Jefferson County - East-West Gateway Coordinating Council

4
Jefferson County – Section 1
predominantly limestone and cherty limestone. The limestone weathers easily and
produces deep cherty soils (in the northeastern part of the county). The Pennsylvanian
system consists of reddish-brown sandstone and bluish-gray to purple shale found in
sinkholes and vertical bedrock joints. Geologic units consist of flat to gently dipping
bedrock dominated by dolostone, sandstone and limestone formations. Northwestsoutheast
trending folds and faults where bedrock dip is over ten degrees has altered a
slight regional dip of one to two degrees to the northeast. Several zones of high angle
faults that are downthrown are considered to be extensions of the Ste. Genevieve Fault
System. They are the Crystal City anticline, the Plattin Creek anticline, the Roselle
lineament, the Rugley School fault block, the Summit Park structure and the Valles Mines-
Vineland fault zone. A structure known as the Eureka-House Springs anticline has been
traced from the Mississippi River to near Wright City (McCracken, 1971). The potential for
landslide or slump occurs in areas of the Maquoketa and Warsaw shales. Sinkholes are
numerous in the Kimmswick limestone. Refer to Figure J3 below.
FIGURE J3 GEOLOGIC MAP OF MISSOURI
Source: Missouri Department of Natural Resources
Soils - There are a total of six soil associations in Jefferson County including the Haynie-
Tice-Waldron Association, the Sonsac-Useful Association, the Wrengart-Goss Association,
the Menfro-Gasconade Association, the Minnith-Pevely Association, and the Haymond-
Freeburg-Horsecreek-Bloomdale Association.
The Haynie-Tice Waldron Association includes zero to two percent slopes, formed in
Mississippian River alluvium. It covers one percent of the county and is present mainly on
natural levees, bottomlands and old meanders. It consists of 48 percent well drained
Haynie soils (silty loam), 29 percent somewhat poorly drained Tice soils (silty loam), 20
percent somewhat poorly drained Waldron soils (silty loam) and three percent minor soils.