山东临朐一带古近——新近纪地层的划分

Stratigraphic Division of Paleogene Period and Neogene Period in and near Linqu,Shandong Province

根据昌乐、临朐一带古近—新近纪地层重点勘查成果及发现的孢粉、微体及腹足类化石等资料,认为昌乐五图组中的煤及油页岩地层年代为古近纪中始新世;临朐牛山七贤店山沟中出露的一套粘土岩、泥岩夹含油泥岩,可与五图组上煤段对比,其地层年代为中始新世晚期;临朐山旺村山沟中出露的一套粘土岩夹硅藻岩等,前人认为地层年代为中新世山旺组,本次勘查获得的孢粉谱对其提供了佐证;柳山坪南头村山顶上出露一套厚层花岗质含砾粗砂岩(底部夹泥煤一层),平覆在花岗片麻岩山顶,依孢粉谱与山旺组对比,其地层年代要晚于山旺组,可与尧山花岗片麻岩山顶的尧山组相比,地层年代属于上新世尧山组。

Based on the Changle, Linqu region Paleogene Period and Neogene Period intensive stratigraphic investigation results and discovered sporopollen, mierofossil and gastropod data, considered that chronological age of coal and oil shale in Wutu Formation, Changle belongs to Middle Eocene Epoch, Paleogene; a set of claystone, mudstone intercalated with oil mudstone outcropped in Qixiandian mountain valley, Niushan, Linqu can be correlated with Upper Coal Member, Wutu Formation, chronologically belongs to later stage of Middle Eocene Epoch; a set of claystone intercalated with diatomite outcropped in a mountain valley near the Shanwang village, Linqu, predecessors thought it belongs to Shanwang Age, Miocene Epoch, sporopollen spectrum obtained during this investigation provided it with corroborative evidence; a set of thick bedded granitic pebbled grit （a slime coal intercalated in bottom part） outcropped fiat-lying on a granite-gneiss hill top, Nantoucun village, Liushanping, correlated it with Shanwang Formation according to sporopollen spectrum, its chronological age should be later than Shanwang Formation, can be correlated with the Yaoshan Formation on the Yaoshan granite-gneiss hill top, chronologically belongs to Yaoshan Age, Pliocene Epoch.