinite time spans. Geologic and biologic observations from the 18th and 19th centuries (like Darwin’s theory of evolution and Hutton’s concept of deep time) suggested that Earth was old – but […]