Orbitally driven ammonium upwelling fueled primary productivity during the peak Cambrian Explosion - Guangming Meng; Haifeng Gai; Chengang Lu; Yanming Zhao; Yineng Tan; Yang Liu; Yue Feng; Gang Li; Xing Wang; Wei Liu; Yijie Xing; Ping Gao; et al. (Palaeogeography, Palaeoclimatology, Palaeoecology, 2026)