Table Name |
Field Name |
Begin Column |
Definition |
Valid Values |
Descriptions |
carlcsp.dbf |
OBJECTID |
|
Number,4,0 |
Ex: 1,2,9 |
Unique Number for each
crushed stone potential polygon |
|
POTENTIAL |
|
Text, 75 |
See Below |
|
Significant Potential for
Crushed Stone Resources |
Basalt
and metavolcanic formations (e.g., metagabbro) suitable for crushing. These units are
inferred to be relatively thick (greater than 100 feet), with overburden
thicknesses ranging from 0 to 20 feet. No quality tests have been conducted
on these rock types within Carlton County. |
||||
Nonsignificant Potential for Crushed Stone Resources |
Bedrock geology units of
sedimentary rocks, metamorphosed sedimentary rocks,
and volcanic rocks that are not suitable for crushing with varying degrees of
overburden. Or basalt and metavolcanic formations (e.g., metagabbro)
that are suitable for crushing however
have overburden greater than 10 feet for metavolcanics
or 50 feet for basalt. |
||||
|
CLASS |
|
Text, 75 |
See Below |
|
Moderate Potential for
Crushed Stone Resources |
Basalt
exposed or buried beneath 0 to 20 feet of overburden and metavolcanic
formations exposed or buried beneath 0 to 10 feet of overburden. Based on generalized rock quality
assessments, these units have a moderate to moderately high probability of
providing material suitable for crushed stone aggregates. |
||||
Low Potential for Crushed
Stone Resources |
Basalt
buried beneath 50 feet of overburden and metavolcanics
buried beneath 10 to 20 feet of overburden.
Based on generalized rock quality assessments, these units have a
moderate probability of providing material suitable for crushed stone
aggregates. |
||||
Limited Potential for
Crushed Stone Resources |
Sandstone,
metasediments and metavolcanics
exposed or buried under overburden.
Based on the rock types shown on existing bedrock geologic maps, these
units have a low probability of providing material suitable for crushed stone
aggregates. |
||||
|
OVERBURDEN |
|
Text, 15 |
See Below |
|
0 - 10 |
0 – 10 feet of overburden |
||||
0 - 20 |
0 – 20 feet of overburden |
||||
10 - 20 |
10 - 20 feet of
overburden |
||||
0-50 |
50 feet of overburden |
||||
|
QUALITY |
|
Text, 20 |
Moderately High,
Moderate, Poor |
The relative degree of
quality that a bedrock unit can be used for crushed stone. |
|
PROBABLTY |
|
Text, 20 |
Moderately High,
Moderate, Low |
The relative degree of
certainty that crushed stone exists within a unit. Based on air photo interpretations, field
observations, CWI, drilling, etc. Each
unit is relative to the other units and range from moderately high to low. |
|
BDRK_UNIT |
|
Text, 50 |
See Below |
Describes the Bedrock
Units most associated with the mapping units. |
|
|
Chengwatana Basalt |
Includes rocks that have
similar chemical and physical properties as basalt. Known quarry in Pine County within this
formation. Generally suitable for
crushed stone. |
||
|
|
Metavolcanic |
Includes rocks that have
similar chemical and physical properties as metagabbro
as well as metamorphosed basalt, known as metabasalt. Can be suitable for crushed stone depending
on degree of metamorphism. |
||
|
|
Metasediments, Metavolcanics, Sandstone |
Includes rocks that have
similar chemical and physical properties as metavolcanics,
metasediments (e.g., schist, slate, phyllite), and sandstone.
Although these units can be suitable for crushed stone, within Carlton
County and Fond du Lac Reservation these units have poor quality based on
their degree of metamorphism and competency. |
||
Sandstone |
A sedimentary rock that
is generally not suitable for crushed stone potential. |