（晚中新世-上新世） Middle Miocene （中新世中期） Eocene – Oligocene （始新世-渐新世） Paleocene – Eocene （古新世-始新世） Mesozoic（中生代）
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本文记述了山东临朐山旺组(中新世中期)出产的两件鸟类化石。
Two fossil birds collected from Shanwang Formation, Middle Miocene (about fifteen million years ago), of Linqu, Shandong are here described.
中部背斜带中发育的构造主要为断层转折褶皱和少量断层传播褶皱，开始形成于中新世上新世中期；
The Central Anticline Zone composed of fault-band folds and a few fault-propagation folds, which started to form during Miocene to the middle stage of Pliocene.
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