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Legend (cgs_services/Aquifer_Study_Douglas_County)

Township for Douglas County area (2)
Faults, approximately located (3)
Normal (known, approximated, & inferred) Normal (known, approximated, & inferred)
Reverse (known,approximated, & inferred) Reverse (known,approximated, & inferred)
Not Defined (concealed, approximated, & inferred) Not Defined (concealed, approximated, & inferred)
Fault_Displacement (indicated downthrown side of fault) (4)
Douglas County Boundary (5)
Quaternary Units Undifferentied (6)
Alluvial Aquifer wells (8)
Elevation of bedrock contact base of the alluvium (feet, MSL) (9)
50 foot contour interval 50 foot contour interval
Alluvium (10)
Upper Dawson Aquifer wells (permit designation) (12)
Estimated groundwater flow direction in the Upper Dawson Aquifer (13)
Dawson Arkos base elevation (feet, MSL) (14)
500 ft contour, with control 500 ft contour, with control
100 ft contour, with control 100 ft contour, with control
Dawson Arkose intersecting alluvium (15)
Dawson Arkose extent (16)
Dawson Arkose, outcrop Dawson Arkose, outcrop
Dawson Arkose, concealed Dawson Arkose, concealed
Dawson Arkose base depth (feet below ground) (17)
< 500 < 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
Lower Dawson Aquifer wells (permit designation) (19)
Estimated groundwater flow direction in the Lower Dawson Aquifer (20)
D1 upper fan base elevation (feet, MSL) (21)
500 ft contour, with control 500 ft contour, with control
100 ft contour, with control 100 ft contour, with control
D1 upper fan intersecting alluvium (22)
D1 upper fan extent (23)
D1 upper fan, outcrop D1 upper fan, outcrop
D1 upper fan, concealed D1 upper fan, concealed
D1 upper fan extentbase depth (feet below ground) (24)
< 500 < 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
Denver Aquifer wells (permit designation) (26)
Estimated groundwater flow direction in the Denver Aquifer (27)
Denver Aquifer base elevation [DWR] (feet, MSL) (28)
500 ft contour, with control 500 ft contour, with control
100 ft contour, with control 100 ft contour, with control
D1 middle unit intersecting alluvium (29)
D1 middle unit extent (30)
D1 middle unit, outcrop D1 middle unit, outcrop
D1 middle unit, concealed D1 middle unit, concealed
Denver Aquifer base depth (feet below ground) (31)
< 500 < 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
2,000 - 3,500 2,000 - 3,500
Arapahoe_Aquifer_wells (permit designation) (33)
D1 lower fan base elevation (feet, MSL) (34)
500 ft contour, with control 500 ft contour, with control
500 ft contour, dashed where inferred 500 ft contour, dashed where inferred
100 ft contour, with control 100 ft contour, with control
100 ft contour, dashed where inferred 100 ft contour, dashed where inferred
Estimated groundwater flow direction in the Arapahoe Aquifer (35)
D1 lower fan intersecting alluvium (36)
D1 lower fan extent (37)
D1 lower fan, outcrop D1 lower fan, outcrop
D1 lower fan, concealed D1 lower fan, concealed
D1 lower fan base depth (feet below ground) (38)
< 500 < 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
2,000 - 2,500 2,000 - 2,500
2,500 - 3,000 2,500 - 3,000
3,000 - 3,500 3,000 - 3,500
Laramie Formation wells (40)
Laramie Fox Hills wells (41)
Estimated groundwater flow direction in the Laramie Fox Hills Aquifer (42)
Fox Hills Sandstone top elevation (feet, MSL) (43)
500 ft contour, with control 500 ft contour, with control
500 ft contour, dashed where inferred 500 ft contour, dashed where inferred
100 ft contour, with control 100 ft contour, with control
100 ft contour, dashed where inferred 100 ft contour, dashed where inferred
Laramie Fox Hills intersecting alluvium (44)
Laramie Fox Hills extent (45)
Laramie Formation, outcrop Laramie Formation, outcrop
Laramie-Fox Hills, concealed Laramie-Fox Hills, concealed
Fox Hills Sandstone, outcrop Fox Hills Sandstone, outcrop
Fox Hills Sanstone top depth (feet below ground) (46)
< 500 < 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
2,000 - 2,500 2,000 - 2,500
2,500 - 3,000 2,500 - 3,000
3,000 - 3,500 3,000 - 3,500
Niobrara Formation wells (48)
Pierre Shale wells (49)
Cretaceous marine shale unit intersecting alluvium (50)
Cretaceous marine shale (51)
Pierre Shale, outcrop Pierre Shale, outcrop
Pierre Shale, concealed Pierre Shale, concealed
Niobrara Formation, outcrop Niobrara Formation, outcrop
Niobrara Formation, concealed Niobrara Formation, concealed
Benton Group, outcrop Benton Group, outcrop
Benton Group, concealed Benton Group, concealed
Cretaceous marine shale unit, concealed and extending to depths over 3,500 feet Cretaceous marine shale unit, concealed and extending to depths over 3,500 feet
Dakota Aquifer wells (53)
Estimated groundwater flow direction in the Dakota Aquifer (54)
Elevation of the Dakota Aquifer base (feet, MSL) (55)
500 ft contour, with control 500 ft contour, with control
500 ft contour, dashed where inferred 500 ft contour, dashed where inferred
100 ft contour, with control 100 ft contour, with control
100 ft contour, dashed where inferred 100 ft contour, dashed where inferred
Dakota aquifer intersecting alluvium (56)
Dakota Aquifer extent (57)
Dakota Aquifer outcrop Dakota Aquifer outcrop
Dakota Aquifer concealed, outcrop Dakota Aquifer concealed, outcrop
Dakota Aquifer concealed, no outcrop Dakota Aquifer concealed, no outcrop
Dakota Aquifer depth (feet below ground) (58)
< 500 < 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
2,000 - 2,500 2,000 - 2,500
2,500 - 3,000 2,500 - 3,000
3,000 - 3,500 3,000 - 3,500
> 3,500 > 3,500
Triassic-Jurassic unit wells (60)
Triassic-Jurassic unit extent (61)
Morrison Formation, outcrop Morrison Formation, outcrop
Lykins Formation, outcrop Lykins Formation, outcrop
Triassic-Jurrasic , concealed Triassic-Jurrasic , concealed
Lyons-Fountain Aquifer wells (63)
Estimated groundwater flow direction in the Lyons-Fountain Aquifer (64)
Elevation of the Lyons-Fountain base (feet, MSL) (65)
500 foot contour interval, with control 500 foot contour interval, with control
500 foot contour interval, dashed where inferred 500 foot contour interval, dashed where inferred
100 foot contour interval, with control 100 foot contour interval, with control
100 foot contour interval, dashed where inferred 100 foot contour interval, dashed where inferred
Lyons-Fountain Aquifer extent (66)
Lyons-Fountain Aquifer, outcrop Lyons-Fountain Aquifer, outcrop
Lyons-Fountain Aquifer, concealed Lyons-Fountain Aquifer, concealed
Lyons-Fountain Aquifer intersecting alluvium (67)
Depth of Lyons-Fountain Aquifer (feet below ground) (68)
< 500 < 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 2,000 1,500 - 2,000
2,000 - 2,500 2,000 - 2,500
2,500 - 3,000 2,500 - 3,000
3,000 - 3,500 3,000 - 3,500
> 3,500 > 3,500
Older Paleozoic unit wells (70)
Elevation of the Older Paleozoic unit base (feet, MSL) (71)
500 foot contour interval, dashed where inferred 500 foot contour interval, dashed where inferred
100 foot contour interval, dashed where inferred 100 foot contour interval, dashed where inferred
Estimated groundwater flow direction in the Older Paleozoic units (72)
Older Paleozoic unit extent (73)
Older Paleozoic unit, outcrop Older Paleozoic unit, outcrop
Older Paleozoic unit, concealed Older Paleozoic unit, concealed
Older Paleozoic unit intersecting alluvium (74)
Depth of the Older Paleozoic unit (feet below ground) (75)
< 500 < 500
500 - 1,000 500 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 3,500 1,500 - 3,500
Igneous rocks wells (77)
Matamorphic rocks wells (78)
Fractured Crystalline rock Aquifer extent (79)
Mesoproterozoic igneous rocks, outcrop Mesoproterozoic igneous rocks, outcrop
Mesoproterozoic igneous rocks, concealed Mesoproterozoic igneous rocks, concealed
Paleoproterozoic igneous rocks, outcrop Paleoproterozoic igneous rocks, outcrop
Paleoproterozoic igneous rocks, concealed Paleoproterozoic igneous rocks, concealed
Paleoproterozoic metamorphic rocks, outcrop Paleoproterozoic metamorphic rocks, outcrop
Paleoproterozoic metamorphic rocks, concealed Paleoproterozoic metamorphic rocks, concealed