Legend (Marion_County_Geology_Package)

Water Wells (iLITH) (0) Potentiometric Surface - Shallow Aquifer System (1) 650 660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 810 820 830 840 850 860 870 880 <all other values> Hydrogeologic Settings - Shallow Aquifer System (2) A1-Unconfined sand and gravel with scattered till units A2-Interbedded sand and gravel and till A3-Narrow bands of interbedded sand/gravel and till in valleys B1-Hummocky ridges of sand/gravel and till B2-Hummocky ridges of till with some sand/gravel C1-Sand and gravel capped by <10 ft of till C2-Sand and gravel capped by >10 ft of till C3-Wisconsin till containing small lenses of sand/gravel C4-Small valleys formed in till with some sand/gravel C5-Sandstone overlain by <20 ft of glacial sediments C6-Small valleys underlain by <20 ft of glacial sediments C7-Slope underlain by <20 ft of till overlying sand/gravel C8-Very sparse data, evaluate locally <all other values> Clay Thickness (ILITH) - Points (IN) (3) 0.000000 - 86.000000 86.000001 - 149.000000 149.000001 - 255.000000 255.000001 - 720.000000 720.000001 - 3125.000000 Clay Thickness (ILITH) - Points (4) 0.000000 - 66.000000 66.000001 - 118.500000 118.500001 - 190.000000 190.000001 - 316.000000 316.000001 - 1137.000000 Clay Thickness (ILITH) - Grid (5) 264.798 - 0.0757396 Unconsolidated Thickness - Contours (6) 50 100 150 200 250 300 <all other values> Unconsolidated Thickness - Grid (7) 323.965 - 8.015 Glacial Terrain - Channels/Ice Margins (8) l1 l2 l3 l5 l6 l8 l9 <all other values> Glacial Terrain - Mound Features (9) Prominent mounds of till with some sand/gravel Prominent mounds of sand/gravel with some till Linear bodies of ice-contact sand/gravel <all other values> Glacial Terrain - Dominant Sediment (10) Sand- and gravel-dominated sequences Mixed sequences Till-dominated sequences <all other values> Landforms Associated with Map Units (11) Alluvium,High-level valleys Alluvium,Small valleys or valley complexes Alluvium,Valley segments Outwash Associations,Deep locally gorgelike stream valleys Outwash Associations,Medium to large deeply entrenched sluiceways Outwash Associations,Small to large hummocks and ridges, relief ranges from 25 to more than 100 ft Outwash Associations,White River Valley sluiceway Outwash Associations,White River Valley sluiceway fringe east side; generally a fluvially washed landscape Outwash Associations,White River Valley sluiceway fringe west side; generally a flat fluvially streamlined landscape Trafalgar Formation,Hummocky to irregular morainal ridges; relief averages 30 to 50 ft (max = 80 ft) Trafalgar Formation,Low- to moderate-relief hummocks and ridges Trafalgar Formation,Massive broad crested morainal ridges; relief ranges from 20 to more than 75 ft Trafalgar Formation,Massive steep sharp-topped ridges; total relief generally 125 ft or more Trafalgar Formation,Rolling to strongly sloping surfaces that are graded to the White River Valley Trafalgar Formation,Smooth till surface of low relief, relief is typically 5 ft or less Trafalgar Formation,Smooth till surface of low relief, relief ranges between 5 and 10 ft <all other values> Bedrock Topography - Contours (12) 550 600 650 700 750 800 <all other values> Bedrock Topography - Grid (13) 808.288 - 505.314 Bedrock Geology (14) Muscatatuck Group New Providence Shale Pleasant Mills Formation Rockford Limestone and New Albany Shale Upper Borden Group Wabash Formation <all other values>