Table Name |
Field Name |
Begin Column |
Definition |
Valid Values |
Descriptions |
Renvagppy.dbf |
Id |
|
Integer,8 |
Values from 208 to 660. |
Unique identifier for the field mapping units |
|
Fieldudesc |
|
Text, 70 |
e.g., Colluvium
- Slope Wash/Debris; Glaciofluvial Outwash Terrace - 50+ ft Sand w/
Gravel (Low); Holocene Alluvium - Sand (>5 feet); Ice Contact - Sand
and Gravel - Low Potential; Granite/Gneiss, Till - Slope of
Valley Wall. |
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 map
Plate B. Mapping units may be bedrock
material, a glacial sediment, or a modern Holocene sediment. |
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Colluvial Sediments (Qcl) |
Clay, silt,
sand, and gravel, with occasional cobbles and boulders of varying
composition, as well as angular fragments of limestone and sandstone of
varying sizes. The sediment is moderately-
to poorly-sorted, however, it occasionally contains thin (<6 inch)
beds of well-sorted alluvial material. Colluvium
is deposited at the foot of steep slopes where the bank material has
collapsed and become slightly washed by sheetwash and alluvial
processes. This colluvial sediment is
primarily located at the base of the steep till and bedrock walls
paralleling the Minnesota River. |
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Alluvial Flood Plain Sediments (Qfp) |
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, in low lying areas
where drainage occurs as channelized flow, and within the current flood
plain of the Minnesota River. |
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Alluvial Fan Sediments (Qaf) |
Stratified fine sand, coarse sand, and
gravel, with thin layers of silt and clay. The
sediment is moderately well- to very well-sorted. Coarser
material is typically found at the base of the fan (that is, the bottom
of the deposit) and near the mouth of the fan. The
sediment is generally deposited at the end of tributary streams where
they enter larger valleys, due to the change in slope and slowing of
the water flow, forming a cone shaped deposit. Alluvial
fan sediments primarily occur in the western part of the county where
smaller tributary streams enter the Minnesota River valley. |
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Alluvial Terrace Sediments (Qat) |
Fine sand, coarse sand, and gravel, with
occasional layers of silt and clay. The
sediment is moderately well- to well-sorted with thin layers, lenses,
and pockets of very well-sorted sands and gravels.
The terraces are typically covered by 6 inches to 2 feet
of silt, clay, and/or fine sand layers derived from flood plain
sediments. Alluvial terrace sediments are
found along tributary streams that enter the Minnesota River, where
moving water has cut through the pre-existing till and glaciofluvial
material and redeposited the sorted sands and gravels. |
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Glaciofluvial Outwash Terrace Sediments (Qot) |
Stratified coarse to fine sand, and gravel
with occasional layers |
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Glaciofluvial Outwash Channel Sediments (Qoc) |
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 |
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Lacustrine Sediments (Qlu) |
Massive silt, clay, or fine sand with
interbeds of sandy silt and fine sand. The sediment is associated
with the ponding of glacial meltwater to form a shallow, short-lived
lake (Glacial Lake Benson). The margin of the lake is not
well defined and discontinuous, which is interpreted to be due to |
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Glacioacustrine Sediments over Till (Qlt) |
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
during the initial phases of Glacial Lake |
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Stream 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. |
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Ice Contact Sediment 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. Ice contact sediments can be observed in
long narrow, occasionally sinuous, ridges that are broadly interpreted
to be eskers. Eskers form as water transported sediment at the
base of glacial ice or within melting blocks of ice. Other
landforms |
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Stagnant Ice Sediments Sediments (Qtm) |
Stratified silt, fine sand, coarse sand and
gravel with frequent clay and washed till mixed throughout. This
sediment is found in discontinuous patches and ridges; the sediment is
poorly- to well-sorted, well-stratified to mixed, and is
variable. The ridges are interpreted to have formed when glacial
meltwater |
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Till - Collapsed Sediment (Qcc) |
Till sediment (unsorted clay, silt, sand,
gravel, cobbles, and boulders) overlain with occasional, discontinuous
and patchy accumulations of sand, silt, clay and organics. These
sediments are observed in mostly elongated, segmented depressions and
occasionally in singular amorphous depressions. |
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Till - Ground Moraine Sediments (Qtg) |
Unsorted and unstratified clay, silt, sand,
gravel, cobbles with occasional boulders. This till sediment
(also called unsorted drift) was deposited directly by and underneath
the glacier without subsequent reworking by glacial meltwater.
The random melting of ice and deposition of material produced a
relatively flat to gently rolling, hummocky topography that is
characteristic of ground moraine. |
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Till - Ground Moraine Sediments (Grantsburg)
(Qgg) |
Unsorted and unstratified clay, silt, sand,
gravel, cobbles with occasional boulders. This till unit contains
parallel, semi-regularly spaced till ridges deposited in a "washboard"
pattern. These ridges are too small to delineate at the map
scale and are shown with line symbols. The ridges within |
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Till - End Moraine Sediments (Qte) |
Till sediment (unsorted clay, silt, sand,
gravel, cobbles, and boulders) that has been deposited into multiple
broad, arcuate, landforms. End moraines form at the terminus of
active glacial ice and |
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Till – Cosmos End Moraine Complex (Qcm) |
Till sediment (unsorted clay, silt, sand,
gravel, cobbles and boulders) |
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Clay/Kaolin Clay (Kc) |
White, light gray, yellowish-brown, and dark
green colored, thinly laminated clays. The clay |
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Pisolitic Regolith (Kp) |
Red, dark brown, tan to light green in color
regolith with pisolite nodules. A resistant, iron-rich |
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Granite/Gneiss, undivided (Pg) |
Dominant llithologies are pink and/or gray,
black colored, foliated and banded |
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Sgeo_lab |
|
Text, 4 |
Qcl, Qfp, Qaf, Qfp, Qot, Qoc, Qlu, Qlt, Qmt,
Qic, Qtm, Qcc, Qtg, Qgg, Qte, Qcm, Kc, Kp, Pg |
The label for the surficial geology mapping
unit used on map Plate B. |
|
Sgeo_age |
|
Text,30 |
Precambrian, Cretaceous, Holocene,
Holocene/Cretaceous, Holocene/Pleistocene, Holocene/Precambrian,
Pleistocene, |
Describes the age of the material encountered
at the surface. |
|
Sgeo_proc |
|
Text, 40 |
|
The type of geological process that deposited
these features. |
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Alluvial |
Modern stream processes |
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Alluvial over Glaciofluvial |
Modern stream processes overlying
glaciofluvial (glacial stream) processes |
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Bedrock |
Material deposited by ancient seas during the
Cambrian and Ordovician. |
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Colluvial |
Material that was deposited as slope wash or
slump along steep banks. |
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Glacial |
Unsorted glacial material deposited in place. |
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Glacial over Glaciofluvial |
Unsorted glacial material deposited over
glacial sediments that have been sorted by meltwater. |
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Glaciofluvial |
Glacial sediments that have been sorted by
meltwater. |
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Glaciolacustrine |
Sediments deposited at the bottom of a
glacial lake. |
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Sgeo_feat |
|
Text, 50 |
Alluvial fan, Alluvial terrace, Bedrock,
Collapsed channel, Colluvial slope, Flood plain, Glacial lake bed,
Ground moraine, Ice contact, Outwash channel, Outwash terrace, Sand
bar, Stagnant ice moraine. |
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 |
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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Sg_potpla |
|
Text,100 |
e.g., Highly Desirable Sand and Gravel
Deposits; Less Desirable Sand and Gravel Deposits/Moderately Desirable
Crushed Stone Deposits; Limited Potential Aggregate Resources. |
The aggregate resource potential, combined
from the Sg_pota_sg and Sg_pota_cs fields. |
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Sg_pota_sg |
|
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. |
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Highly Desirable Sand and Gravel Deposits |
Glaciofluvial features, such as terraces and
outwash channels. These deposits are very large in areal extent¹. These
deposits consist of sand and gravel with thicknesses typically ranging
from 15 to 40+ feet with less than 5 feet |
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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 areal
extent with sand and gravel thicknesses typically ranging from 10 to
20+ 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 |
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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
areal extent and typically consist of finer material (sand with some
gravel). The thicknesses of these aggregate deposits are
typically less than 10 feet, with overburden thicknesses |
|
Sg_pota_cs |
|
Text,50 |
|
The aggregate resource potential for crushed
stone, as shown on map Plate A. From the
legend on Plate A… POTENTIAL
CRUSHED STONE RESOURCES: Granite and other
crystalline bedrock formations, (gneiss, monzonite, gabbro,
amphibolite, basalt, and peridotite) that are suitable for
crushing. These units are inferred to be relatively thick (10 to
100+ feet), with overburden thicknesses ranging from 0 to 25+
feet. Quarries |
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Highly Desirable Crushed Stone Deposits |
Granite and other crystalline bedrock
formations that contain material suitable for crushed aggregate.
These units are exposed |
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Moderately Desirable Crushed Stone Deposits |
Granite and other |
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Less Desirable Crushed Stone Deposits |
Granite and other crystalline bedrock |
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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. |
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Sg_depsize |
|
Text, 20 |
Very large, Large, Moderately large,
Moderate, Moderately small, Small |
The relative size of the sand and gravel
deposit |
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Size_in_ac |
|
Text, 7 |
>50, 40-50, 30-40, 20-30, 10-20, 5-10 |
The size of the deposit in acres. |
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Sg_thickmn |
|
Integer, 4 |
0, 5, 10, 15, 20, 25, 30 |
Describes the minimum thickness of the sand
and gravel unit. |
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Sg_thickmx |
|
Integer, 4 |
5, 10, 15, 20, 25, 30, 40, 50, 75 |
Describes the maximum thickness of the sand
and gravel unit. |
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Sg_thickmd |
|
Text,1 |
+ |
The sg_thickness modifier indicates that the
thickness of the unit exceeds the value listed in the Sg_thickmx field. |
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Sg_overmin |
|
Integer,4 |
0, 3, 10, 20 |
Describes the minimum thickness of the
overburden covering the sand and gravel. |
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Sg_overmax |
|
Integer,4 |
1, 3, 5, 10, 15, 20, 30, 40, 50 |
Describes the maximum thickness of the
overburden covering the sand and gravel. |
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Sg_overmod |
|
Text,1 |
+ |
The sg_overburden modifier indicates that the
thickness of the overburden exceeds the values listed in the Sg_overmax
field. |
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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. |
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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. |
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Sg_thick |
|
Text, 15 |
e.g., 0-5, 5-30+, 20-40, 25-75+ |
The assumed range of thickness of the sand
and gravel deposit (in feet). A
combination of the Sg_thickmn, Sg_thickmx, and Sg_thickmd fields. |
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Sg_overbdn |
|
Text, 15 |
e.g., 0-1,
0-20+, 10-20, 20-40+ |
The assumed range of overburden thickness of
a sand and gravel deposit (in feet). A
combination of the Sg_overmin, Sg_overmax, and Sg_overmod fields. |