Table Name |
Field Name |
Begin Column |
Definition |
Valid Values |
Descriptions |
Sheragppy.dbf |
Map_unit |
|
Integer,3 |
102, 103, 104, 105,
106. |
Unique identifier for
the mapping units. The units are
described under Mu_desc. |
|
Mu_desc |
|
Text, 100 |
Significant aggregate
deposits, mainly gravel (Map_unit=102) |
Aggregate resources
whose location, grade, and quality are known from specific geological
evidence. Areas containing
significant aggregate deposits consisting mainly of gravel. |
|
|
|
|
Significant aggregate
deposits, mainly sand and gravel (Map_unit=103) |
Aggregate resources
whose location, grade, and quality are known from specific geological
evidence. Areas containing
significant aggregate deposits consisting mainly of sand and gravel, such as
those within the otherwise broad sandy outwash along the Mississippi River. |
|
|
|
|
Potential resources,
require further evaluation (Map_unit=104) |
Potentially significant
aggregate resources, whose location, grade, and quality are indicated by
general geological evidence, but which require further evaluation. |
|
|
|
|
Subeconomic Resources,
no significant deposits, undevelopable, uneconomic (Map_unit=105) |
Those containing no
significant aggregate deposits due to poor grade or small size. |
|
|
|
|
Bedrock Outcrops
(Map_unit=106) |
|
|
Pot_plateA |
|
Text,15 |
Bedrock |
Areas containing
bedrock outcrops at or near the surface. |
|
|
|
|
Limited |
Limited potential for
aggregate resources: those geological
units that generally have little or no potential for aggregate resources. |
|
|
|
|
Potential |
Potential aggregate
resources: those geological units
that are inferred to contain potentially significant aggregate deposits. |
|
Add_2001 |
|
Integer,3 |
0 |
Areas in the rest of
the county that probably do not have or have limited bedrock outcrops. |
|
|
|
|
107 |
Areas containing bedrock
outcrops at or near the surface. |
Table Name |
Field Name |
Begin Column |
Definition |
Valid Values |
Descriptions |
Sheragpln.dbf |
Map_unit |
|
Number,3,0 |
201 |
County Boundary |
|
|
|
|
251 |
Geologic contact |
|
|
|
|
252 |
Inferred geologic
contact |
|
|
|
|
253 |
Approximated geologic
contact |
|
Mu_desc |
|
Text, 50 |
County Boundary |
|
|
|
|
|
Geologic contact |
The boundary between
geological units. |
|
|
|
|
Inferred geologic
contact |
The boundary between
geological units that is less well defined. |
|
|
|
|
Approximated geologic
contact |
The boundary of the
bedrock outcrop based on the 1995 map by Jirsa and Chandler and air photo
interpretation. |