论山东中寒武统徐庄组与张夏组界线的三种类型

THREE TYPES OF BOUNDARY LINE BETWEEN THE MID-CAMBRIAN XUZHUANG FORMATION AND ZHANGXIA FORMATION IN SHANDONG

摘要:

中寒武统徐庄组、张夏组建组剖面位于山东长清张夏—崮山一带。两组界线是划在三叶虫带Bailiella带与Liaoyangaspis带之间。而反应到岩性界线上却表现出三种不同的类型:Ⅰ.页岩—灰岩型;Ⅱ.灰岩—灰岩型;Ⅲ.灰岩—页岩型。并简要地列述了区域上的分布状况。同时结合局系统所开展的区调工作,指出岩性组图中的“张夏组一段”具有明显的穿时现象。

Abstract:

The profile on which the Mid--cambrian Xuzhuang and Zhangxia formations are established lies around Zhangxia--Gushan of Changqing County. The boundary line is drawn between the trilobite belt of Bailiella and that of Liaoyangaspis, which is reflected by three different types of lithological boundaries, i. e. Ⅰ. shale--limestone; Ⅱ. limestone--limestone; Ⅲ. limestone--shale. Their regional distribution is also described briefly. It is pointed out that the first member of "Zhangxia Formation" in the lithologi...