Journal of Palaeogeography     2020 9 (2):  150-167    ISSN: 2095-3836  CN: 10-1041/P Morphology and features of Cambrian oncoids and responses to palaeogeography of the North China Platform En-Zhao Xiao1, Ming-Xiang Mei1, Shu Jiang2, Tehseen Zafar3,4 1 School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China; 2 Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education and Faculty of Earth Resources, China University of Geosciences (Wuhan), Wuhan 430074, China; 3 Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; 4 Institute of Geology, University of the Punjab, Lahore 54590, Pakistan Received: null  Revised: null  Online: null Supporting info