The petrology revelas that the sedimentary environment of the study area is carbonate tide-flat and shallow sea which is上述岩石特徵表明，研究区在中元古代蓟县纪早期的杨庄期为浅海─潮坪碳酸盐沈积环境，沈积作用受中远源火山物质和风携碎屑的强烈影响。