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一、前言为了验证和补充天津蓟县中、上元古界层型剖面,在国内若干地区选定了几条辅助剖面加以研究。本文涉及的燕山西段就是其中剖面之一。河北地质学院、河北龙烟铁矿、华东石油学院等单位的地质工作者,在本区作了大量工作,取得了不少成果。在综合了宣化庞家堡、涿鹿黄土港、黑山寺和怀来赵家山等剖面的基础上,建立了燕山西段完整的上前寒武纪地层系统。该区与蓟县剖面比较,虽然在西部的地层缺失较多,厚度变薄,有些
I. Preface In order to verify and supplement the Middle and Upper Proterozoic stratigraphic profiles in Jixian, Tianjin, several auxiliary profiles were selected for study in several areas in China. This article deals with the western section of the Yanshan is one of the profiles. Hebei Geological Institute, Hebei Longyan Iron Mine, East China Petroleum Institute and other units of geological workers, made a lot of work in this area, and achieved a lot of results. Based on the profiles of Pangjiabao (Xuanhua), Huangpu Port (Zhulu), Heishan Temple and Huailai Zhaojiashan Mountain, a complete Precambrian stratigraphic system was constructed in the western part of Yanshan Mountain. Compared with the Jixian section in this area, although the strata in the west are missing more and the thickness is thinner, some