Table Name |
Field Name |
Begin Column |
Definition |
Valid Values |
Descriptions |
Meekagppy.dbf |
Uq_id |
|
Number, 11 |
Values from 100 to 616. |
Unique identifier for
the field mapping units |
|
Fieldudesc |
|
Text, 100 |
e.g., Sand and Gravel - Low Potential; till
slope modified by outwash, Sands, silts and gravel over
collaspesed till- low relief. |
A short, summarized
description of the field mapping units. |
|
Sgeo_plB |
|
Text, 80 |
Listed below as
Sgeo_plb (Sgeo_lab), youngest units to oldest units. |
The surficial geologic
unit shown on Plate B. Mapping units may be glacial sediment, or modern
Holocene sediment. |
|
|
|
|
Alluvial Sediments
(Qav) |
Silt, fine sand, coarse sand, gravel, and clay layers overlying coarser sand and gravel layers and lenses. The sediment is generally moderately- to well-sorted and is interpreted to be alluvial overbank and stream bottom deposits. Within this unit, coarser sediment is typically found in abandoned and modern channels, point bars, and river bars. Alluvial sediments exist throughout the county in valleys, or in low-lying areas where drainage occurs as channelized flow. |
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|
|
|
Glaciolacustrine
Sediments (Qlu) |
Massive
silt, clay, or fine sand with interbeds of sandy silt, silt, and clay. The sediment is associated with the
ponding of glacial meltwater to form short-lived glacial lakes. Some of the
sediment is deposited in pre-existing meltwater valleys and may cover till
and thick outwash sediments. Other
glaciolacustrine sediments formed in lakes partially or entirely bounded by
ice. The largest deposits of sediment
are associated with the presence of stagnant ice that dammed glacial
meltwater and prevented it from flowing to the east. Therefore, lake margins
can be steeply walled to poorly defined.
Within the lake sediments are discontinuous channels and drainage
features that were created by the drainage of glacial meltwater. |
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|
|
|
Deltaic/Glaciolacustrine
Sediments (Qdl) |
Stratified
and massive silt and fine sand with interbedding of gravel, coarse sand,
sandy silt, silt, and clay. This
sediment is associated with the highest lake levels from the ponding of
glacial meltwater by stagnant ice.
This mapping
unit is deposited as a large, flat, sand plain. Steep slopes on the eastern edge of the
unit suggests stagnant ice partially bound the lake margin. Sediments grade into glaciolacustrine
sediments along the northern boundary of the mapping unit. |
|
|
|
|
Lake Modified Till Sediments
(Qdt) |
Thin,
discontinuous layers of sands, silts and clays mantling unsorted till
sediments (unsorted clay, silt, sand, gravel, cobbles, and boulders). The
sediment is interpreted to be till that has been modified by wave action of
water. Thicker accumulations of lake
sediment are found in the small depressions between till hummocks. This unit is interpreted to have formed by
the ponding of glacial meltwater over existing till sediments and is
associated with deltaic/lacustrine sediments. |
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|
|
|
Glaciofluvial Outwash
Sediments (Qoc) |
Stratified
coarse to fine sand, and gravel with layers of cobbles and small
boulders. The sediment is generally
rounded to well-rounded and moderately well- to very well-sorted. The sediment is associated with meltwater
of the Des Moines Lobe. The sediment
is located in meltwater channels and outwash plain features. Outwash sediment deposited proximal to the
glacial ice margin may be covered with supraglacial sediment and interstratified
with till. Within the meltwater channels,
the sediment is observed protruding from Holocene alluvial sediment. |
|
|
|
|
Glaciofluvial Outwash
Terrace Sediments (Qot) |
Stratified
fine to coarse sand and gravel, with layers of silt, fine sand, and cobbles
scattered throughout. The sediment is
rounded to well -rounded and moderately-well to very well sorted. The sediment was deposited in glacial
meltwater channels that range in width from 200 meters to 2000 meters. Generally, terraces within larger
meltwater channels are well defined, while, poorly defined terraces are often
located in smaller meltwater channels. |
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|
|
|
Outwash Modified Till
Sediments (Qmt) |
Thin,
discontinuous layers of fine to coarse sand and gravel, with occasional
layers of silt, fine sand, and cobbles.
The sediment mantles scoured, unsorted till sediments (unsorted clay,
silt, sand, gravel, cobbles and boulders), which may have produced a
pebble/cobble lag at the contact. The
sediment is interpreted to be till that has been modified by glacial
meltwater in or near outwash channels. |
|
|
|
|
Ice Contact Sediments
(Qic) |
Stratified
silt, fine sand, coarse sand, and gravel, with an occasional thick mantle of
glacial till. The sediment is rounded
to well-rounded and moderately-poor to moderately-well sorted. Associated with the Des Moines lobe, ice
contact sediments are typically deposited as features called eskers and
kames. Eskers are typically long,
narrow, sinuous ridges of stratified sand and gravel that were formed as
sub-glacial streams flowing between ice walls or in ice tunnels within
stagnant glacial ice, and were left behind as the ice melted. The kame features are low mounds, knobs,
hummocks, and small terraces also composed primarily of stratified sand and
gravel that were formed in holes or low areas on the ice surface. The smaller ice contact sediments were not
sorted as well as still contain a significant amount of silt and clay within
the sand and gravel. These sediments
can be found in the southern and eastern portions of the county. |
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|
Till- Ground Moraine
Sediments (Qtg) |
Mostly
unsorted and unstratified clay, silt, sand, gravel, cobbles, and
boulders. The sediment is clay-rich
and occasionally contains lenses and pockets of sorted silts, sands, and
gravels on top of and within the mapping unit. This till sediment (also called unsorted drift) was deposited
directly by and underneath the glacier, and subsequently has been slightly
reworked by ponded glacial meltwater behind and in front of the higher relief
of end moraines. The random melting of ice and deposition of material produced
a relatively flat to gently rolling, hummocky topography that is
characteristic of ground moraine.
Ground moraine sediments are located in the southern part of the
county.
|
|
|
|
|
Till- Cosmos End
Moraine Sediments (Qcm) |
Mostly
unsorted and unstratified clay, silt, sand, gravel, cobbles, and
boulders. The sediment occasionally
contains lenses and pockets of sorted silts, sands, and gravels on top of and
within the mapping unit. This till
sediment was deposited into a large, arcuate landform that marks a relatively
long-standing ice margin deposited by a small tongue of the Des Moines
Lobe. Meltwater was briefly ponded
between morainic ridges that make up the end moraine. End moraine sediments are located in the
southern part of the county. |
|
|
|
|
Till- Stagnant Ice
Moraine Sediments (Qts) |
Till
sediment (unsorted and unstratified clay, silt, sand, gravel, cobbles, with occasional
boulders) with pockets of sorted and stratified silt, sand, gravel, and
cobbles. This till sediment was
deposited beneath glacial ice, within glacial ice, and on top of glacial ice
and has been subsequently modified by gravity and meltwater. Stagnation ice
moraine sediments are interpreted to be the result of Des Moines Lobe ice
overriding and stagnating on top of stagnant ice of the Superior Lobe. Therefore, the rolling topography is
mostly related to Superior Lobe sediments buried by Des Moines Lobe till and
sorted sediments. |
|
|
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|
Till- Sandy Ground
Moraine Sediments (Qsm) |
Mostly
unsorted and unstratified clay, silt, sand, gravel, cobbles and
boulders. The sediment grades sandier
to the north and occasionally contains lenses and pockets of sorted silts,
sands, and gravels on top of and within the mapping unit. This till sediment was deposited by active
and stagnating ice. To the northeast, the sediment varies in thickness from
less than 2 feet to greater than 30 feet. Consequently, Superior Lobe
sediments are discontinuously exposed at the surface. The random melting of ice and deposition
of material produced a relatively flat to gently rolling, hummocky topography
that is characteristic of ground moraines.
This mapping unit is observed in the northern half of the county. |
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|
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|
Till- Hummocky Moraine
Sediments (Qsm) |
Mostly
unsorted and unstratified clay, silt, sand, gravel, cobbles and
boulders. The sediment occasionally
contains lenses and pockets of sorted silts, sands, and gravels on top of and
within the mapping unit. This till
sediment was deposited directly by and underneath the glacier; and was not subsequently
re-worked by glaciofluvial meltwater. The random melting of ice and
deposition of material produced rolling and hummocky topography that is
characteristic of ground moraine.
This mapping unit also corresponds to and covers a larger moraine feature
called the Alexandria moraine. Hummocky
moraine sediments are located in the central part of the county.
|
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|
Interlobate Complex
Sediments (Qit) |
Unsorted
and unstratified clay, silt, sand, gravel, cobbles and boulders intricately
mixed with sorted silt, sands, and gravels.
This till/outwash complex was deposited between two glacial lobes
originating from the northeast (Des Moines Lobe). Sediment deposition is associated with both glacial and
glaciofluvial processes that create a complex of till and outwash. This sediment is located in the
northwestern portion of the county. |
|
|
|
|
Till (Des Moines Lobe)
over Ice Contact Sediments (Superior Lobe) (Qst) |
Unsorted
and unstratified clay, silt, sand, gravel, cobbles and boulders (associated
with the Des Moines Lobe) over stratified medium to coarse sand, gravel with
occasional layers of silt, cobbles, and small boulders (associated with the
Superior Lobe). The sands and gravels
are interpreted to be outwash deposited in between and within stagnant
ice. Till from the Des Moines Lobe
caps the outwash with varying thickness (2 to 20+ feet). This mapping unit is associated to
stagnant ice moraine and is located along the northeastern and eastern
boundary of the county.
|
|
Sgeo_lab |
|
Text, 4 |
Qlu, Qdl, Qdt, Qoc, Qot,
Qmt, Qic, Qtg, Qcm, Qts, Qsm, Qht, Qit, Qst |
The label for the
geomorphology-sediment association used on map Plate B. |
|
Sgeo_age |
|
Text,30 |
Holocene,
Holocene/Wisconsin, and Wisconsin |
Describes the age of the
material encountered at the surface: Holocene: 0-8,000 years Wisconsin: >8,000 to
20,000+ |
|
Sgeo_process |
|
Text, 40 |
|
The type of geological
process that deposited these features. |
|
|
|
|
Alluvial |
Modern stream processes |
|
|
|
|
Alluvial over
Glaciofluvial |
Modern stream processes
overlying glaciofluvial (glacial stream) processes |
|
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|
Deltaic/Lacustrine |
Sorted sediment
deposited in a basin of water. |
|
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Glacial |
Unsorted glacial material
deposited in place. |
|
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|
|
Glacial/Glaciofluvial |
Unsorted glacial
material deposited and glacial sediments. |
|
|
|
|
Glaciofluvial |
Glacial sediments that
have been sorted by meltwater. |
|
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Glaciofluvial over Glaciolacustrine |
Glacial sediments that
have been sorted by meltwater over sediments deposited at the bottom of a
glacial lake. |
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Lacustrine |
Sediments deposited at
the bottom of a glacial lake. |
|
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|
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Lacustrine over
Glaciofluvial |
Sediments deposited at
the bottom of a glacial lake over glacial sediments that have been sorted by
meltwater. |
|
Sgeo_feat |
|
Text, 50 |
Alluvial fan, Alluvial
Valley, Alluvium in Outwash Valley, Collapsed Feature, Collapsed Outwash
Channel, End Morain, Esker, Fan/Delta, Glacial Lake, Ground Moraine, Hummocky
Moraine, Ice Walled Lake, Kame, Lake in Outwash Channel, Medial Moraine,
Modified Ground Moraine, Outwash Channel, Outwash Feature, Outwash Terrace,
Outwash Valley, Stagnant Ice Moraine, Thrust Feature, Tunnel Valley. |
The type of geological
feature encountered at the surface (surficial geology). Surficial
Geology is defined as the geologic units encountered within the top 5 to 10
feet of the surface. |
|
Sgeo_mat |
|
Text, 40 |
e.g., Clay, silt, and
sand over till; Sand; Sand and gravel; Granite; Till with patchy sand and
gravel. |
The dominant type of
material encountered in the surficial geologic unit. |
|
SG_sigpot |
|
Text,50 |
|
The aggregate resource
potential for sand and gravel, as shown on map Plate A. From the legend
on Plate A…. POTENTIAL SAND AND GRAVEL
RESOURCES: Geologic units that are inferred to contain sand and
gravel. These units exhibit the geologic characteristics that typically
produce sand and gravel deposits. Existing gravel pit and MN/DOT
aggregate sources lying within these units indicate identified or known
resources. The geologic units having potential for sand and gravel
include alluvial features (flood plains, terraces, and fans), glacial outwash
features (channels and terraces), and ice-contact features (eskers and
kames). These units typically contain sorted sand and gravel with
little silt or clay. |
|
SG_PotA_SG |
|
Text, 50 |
Potential Sand and
Gravel Resources; Potential Crushed Stone Resource; Limited Potential for
Aggregate Resources. |
Significant Aggregate
Resources Deposits are defined as those deposits most likely to be explored
and evaluated for future commercial use. They include all the moderately
and highly desirable sand, gravel, and crushed stone deposits as well as very
large areas of finer sand and gravel that could be blended with coarser
material to make more highly desirable deposits. |
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|
Highly Desirable Sand
and Gravel Deposits |
Glaciofluvial features,
such as terraces and outwash channels. These deposits are very large in
aerial extent. These deposits consist of sand and gravel with thickness
typically ranging from 15 to 75+ feet with less than 5 feet of
overburden. The probability that a potential sand and gravel deposit
exists within this unit is high to very high. The textural
characteristics of these deposits are classified as good to very good.
The quality is typically moderately high to very high relative to all deposits
within Meeker County. |
|
|
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|
Moderately Desirable
Sand and Gravel Deposits |
Glaciofluvial features,
such as outwash channels and terraces; ice-contact features, such as eskers
and kames; as well as Holocene age terraces, floodplains, and fans.
These deposits are moderately small to large in aerial extent with sand and
gravel thickness typically ranging from 10 to 50+ feet, with less than 10
feet of overburden. The probability that a potential sand and gravel
deposit exists within this unit is moderately to very high. The
textural characteristics of these deposits are moderate to very good, with
the quality ranging from moderately high to high. |
|
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|
Less Desirable Sand and
Gravel Deposits |
Glaciofluvial features,
such as outwash channels and terraces; ice-contact features, such as eskers
and kames; and alluvial |
|
|
|
|
Limited Potential Sand
and Gravel Deposits or Limited Potential for
Aggregate Deposits |
Units that include
glacial features such as collapsed glaciofluvial channels, ground moraines,
end moraines, colluvial slopes, and small alluvial features such as flood
plains and streams. The probability that a significant aggregate
deposit exists within this unit is very low to moderate. The aggregate
deposits occurring in this unit are very small to moderately small in aerial
extent and typically consist of finer material (sand with some gravel).
The thickness of these aggregate deposits are typically less than 10 feet,
with overburden thickness |
|
SG_Prob |
|
Text, 20 |
Very High, High,
Moderately High, Moderate, Moderately Low, Low. |
The relative degree of
certainty that sand and gravel exists within a unit. Based on air photo
interpretations, field observations, CWI, drilling, presence of gravel pits
and quarries, etc. Each unit is relative to the other units and range
from very high to very low. |
|
Sg_Depsize |
|
Text, 20 |
Very large, Large,
Moderately large, Moderate, Moderately small, Small |
The relative size of
the sand and gravel deposit |
|
Size_in_ac |
|
Text, 7 |
>50, 40-50, 30-40,
20-30, 10-20, 5-10 |
The size of the deposit
in acres. |
|
SG_thickmn |
|
Integer, 6 |
0, 5, 10, 15, 20, 25,
30 |
Describes the minimum
thickness of the sand and gravel unit. |
|
SG_thickmax |
|
Integer, 6 |
5, 10, 15, 20, 25, 30,
40, 50, 75 |
Describes the maximum
thickness of the sand and gravel unit. |
|
SG_thickmd |
|
Text, 1 |
+ |
The sg_thickness
modifier indicates that the thickness of the unit exceeds the value listed in
the Sg_thickmx field. |
|
SG_overmin |
|
Integer,6 |
0, 3, 10, 20 |
Describes the minimum
thickness of the overburden covering the sand and gravel. |
|
SG_overmax |
|
Integer,6 |
1, 3, 5, 10, 15, 20,
30, 40, 50 |
Describes the maximum thickness
of the overburden covering the sand and gravel. |
|
SG_overmod |
|
Text,1 |
+ |
The sg_overburden
modifier indicates that the thickness of the overburden exceeds the values
listed in the Sg_overmax field. |
|
SG_Texture |
|
Text, 20 |
Very Good, Good,
Moderately Good, Moderate/Good, Moderate, Moderately Poor, Poor/Good, Poor. |
A relative scale of the
textural quality of the sand and gravel resource (sieve analysis). The
coarser the material the higher the rating. Fine sand material would
have a poorer rating. See MN/DOT Pit sheets for more detail. |
|
SG_Quality |
|
Text, 20 |
Very High, High,
Moderately High, Moderate/High, Moderate, Moderately Low, Low/High, Low |
A relative scale of the
quality of the sand and gravel (soundness, durability, and mineral
makeup). Determined from MN/DOT pit sheets. |
|
SG_thick |
|
Text, 15 |
5-15,
10-30, 20-100+ |
Gives range of minimum
and maximum thickness for sand and gravel deposit |
|
SG_overbdn |
|
Text, 15 |
0-100+,
0-5, 10-50 |
Gives range of minimum
and maximum thickness for overburden |
|
BuriedDep |
|
Text, 5 |
Yes
or No |
Roughly outlines
deposit of sand and gravel that is buried by significant overburden (40-60
ft.) |