Jingyuan 第1页

Middle Triassic Palynological assemblage in the Wangjiashan Basin of Jingyuan, Gansu and Its Stratigraphical Significance A NEWVARIETY OF XANTHIUM L. FROM GANSU CHINA——XANTHIUM SIBIRICUM VAR. JINGYUANENSE SULFUR DIOXIDE POLLUTION CONTRIBUTES TO OUTBREAK OF THE SAWFLY DIPRION JINGYUANENSIS XIAO AND ZHANG (HYMENOPTERA:DIPRIONIDAE)