AFFIRMATION OF PTEROSPATHODUS EOPENNATUS ZONE(CONODONTA) AND THE AGE OF THE SILURIAN SHAMAO FORMATION IN ZIGUI,HUBEI AS WELL AS THE CORRELATION OF THE RELATED STRATA
AFFIRMATION OF PTEROSPATHODUS EOPENNATUS ZONE(CONODONTA) AND THE AGE OF THE SILURIAN SHAMAO FORMATION IN ZIGUI,HUBEI AS WELL AS THE CORRELATION OF THE RELATED STRATA
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