Ammonoids Lytophiceras and Ophiceras are discovered in bed -A to bed , and regarded as the zonal fossils of the early Triasic ammonoid Ophiceras-Lytophiceras zone, indicating the Early Triassic in age.
Ammonoids Lytophiceras and Ophiceras are discovered in bed -A to bed , and regarded as the zonal fossils of the early Triasic ammonoid Ophiceras-Lytophiceras zone, indicating the Early Triassic in age.
第 -A~层产Lytophiceras和Ophiceras,为早三叠世菊石带Ophiceras-Lytophiceras的带化石。