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蓟县北部山区居燕山中段南翼,以我国北方震旦纪地层发育著称。本区地质屡经地质工作者调查研究,唯第四纪地质至今尚少人注意。随着我国社会主义农业的发展,兴修水利工程,特别是山区寻找地下水源,都需要着重解决第四纪地质问题。 1974年春和1975年夏,我们先后两次在本区下营、小港等地进行调查,发现一些丘陵顶部黄土层之下埋藏着一种具有冰川作用痕迹的泥砾层,引起了我们的注意。两年来,
Jixian County in northern mountain Yanshan middle of the southern wing of the Northern China Sinian strata known for its development. Geological geological survey in this area by repeated geological workers, only the Quaternary geology is still less attention. With the development of socialist agriculture in our country and the construction of water conservancy projects, especially in mountainous areas, it is necessary to focus on solving the Quaternary geological problems. In the spring of 1974 and the summer of 1975, we conducted two surveys in this area and twice in Xiaogang to find out that some mud gravels with traces of glaciation buried under some loess hilly layers caught our attention. Two years ago,