Abstract
The age of the lacustrine Nihewan Group has been a matter of dispute for decades. An initial Early Pleistocene age was extended to Late Pleistocene based on palaeolithic evidence and mammal fossils. The presence of a short reversed polarity zone proposed to represent the Blake geomagnetic excursion (0.117Ma B.P) apparently confirmed this age[1]. We report on a new, high-resolution paleomagnetic record from two parallel sections at Xujiayao revealing a Normal polarity zone at the middle-upper section and an extensive reversed polarity zone within the middle-lower part of the section. K-A ages (0.45±0.08 B.P and 0:38±0:07Ma B.P) of basalt underlying the lacustrine sediments nearby whose horizon can be correlated to the layer with normal polarity at the paleolithic section suggest the normal and reversed polarities should be Brunhes and Matuyama Chron. The Blake reversed excursion was denied. The Nihewan Group at Xujiayao and the paleolithic layers within the lacustrine sediments must hence be much older than Late Pleistocene.
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.
