以下为句子列表：
英文: 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.
中文: 第 -A~层产Lytophiceras和Ophiceras,为早三叠世菊石带Ophiceras-Lytophiceras的带化石。
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