From the Archaean to the Palaeozoic, Shandong was controlled predominantly by the E-W extending structural systems, and the basement geosynclines and platform sedimentary covers were formed.
太古代至古生代山东主要受到了东西向构造体系的控制，形成了基底“地槽”和“地台”盖层。
2
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.