Early Devonian graptolites from the Qinzhou-Yulin region, southeast Guangxi, China Chen, Xu ; Ni, Yunan ; Lenz, Alfred C. ; Zhang, Linna ; Chen, Zhongyang ; Tang, Lan ; Jin, Jisuo Abstract Publication: Canadian Journal of Earth Sciences Pub Date: November 2015 DOI: 10.1139/cjes-2015-0025 Bibcode: 2015CaJES..52.1000C