The principal fold age of the two "Indosinian geosynclines" is between the Middle and Late Eocene, which is marked by the regional flagrant unconformity below the Mengla Group and equivalent horizons.
这两个“印支地槽”的主要褶皱时代是中、晚始新世之交，以勐腊群及其相当层位之下的区域性巨大不整合为标志。
Many types of oncoids are well developed in the Middle Member of the Guanzhuang Formation of Eocene in Pingyi Basin.
平邑盆地下第三系官中段核形石较为发育，类型多样。
The Mesozoic primary hydrocarbon accumulation has been heavily damaged by the denudations at latest middle Jurassic and latest Cretaceous and the faulting from Paleocene to Eocene.
中侏罗世末期、白奎纪末期的 地层抬升 剥蚀，以及古-始新世的断裂活动对中生代形成的原生 油气藏破坏作用明显。
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