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关于鄂尔多斯断块及其周缘的寒武纪地层与海侵,卢衍豪先生曾有论述。本文将讨论“霍山砂岩”的时代及其时侵的特点。 一、寒武纪海侵的发展 早寒武世筇竹寺期海侵尚未达本区。沧浪铺期始达本区南及西南缘。在北秦岭的洛南至商县一带称三川组,在豫西、中条山至渭北一带可称辛集组,在贺兰山中段称苏峪口组。它们的特点可归纳为:(1)往往以平行不整合覆于震旦系冰碛层(罗圈组、三道撞组、
Regarding the Cambrian stratigraphy and transgression of the Ordos block and its periphery, Mr. Lu Yanhao has discussed it. This article will discuss the “Huoshan sandstone” era and the characteristics of its time invading. First, the development of the Cambrian sea invasion Early Cambrian Qiongzhu phase sea invasion has not reached the area. Canglang beginning of the region reached the south and southwest margin. In the North Qinling Luonan to Shangxian area called Sanchuan group, in the west of Henan, Zhongtiao to Weibei area can be called Xinji Formation, in the middle of the Helan Mountain Suyukou group. Their characteristics can be summed up as follows: (1) The unconformities are often overlaid on the Sinian moraine layers (Luozha Formation, Sandaozhuang Formation,