T. 105 N.
T. 105 N.
T. 106 N.
T. 106 N.
T. 107 N.
T. 107 N.
T. 108 N.
T. 108 N.
T. 109 N.
T. 109 N.
R. 25 W.
R. 25 W.
R. 26 W.
R. 26 W.
R. 27 W.
R. 27 W.
R. 28 W.
R. 28 W.
R. 29 W.
R. 29 W.
DANVILLEMAPLETONSTERLINGSHELBY
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94° W.
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94°15' W.
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FARIBAULT COUNTYFARIBAULT COUNTY
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GEOLOGIC ATLAS OF BLUE EARTH COUNTY, MINNESOTA
This map was compiled and generated in a geographic information
system (GIS). Digital data products, including chemistry and
geophysi-cal data, are available from the DNR Ecological and Water
Resources Division at http://www.mndnr.gov/waters.This map was
prepared from publicly available information only. Every reasonable
effort has been made to ensure the accuracy of the factual data on
which this map interpretation is based. However, the Depart-ment of
Natural Resources does not warrant the accuracy, completeness, or
any implied uses of these data. Users may wish to verify critical
information; sources include both the references in the report and
information on file in the offices of the Minnesota Geological
Survey and the Minnesota Department of Natural Resources. Every
effort has been made to ensure the interpretation shown conforms to
sound geologic and cartographic principles. This map should not be
used to establish legal title, boundaries, or locations of
improvements.Base modified from Minnesota Geological Survey, Blue
Earth County Geologic Atlas, Part A, 2012.Universal Transverse
Mercator projection, zone 15N, North American Datum of 1983. North
American Vertical Datum of 1988.GIS and cartography by James A.
Berg, Shana Pascal, and Holly Johnson. Edited by Carrie Jennings
and Ruth MacDonald.
STATE OF MINNESOTADEPARTMENT OF NATURAL RESOURCESECOLOGICAL AND
WATER RESOURCES DIVISION
COUNTY ATLAS SERIESBLUE EARTH COUNTY
ATLAS C-26, PART B, PLATE 7 of 9Bedrock Groundwater Flow
Directions
Prepared and Published with the Support of the MINNESOTA
ENVIRONMENT AND NATURAL RESOURCES TRUST FUND and the CLEAN WATER,
LAND AND LEGACY AMENDMENT
Uppermost Bedrock Groundwater Flow Directions and Bedrock
Geology
By James A. Berg
2016
The DNR Information Center
Minnesota Department of Natural ResourcesEcological and Water
Resources Division500 Lafayette RoadSt. Paul, MN 55155-4025For more
information call 651-296-6157 or
888-646-6367http://www.mndnr.gov/waters
This information is available in alternative format on
request.
The Minnesota DNR prohibits discrimination in its programs
andservices based on race, color, creed, religion, national
origin,sex, public assistance status, age, sexual orientation, or
disability.Persons with disabilities may request reasonable
modifications toaccess or participate in DNR programs and services
by contactingthe DNR ADA Title II coordinator at
[email protected] or651-259-5488. Discrimination inquiries
should be sent to MinnesotaDNR, 500 Lafayette Road, St. Paul, MN
55155-4049; or Officeof Civil Rights, U.S. Department of the
Interior, 1849 C St. NW,Washington, DC 20240.
© 2016, State of Minnesota, Department of Natural Resources and
the Regents of the University of Minnesota.
LOCATION DIAGRAM
s2
su
st
sm
se
Sampled well and aquifer symbolsPrairie du Chien
Prairie du Chien–Jordan
Jordan
St. Lawrence
St. Lawrence and Upper Tunnel City
St. Lawrence, Upper Tunnel City, and Wonewoc
Upper Tunnel City
Upper Tunnel City and Wonewoc
Mt. Simon
Upper Tunnel City, Wonewoc, and Mt. Simon
Recent: water entered the ground since about 1953 (8 to 15
tritium units [TU]).
Mixed: water is a mixture of recent and vintage waters (greater
than 1 TU to less than 8 TU).
Vintage: water entered the ground before 1953 (less than or
equal to 1 TU).
Well was not sampled for tritium.
Tritium ageSymbol color indicates tritium age of water
sampled.
Symbols and labelsIf shown, arsenic concentration equals or
exceeds 5 parts per billion.
10.3
If shown, chloride concentration equals or exceeds 5 parts per
million.
9.4
If shown, nitrate-nitrogen concentration equals or exceeds 1
part per million.
9.7
If shown, groundwater residence time in years, estimated by
carbon-14 (14C) isotope analysis
29,000
Groundwater conditions
Groundwater moves from an overlying surficial aquifer to a
buried aquifer
Groundwater moves from an overlying buried aquifer to an
underlying buried aquifer
Groundwater discharge from a buried aquifer to surface water
Groundwater flows laterally
Groundwater flowpath is unknown (deep ground-water with recent
or mixed tritium age)
Line of cross sectionStatic water level dataSurface-water
sample
(Some conditions shown are interpreted and do not correspond to
tritium data locations.)
St. Lawrence Formation*_sl
Eau Claire Formation*_e
Oo Oneota Dolomite (Prairie du Chien)*
Bedrock aquifers and aquitardsPlatteville-Glenwood
formations¹
Tunnel City_tc
Wonewoc_w
Mt. Simon1The Glenwood Formation acts as an aquitard but the
overlying Platteville Formation is a thin aquifer. Combined, these
units are shown as an aquitard.*aquitard
_m
Shakopee (Prairie du Chien)
St. Peter
Jordan
Opg
Os
Osp
_j
1 0 1 2 3 4 5 MILES
1 0 1 2 4 5 6 7 83 9 KILOMETERS
SCALE 1:100 000
Groundwater flow directionUpper geologic units (St. Peter
Sandstone, Prairie du Chien Group, and Jordan Sandstone)Lower
geologic units (St. Lawrence Formation, Tunnel City Group, Wonewoc
Sandstone, Eau Claire Formation, and Mt. Simon Sandstone)
Potentiometric surface contour(dashed where approximate)
Upper geologic units (St. Peter Sandstone, Prairie du Chien
Group, and Jordan Sandstone)
Lower geologic unit (Tunnel City Group, Wonewoc Sandstone, Eau
Claire Formation, and Mt. Simon Sandstone)
940
940
Fractured aquitard (St. Lawrence Formation and Eau Claire
Formation)
940
