S:\nrimc\r\readfield\arcmap\shapefiles\readfield_bedrock_data_points.html

Metadata:

• Spatial_Data_Organization_Information
• Entity_and_Attribute_Information

Spatial_Data_Organization_Information:

Point_and_Vector_Object_Information:

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: readfield_bedrock_data_points

Entity_Type_Definition: Point feature class

Entity_Type_Definition_Source: ESRI

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: Esri

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: state_id

Attribute_Definition:

Unique state-wide point identification number for bedrock data location.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: Unique assigned number

Attribute:

Attribute_Label: quadname

Attribute_Definition: Name of 7.5-minute USGS quadrangle.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: Quadname

Attribute:

Attribute_Label: type_code

Attribute_Definition:

A 1-character or 2-character code that indicates what type of geologic feature is being reported in that row. This code is necessary for displaying symbols on the geologic map, each type of feature being represented by a particular symbol.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: see associated attribute table

Attribute:

Attribute_Label: type_expl

Attribute_Definition: Explanation of type codes used in the quadrangle.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: see associated attribute table

Attribute:

Attribute_Label: azimuth

Attribute_Definition:

Strike or Trend. If the Feature type code refers to a planar feature (such as bedding) or a linear feature (such as a fold axis), the orientation of that feature must be specified, using the two fields labeled azimuth and angle. The Strike or Trend is an azimuth in degrees, that must be a number between 0 and 360 (inclusive). Strikes (of planar features) is reported according to the “right-hand-rule” convention, in which the strike is 90 degrees less than the dip direction. This means that strikes between 0 and 90 dip to the southeast; strikes between 90 and 180 dip to the southwest; strikes between 180 and 270 dip to the northwest; and strikes between 270 and 360 dip to the northeast. For horizontal planes, a default strike of zero is used (though technically the strike is undefined); for vertical planes, either end of the strike line may be used. Trends (of linear features) are always reported in the down-plunge direction. For vertical lines (plunge = 90), a default trend of zero is used (though technically the trend is undefined); for horizontal lines, either end of the trend line may be used. If the Strike or Trend is not known, a value of -1 (negative one) is used.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: geologist field data

Attribute:

Attribute_Label: angle

Attribute_Definition:

Dip or Plunge. If the Feature type code refers to a planar feature (such as bedding) or a linear feature (such as a fold axis), the orientation of that feature is specified, using the two columns labeled azimuth and angle. The Dip or Plunge is an angle measured in degrees, that must be between 0 (horizontal) and 90 (vertical) (inclusive). Dips (of planar features) and plunges (of linear features) are always measured downward from horizontal, in a vertical plane. If the Dip or Plunge is not known, a value of -1 (negative one) is used.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: geologist field data

Attribute:

Attribute_Label: modifier

Attribute_Definition:

The modifier is intended to distinguish between features that are basically all of the same type, but which differ by some secondary characteristic. For example, several localities in the quadrangle may have upright bedding, which would be assigned the same type code and have the same map symbol. But a modifier may be used in order to distinguish between sites with graded beds and sites with cross-beds, by assigning a modifier (such as “gr” for graded beds or “x” for cross-beds) that would be plotted next to the bedding symbol on the map.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: see definition in mod_expl field in associated attribute table

Attribute:

Attribute_Label: mod_expl

Attribute_Definition: Explanation of modifiers used in the quadrangle.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: see associated attribute table

Attribute:

Attribute_Label: descript

Attribute_Definition:

The Feature description is a text field that allows the geologist to make comments about the specific feature indicated by the Feature type code at this particular site. For example, if the Feature type code indicates a mafic dike, the Feature description could report the thickness of the measured dike, the presence of chilled margins, phenocryst abundance and size, etc.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: see associated attribute table

Attribute:

Attribute_Label: data_src

Attribute_Definition:

Formal citation of the data source. In most cases, the source of the data will be original field work by the geologist submitting the file. Example 1: Henry N. Berry IV, Maine Geological Survey, 2007-2008, original data. In some cases, however, data may have been compiled from existing sources such as published maps, unpublished thesis maps, well logs, etc. This is allowable as long as the data source is properly acknowledged. Example 2: Arthur M. Hussey II, 1971, Geologic Map of the Portland Quadrangle, Maine. Maine Geological Survey map GM-1, 1:62,500. Listing the source of data separately from the “person submitting this file”, allows someone to submit data collected by someone else, but the person submitting the file is responsible for any errors that may occur. Citing the original source allows questions to be investigated and errors to be corrected. Each data file must contain data from only one source. If data are being submitted from more than one source, they must be submitted in separate data files.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: from associated open-file map

Attribute:

Attribute_Label: submit_by

Attribute_Definition:

Name of the person who actually delivered the file to MGS. (This might not be the person who collected the data, or the person who created the file.) This is the one person responsible for the data file.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: from associated open-file map

Attribute:

Attribute_Label: submit_dat

Attribute_Definition:

Date when the file was actually delivered to MGS. (This is not the date when the data were collected, and probably not the date the data file was created.)

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: from associated open-file map

Attribute:

Attribute_Label: method

Attribute_Definition:

This field describes how the data were collected. If they are original data, then they were collected by field work. If they are pre-existing data, then they may have been transcribed from existing maps or copied from data tables or log sheets. This may be a lengthy comment, if it was a complex procedure. Example 1: Field work. Example 2: Data recovered by digitizing symbols from existing paper map. Example 3: Data transcribed from Table 12, p. 134-138 of thesis.

Attribute_Definition_Source: MGS

Attribute_Domain_Values:

Unrepresentable_Domain: from geologist field data

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Overview_Description:

Entity_and_Attribute_Overview: Attribute table for bedrock geology data points.