PETROSTRATIGRAPHY AND PALEOTOLOGICAL FEATURES OF FEIXIANGUAN FORMATION OF LOWER TRIASSIC SERIES IN XIAOYUDONG DISTRICT,PENG ZHOU,SICHUAN
PETROSTRATIGRAPHY AND PALEOTOLOGICAL FEATURES OF FEIXIANGUAN FORMATION OF LOWER TRIASSIC SERIES IN XIAOYUDONG DISTRICT,PENG ZHOU,SICHUAN
彭县小渔洞地区飞仙关组岩石地层和古生物特征