AFFIRMATION OF PTEROSPATHODUS EOPENNATUS ZONE(CONODONTA) AND THE AGE OF THE SILURIAN SHAMAO FORMATION IN ZIGUI,HUBEI AS Pterospathodus eopennatus(牙形刺)带的确认与志留系纱帽组的时代及相关地层的对比
DISCOVERY OF EARLY TRIASSIC NEOSPATHODUS TIMORENSIS FAUNA IN ZIYUN OF GUIZHOU贵州紫云早三叠世Neospathodus timorensis动物群的发现