摘要
近年来,在华北盆地临清断块下白垩统丘城组之下,钻井揭露出一套暗色地层,主要为灰色、灰黑色泥岩、砂岩与灰色凝灰质砂岩、凝灰岩互层。横向分布较稳定,曾见于临9井、临10井、临11井和丘4井。地质矿产部第二石油普查勘探指挥部命名为"临西组",归于晚侏罗世,与山东的蒙阴组对比。而笔者1982年以来,发现的孢粉、介形类、轮藻、腹足类等新资料,其地质时代以早白垩世为宜。
Abstract
This paper systematically studies sporopollen,ostracoda,charophyta and gastropoda of the Linxi Formation in southern Hebei.Sporopollen assemblage of the Linxi Formation is characterized dominantly by gymnospermous pollen,abundance of pteridophytic spores,but no angios-permous pollen are found there.The main members of the assemblage include Schizaoisporites,Cicatricosisporites,Osmundacidites,Densoispoyites,Classopollis Cycadopites and disaccate;Ostracoda:Cypridea (Ulwellia) taihangshanensis,C.(Cy-pridea) unicostata,Damonella extenda,D.ovata,Ziziphocypris linchengensis,Monosulcocypris sp.,Darwinula sp.,Rhinocypris sp.,Charophyta:Mesochara stiptata;Gastropoda:Probaicalia sp.,Brotiopsis sp.Biostratigraphically,the Linxi Formation might be correlated with the Rehe Group in Hebei,the Jiande Group in Zhejiang,the Laiyang Formation in Shandong,the Bayanhua Formation in Inner Mongolia.Geological age of the Linxi Formation may probaply belong to Berriasian-Valanginian period.
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