Aquifer Susceptibility of the Deadwood Formation, Piedmont Quadrangle By

(D E A A.L. Lisenbee, A.D. Davis, and M.H. Price D M A N ) M 2011 E O S U E N D T A A E IN M ) o 27'30" 25' T 6 000m. 6 6 6 6 (TILFORD) 6 6 6 6 o R 103 30' 103 22'30" O 20 E. 21 22 23 24 26 27 28 29 F o R. 5 E. R. 6 E. ( 44 15' o Qal 44 15' E lk

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N Qt o rt OCd h AA rr ee aa 4888 Qal B o 48 x 88 B el Qt Qt o de g Qt r us 15 14 13 18 17 16 15 Jim Qt C r OCd e e eek Boxelder iddle Bo k Cr M gus Gravel Jim OCd Creek Cre Spring 48 ek 87 Bogus Jim Doty Spring 48 000m. OCd Qal 87 N. Creek 44o 07' 30" 44o 07' 30" 6 o R. 5 E. R. 6 E. 25 103 30' 6 6 6 6 6 6 6 6 000m. o ) 21 22 23 24 26 27 28 29 E. 103 22'30" (R Y 27'30" 25' A IT (PACTOLA DAM) P C ID R C E I V T IL Map base modified from U.S.G.S. 1:24,000-scale Piedmont digital line graph. Y S NORTH W ( REFERENCE SCALE 1:24,000 E Geology layer from J.A. Redden, 2006. S 1 0.5 0 1 ^ T Water well data digitized from SD Dept. of Environment Miles ) & Natural Resources "Online Oil/Gas/Injection Well Data" database. MN GN South Dakota Projection is Universal Transverse Mercator, Zone 13, North American Datum 1983. 1,000 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 Digital Cartography: K.M. Grigg and S.L. Saxton, 2011. Feet

o Department of Geology and Geological Engineering 1 0.5 0 1 13 Kilometers o South Dakota School of Mines and Technology 1 10' 231 MILS 21 MILS TOPOGRAPHIC CONTOUR INTERVAL 20 FEET Quadrangle location (IF SHOWN)

UTM GRID AND 1971 MAGNETIC NORTH DECLINATION AT CENTER OF SHEET The preparation of this map was funded by the West Dakota Water Development District in association with the Department of Geology and Geological Engineering South Dakota School of Mines and Technology

Definition of Susceptibility Aquifer susceptibility is the inherent ability of a formation to accept and transmit liquids EXPLANATION Geologic Units (potentially including contaminants). Floodplain Surficial Deposits Contact Quaternary

Solid where location certain; dashed where Includes alluvium (Qal) deposits. Increased potential for

Susceptibility Ranges for Hydrogeologic Units approximately located. infiltration of water. High ; Hydrogeologic Units Low Medium Very High Fault ? Solid where location certain; dashed where Quaternary/ Other Surficial Deposits approximately located; queried where uncertain. Includes colluvium (Qc) and terrace deposits (Qt, Qt1). Bar and ball on downthrown side. Tertiary Decreased potential for infiltration of water. Deadwood Aquifer Recharge Area 8 - 16 Anticline H F Showing crestline and direction of plunge. Unconformity Deadwood aquifer by terrace deposits 13 - 26 Solid where location certain; dashed where approximately located. Ordivician/ Deadwood Formation OCd Saturated alluvium over Deadwood aquifer 3 - 8 Syncline Cambrian Susceptibility rating ranges between 24 to 37. H M Showing troughline and direction of plunge. Solid where location certain; dashed where approximately located. 0 5 10 15 20 25 30 35 40 45 50 55 60 65 Deadwood Formation Absent Summary of ratings associated with the Deadwood aquifer. Number falling within the range area indicates the qualitative rating for aquifer susceptibility (adapted from Hargrave, 2005). Black Hills National Forest Boundary Susceptibility Ratings Explanation: The susceptibility range is the sum of ratings for susceptibility parameters of the aquifer. The parameters used for the Deadwood aquifer are rock type, overlying material, Deadwood Formation Present in Subsurface and joints affecting the hydrogeologic units of the Deadwood Fm. The ratings for these parameters are: Rock Type; 5-8 for sandstone; Overlying Material; 5-10 for alluvium and negative 5-10 for gravel, sand and clay mixture and Joints; 5-7. The ratings suggested for the parameters are from Aller et al. (1987) and Davis et al., (1994.)