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Legend (Water/ON_008_07_Dakota_Aquifer_Map_of_Colorado)

Faults in the extent of the Dakota Group (2)
In the subsurface on the Dakota top In the subsurface on the Dakota top
Mapped at ground surface Mapped at ground surface
Folds in the extent of the Dakota Group (3)
Anticline in the subsurface on the Dakota top Anticline in the subsurface on the Dakota top
Anticline mapped at ground surface Anticline mapped at ground surface
Syncline in the subsurface on the Dakota top Syncline in the subsurface on the Dakota top
Syncline mapped at ground surface Syncline mapped at ground surface
Paleogene-Cretaceous Intrusive Bodies (4)
Structure contours, top of Dakota Group (6)
500 ft MSL 500 ft MSL
1000 ft MSL 1000 ft MSL
Intersection of the Dakota Group with alluvial aquifer (8)
Dakota Group outcrop belt (9)
Extent of the Dakota Group top (10)
Extent of the Dakota Group base (11)
Depth to the top of the Dakota Group (13)
<0 <0
0 - 200 0 - 200
200 - 400 200 - 400
400 - 600 400 - 600
600 - 800 600 - 800
800 - 1,000 800 - 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 - 4,000 3,000 - 4,000
Depth to the base of the Dakota Group (14)
<0 <0
0 - 200 0 - 200
200 - 400 200 - 400
400 - 600 400 - 600
600 - 800 600 - 800
800 - 1,000 800 - 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 - 4,000 3,000 - 4,000
Geologic Domains (15)
Arkansas River Basin-Water Division 2 (17)
Method (18)
Interpretation of oil and gas well logs Interpretation of oil and gas well logs
Surface exposures and permitted water well geologic logs Surface exposures and permitted water well geologic logs
Faults in the extent of the Dakota Group (20)
With sense of displacement, Down To... With sense of displacement, Down To...
Folds in the extent of the Dakota Group (21)
Anticline Anticline
Monocline Monocline
Monocline, uncertain Monocline, uncertain
Syncline Syncline
Neogene-Paleogene Intrusive Bodies (22)
Geologic Domains (23)
Apishapa Uplft-Wet Mtns Apishapa Uplft-Wet Mtns
Apishapa Uplift flank Apishapa Uplift flank
Canyn City Embayment Canyn City Embayment
Denver Basin Denver Basin
Denver Basin Egde Denver Basin Egde
Guffy Block Guffy Block
High Plains High Plains
Huerfano Basin Huerfano Basin
Hugoton Embayment Hugoton Embayment
Las Animas Arch Las Animas Arch
Raton Basin Raton Basin
Raton Basin Edge Raton Basin Edge
Sierra Grande Uplift Sierra Grande Uplift
<all other values> <all other values>
Structure contours, base of Greenhorn aquifer (26)
100 ft MSL 100 ft MSL
500 ft MSL 500 ft MSL
1000 ft MSL 1000 ft MSL
Depth to top of Greenhorn aquifer (27)
0 - 199 0 - 199
200 - 399 200 - 399
400 - 599 400 - 599
600 - 799 600 - 799
800 - 999 800 - 999
1,000 - 1,499 1,000 - 1,499
1,500 - 1,999 1,500 - 1,999
2,000 - 2,499 2,000 - 2,499
2,500 - 2,999 2,500 - 2,999
3,000 - 3,999 3,000 - 3,999
>4,000 >4,000
Depth to base of Greenhorn aquifer (28)
0 - 199 0 - 199
200 - 399 200 - 399
400 - 599 400 - 599
600 - 799 600 - 799
800 - 999 800 - 999
1,000 - 1,499 1,000 - 1,499
1,500 - 1,999 1,500 - 1,999
2,000 - 2,499 2,000 - 2,499
2,500 - 2,999 2,500 - 2,999
3,000 - 3,999 3,000 - 3,999
>4,000 >4,000
Extent of Greenhorn aquifer base (29)
Intersection of the Dakota Group with alluvial aquifer (32)
Dakota Sandstone Dakota Sandstone
Kiowa Shale Kiowa Shale
Cheyenne Sandstone Cheyenne Sandstone
Dakota Group Outcrop (33)
Dakota Sandstone Dakota Sandstone
Kiowa Shale Kiowa Shale
Cheyenne Sandstone Cheyenne Sandstone
Structure contours, top of Dakota Sandstone (36)
100 ft MSL 100 ft MSL
500 ft MSL 500 ft MSL
1000 ft MSL 1000 ft MSL
Structure contours, base of Dakota Sandstone (37)
100 ft MSL 100 ft MSL
500 ft MSL 500 ft MSL
1000 ft MSL 1000 ft MSL
Depth to top of Dakota Sandstone (39)
0 - 199 0 - 199
200 - 399 200 - 399
400 - 599 400 - 599
600 - 799 600 - 799
800 - 999 800 - 999
1,000 - 1,499 1,000 - 1,499
1,500 - 1,999 1,500 - 1,999
2,000 - 2,499 2,000 - 2,499
2,500 - 2,999 2,500 - 2,999
3,000 - 3,999 3,000 - 3,999
>4,000 >4,000
Depth to base of Dakota Sandstone (40)
0 - 199 0 - 199
200 - 399 200 - 399
400 - 599 400 - 599
600 - 799 600 - 799
800 - 999 800 - 999
1,000 - 1,499 1,000 - 1,499
1,500 - 1,999 1,500 - 1,999
2,000 - 2,499 2,000 - 2,499
2,500 - 2,999 2,500 - 2,999
3,000 - 3,999 3,000 - 3,999
>4,000 >4,000
Extent of Dakota Sandstone top (42)
Extent of Dakota Sandstone base (43)
Dakota Sandstone thickness (45)
< 40 < 40
40 - 60 40 - 60
60 - 80 60 - 80
80 - 100 80 - 100
100 - 120 100 - 120
120 - 140 120 - 140
140 - 160 140 - 160
160 - 180 160 - 180
180 - 200 180 - 200
200 - 220 200 - 220
220 - 240 220 - 240
Structure contours, base of Cheyenne Sandstone (48)
100 100
500 500
1000 1000
Depth to top of Cheyenne Sandstone (50)
0 - 199 0 - 199
200 - 399 200 - 399
400 - 599 400 - 599
600 - 799 600 - 799
800 - 999 800 - 999
1,000 - 1,499 1,000 - 1,499
1,500 - 1,999 1,500 - 1,999
2,000 - 2,499 2,000 - 2,499
2,500 - 2,999 2,500 - 2,999
3,000 - 3,999 3,000 - 3,999
>4,000 >4,000
Depth to base of Cheyenne Sandstone (51)
0 - 199 0 - 199
200 - 399 200 - 399
400 - 599 400 - 599
600 - 799 600 - 799
800 - 999 800 - 999
1,000 - 1,499 1,000 - 1,499
1,500 - 1,999 1,500 - 1,999
2,000 - 2,499 2,000 - 2,499
2,500 - 2,999 2,500 - 2,999
3,000 - 3,999 3,000 - 3,999
>4,000 >4,000
Extent of Cheyenne Sandstone top (53)
Extent of Cheyenne Sandstone base (54)
Cheyenne Sandstone thickness (56)
< 20 < 20
20 - 40 20 - 40
40 - 80 40 - 80
80 - 100 80 - 100
100 - 120 100 - 120
120 - 140 120 - 140
140 - 160 140 - 160
160 - 180 160 - 180
180 - 200 180 - 200
200 - 220 200 - 220
Dakota Group Transmissivity (58)
Dakota Sandstone Dakota Sandstone
Cheyenne Sandstone Cheyenne Sandstone
CWCB Circular Dakota Aquifer Group Tests (59)
Dakota Sandstone Dakota Sandstone
Purgatoire Formation Purgatoire Formation
Dakota Sandstone Transmissivity (60)
20 - 200 20 - 200
200 - 400 200 - 400
400 - 800 400 - 800
800 - 1,000 800 - 1,000
1,000 - 1,500 1,000 - 1,500
1,500 - 3,000 1,500 - 3,000