Abstract
Isotopic dating suggests that four major glacial cycles have occurred within the past half-million years, whereas no more than two cycles are generally recognized from the preceding one and a half million years. This change of duration, which provides a test for theories of ice ages, cannot be directly explained by existing theories of oscillating geo-climatic systems without introducing tectonically induced physiographic changes: such changes seem to affect chiefly the oscillation period of Ewing and Donn's system incorporating alternate icing and de-icing of the Arctic ocean.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
