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.