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。
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.
角度不整合是板内褶皱造山变形，平行不整合是板内造陆变形的重要记录。
Angular unconformity belongs to an intraplate folded - orogenic deformation. Parallel unconformity is the record of intraplate epeirogenic deformation.
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