topography
The strata in Weifang city are well developed, and Archean and Proterozoic metamorphic rocks constitute the crystalline basement of the east and west blocks. Paleozoic and Mesozoic were not integrated on the ancient crystalline basement on both sides respectively; Cenozoic formed fault basins, intermontane basins, fluvial and lacustrine facies and coastal facies. The stratum in the area under its jurisdiction belongs to the stratum area of North China.
The Changyi-Dadian fault in the Yishu fault zone in Shandong Province is divided into two stratigraphic divisions: eastern Shandong and western Shandong. The stratigraphic development of the two sub-zones is very different, and the Yishu fault zone is similar to the Luxi fault zone, but there are also differences.
Weifang City is located in the northeast of Luxi Strata Belt, including the eastern edge of Weifang Community and Taian Community, and the western end of Ludong Strata Belt, including the western part of Penglai, Laiyang and Jiaonan Strata Belt. The municipal district spans two uplift areas in eastern Shandong and western Shandong and three secondary structural units with different structures, forming a pattern of structural diversity and complexity in this area.
The urban landscape of Weifang forms several steps from north to south and from low to high. Generally, it can be divided into three landform areas: lowlands, plains and low hills. 18 landform type. It borders Laizhou Bay in Bohai Sea in the north and salt water line in the south. Covered by marine sediments and river alluvium, the terrain is low and flat.
Below 7 meters above sea level, the area is 263 1.9 1 km2, accounting for 15% of the city's total area. Since modern times, the phenomenon of ocean meeting has attracted attention. Due to the dynamic action of waves and tides, a large area of marine strata has been accumulated, forming marine plains and swamps slightly inclined to the coast. The layered structure is obvious and contains a lot of organic matter and biological shells. ?
Reference to the above content: Baidu Encyclopedia-Weifang