Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Tennessee Geology
Geologic units in Shelby county, Tennessee
- Alluvial deposits (Quaternary) at surface, covers 20 % of this area
Alluvial Deposits - Sand, silt, clay, and gravel. In flood plain of Mississippi River more than 100 feet thick; in smaller streams generally less than 20 feet thick.
- Jackson (?) Formation (Tertiary) at surface, covers 0.7 % of this area
Jackson (?) Formation - Sand, with layers of gray clay, silt, and lignite. Exposed only in bluffs along Mississippi River; thickness at least 60 feet.
- Loess (Quaternary) at surface, covers 75 % of this area
Loess - Clayey and sandy silt, gray to brown, massive. Maximum thickness about 100 feet along bluffs of Mississippi River; thins eastward. (Minimum mapped thickness 4 feet.)
- Alluvium - Alluvial deposits in major stream channels or in mappable meanders of major streams (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.3 % of this area
Alluvial deposits in major stream channels or in mappable meanders of major streams - Includes alluvial deposits in natural levees in some areas.