Burton Township Land Use Plan - 7Aa Glacial Till Over Bedded Sedimentary Rock

7Aa Glacial Till Over Bedded Sedimentary Rock

This hydrogeologic setting is characterized by high relief with prominent, steep-sided ridges, and by relatively flat-lying, fractured sedimentary rocks. The rocks are predominantly sandstones with thin, inter-layered coals and shale that are covered by varying thickness of glacial till. The thin coal seams are usually highly fractured and are quite permeable. Thin clay and shale zones tend to impede vertical water movement and create "perched" water tables. The till is basically an unsorted deposit that contains localized deposits of sand and gravel. Although precipitation is abundant in the region, recharge is generally moderate due to the relatively high depth to water (low water table) and the corresponding thick vadose zone comprised of compacted till. Depth to water is variable, but generally ranges between 25 and 50 feet.