Journal of Palaeogeography     2019 8 (1):  31-42    ISSN: 2095-3836  CN: 10-1041/P Using geophysical logs to identify Milankovitch cycles and to calculate net primary productivity (NPP) of the Late Permian coals, western Guizhou, China Zhi-Ming Yan1, Long-Yi Shao1, David Large2, Hao Wang1, Baruch Spiro3 1 College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 2 Faculty of Engineering, University of Nottingham, NG7 2RD, UK; 3 Department of Earth Sciences, Natural History Museum, London, SW7 5BD, UK; Received: 2017-12-11  Revised: null  Online: null Supporting info