Latest Cretaceous and Cenozoic magmatic rocks of Alaska: polygon data

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1997
Title:
Latest Cretaceous and Cenozoic magmatic rocks of Alaska: polygon data
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Anchorage, AK
Publisher: U.S. Geological Survey
Online_Linkage: http://agdc.usgs.gov/data/usgs/geology/
Larger_Work_Citation:
Citation_Information:
Originator: Moll-Stalcup, E.J. (compiler)
Originator: Brew, D.A. (compiler)
Originator: Vallier, T.L. (compiler)
Publication_Date: 1994
Title: Latest Cretaceous and Cenozoic magmatic rocks of Alaska
Series_Information:
Series_Name: Decade of North American Geology
Issue_Identification: G-1
Publication_Information:
Publication_Place: Boulder, CO
Publisher: Geological Society of America
Other_Citation_Details:
Volume G-1 is titled "The Geology of Alaska"; this map is plate 5 of the volume.
Description:
Abstract:
This map is a statewide summary of magmatic (igneous) rocks grouped into geologic units that can be portrayed cartographically at 1:2,500,000.

This dataset consists of a polygon coverage and associated attribute data derived from the 1994 map "Latest Cretaceous and Cenozoic magmatic rocks of Alaska" compiled by E.J. Moll-Stalcup, D.A. Brew, and T.L. Vallier. This map was originally published ( at 1:2,5000,0000) as Plate 5 in Volume G-1, "The Geology of Alaska", edited by G. Plafker and H.C. Berg, and published by the Geological Society of America (GSA). Volume G-1 (The Geology of Alaska) is one of a series published by GSA for the Decade of North American Geology (DNAG), and is often referred to as the DNAG-Alaska volume.

This digital dataset includes all 44 magmatic rock units from the original map, including dredged and outcrop sampled areas. It includes attributes for rock age (6 groups), composition (8 groupings), ranges and combinations of age and composition; and the location of hypabyssal or agglomeratic/tuffaceous units (TYPE = H or T)

This coverage is not intended to be a complete representation of the printed map. It does NOT include the following features: locations of calderas or volcanoes; inset maps of magmatic provinces; or explanatory text (introduction and references).
Purpose:
This coverage is intended to provide digital features (polygons) representing generalized magmatic rock units in Alaska for use in small-scale spatial analysis (statewide) with similar coverages such as other geologic units, vegetation types, soils, etc.
Supplemental_Information:
Procedures_Used: The linework was digitized in 1997 from a paper copy of the 1994 map at the U.S. Geological Survey's Alaska Section (Geologic Division) facilities in Anchorage, AK. The original Transverse Mercator projection of the map (Central Meridian: 100*W; Scale factor: 0.926; Reference ellipsoid:(6371204m, 63712004m)) was converted to an Albers equal-area coverage in ARC/INFO (version 7.1.2). The resulting coverage did not align exactly with an Albers equal-area coverage of the Alaskan coastline, so a rubber-sheeting operation was performed using points along the coastline and major rivers to match an Albers equal area projection. Map unit (polygon) locations and attributes were checked by the person responsible for the digitizing, and spot-checked by one reviewer, by comparing a printed copy of the coverage to the published map. Metadata were collected using document.aml v. 7.1.1, distributed by ESRI, Inc.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1997
Currentness_Reference: Year in which the coverage was produced from the published map
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 167.0
East_Bounding_Coordinate: -130.0
North_Bounding_Coordinate: 72.0
South_Bounding_Coordinate: 51.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Geology
Theme_Keyword: Igneous
Theme_Keyword: Magmatic
Theme_Keyword: Intrusive
Theme_Keyword: Volcanic
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Alaska
Access_Constraints: none
Use_Constraints:
This coverage should not be copied or distributed without its associated metadata file. Intended use is at small scales (e.g. statewide, 1:2,500,000 etc.) only; enlargements of this data to scales greater than that at which they were originally compiled can lead to misinterpretation of data. The U.S. Geological Survey (Dept. of Interior) should be acknowledged as the data source in products derived from these data. Use of these data is not restricted; however, organizations, agencies, units of government or other users are responsible for its appropriate application.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey Alaska Section, Mineral Resource Surveys Program, Geologic Division
Contact_Position: GIS Support Staff
Contact_Address:
Address_Type: mailing and physical address
Address: 4200 University Dr.
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4667
Contact_Voice_Telephone: (907)-786-7495
Data_Set_Credit: D. C. Pray, J. M. Schmidt
Native_Data_Set_Environment: SunOS, 5.5.1, sun4u UNIX, ARC/INFO version 7.1.2
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The quality of the geologic data in the digital coverage is that of the published 1994 map, which summarized data collected prior to that date (mainly since 1980). No recent data have been added. The geographic accuracy of the published map has been slightly degraded by the rubber-sheet operation.
Completeness_Report:
The following map features are not included in the digital representation: calderas, volcanoes, inset maps, introduction, references, and Table 1.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Moll-Stalcup, E.J. (compiler)
Originator: Brew, D.A. (compiler)
Originator: Vallier, T.L. (compiler)
Publication_Date: 1994
Title: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska
Series_Information:
Series_Name: Decade of North American Geology
Issue_Identification: G-1
Publication_Information:
Publication_Place: Boulder, CO
Publisher: Geological Society of America
Source_Scale_Denominator: 2500000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Moll-Stalcup and others (1994)
Source_Contribution: Geologic units and attributes
Process_Step:
Process_Description:
The linework was digitized in 1997 from a paper copy of the 1994 map at the U.S. Geological Survey's Alaska Section (Geologic Division) facilities in Anchorage, AK. The original Transverse Mercator projection of the map (Central Meridian: 100*W; Scale factor: 0.926; Reference ellipsoid:(6371204m, 63712004m)) was converted to an Albers equal-area coverage in ARC/INFO (version 7.1.2). The resulting coverage did not align exactly with an Albers equal-area coverage of the Alaskan coastline, so a rubber-sheeting operation was performed using points along the coastline and major rivers to match an Albers equal area projection. Map unit (polygon) locations and attributes were checked by the person responsible for the digitizing, and spot-checked by one reviewer, by comparing a printed copy of the coverage to the published map. Metadata were collected using document.aml v. 7.1.1, distributed by ESRI, Inc.
Process_Date: 1997
Process_Step:
Process_Description:
Edited metadata, fixing problems due to DOCUMENT.aml and clarifying information where possible.
Process_Date: 20060522
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 1285
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 2156
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 1287

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel: 55.0
Standard_Parallel: 65.0
Longitude_of_Central_Meridian: -154.0
Latitude_of_Projection_Origin: 50.0
False_Easting: 0.00000
False_Northing: 0.00000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: Unknown
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: MAGMATIC.PAT
Entity_Type_Definition: Plutonic rock units
Attribute:
Attribute_Label: A
Attribute_Definition: Location of feldspathoid basalt units
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not feldspathoid basalt
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is feldspathoid basalt
Attribute:
Attribute_Label: B
Attribute_Definition: Location of basalt units
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not basalt
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is basalt
Attribute:
Attribute_Label: C
Attribute_Definition: Location of Andesite units
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not andesite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is andesite
Attribute:
Attribute_Label: D
Attribute_Definition: Location of Dacite units
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not dacite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is dacite
Attribute:
Attribute_Label: E
Attribute_Definition: Location of rhyolite and dacite units
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not rhyolite or dacite
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is rhyolite or dacite
Attribute:
Attribute_Label: F
Attribute_Definition: Location of granitic (intermediate to felsic) units
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not intermediate to felsic granitic rock
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is intermediate to felsic granitic rock
Attribute:
Attribute_Label: G
Attribute_Definition: Location of Granitic (dominantly felsic) units
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not dominantly felsic rock
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is dominantly felsic rock
Attribute:
Attribute_Label: H
Attribute_Definition: Location of gabbro units
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not gabbro
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is gabbro
Attribute:
Attribute_Label: AGE-1
Attribute_Definition: Location of rocks of age: 0-5 Ma
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not in the specified age range
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is in the specified age range
Attribute:
Attribute_Label: AGE-2
Attribute_Definition: Location of rocks of age: 5-30 Ma
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not in the specified age range
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is in the specified age range
Attribute:
Attribute_Label: AGE-3
Attribute_Definition: Location of rocks of age: 30-45 Ma
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not in the specified age range
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is in the specified age range
Attribute:
Attribute_Label: AGE-4
Attribute_Definition: Location of rocks of age: 45-55 Ma
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not in the specified age range
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is in the specified age range
Attribute:
Attribute_Label: AGE-5
Attribute_Definition: Locations of rocks of age: 55-65 Ma
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not in the specified age range
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is in the specified age range
Attribute:
Attribute_Label: AGE-6
Attribute_Definition: Location of rocks of age: 65-76 Ma
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: Unit is not in the specified age range
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Unit is in the specified age range
Attribute:
Attribute_Label: TYPE
Attribute_Definition:
Type of rocks of hypabyssal or agglomeratic/tuffaceous character
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: H
Enumerated_Domain_Value_Definition: hypabyssal rocks
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: T
Enumerated_Domain_Value_Definition: chiefly tuff, breccia, and agglomerate
Attribute:
Attribute_Label: FEATURE_NAME
Attribute_Definition:
Name of geologic feature (e.g. Mt. Susitna Pluton), where applicable.
Attribute_Definition_Source: Latest Cretaceous and Cenozoic Magmatic Rocks of Alaska, 1994.
Overview_Description:
Entity_and_Attribute_Overview:
MAGMATIC.PAT
COLUMN    ITEM NAME       WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
 1    AREA                   4    12     F      3
 5    PERIMETER              4    12     F      3
 9    MAGMATIC#              4     5     B      -
13    MAGMATIC-ID            4     5     B      -
17    A                      2     2     B      -    FELDSPATHOID-BAS
19    B                      2     2     B      -    BASALT
21    C                      2     2     B      -    ANDESITE
23    D                      2     2     B      -    DACITE
25    E                      2     2     B      -    RHYOLITE-DACITE
27    F                      2     2     B      -    GRANITIC(INT-FEL
29    G                      2     2     B      -    GRANITIC(DOM-FEL
31    H                      2     2     B      -    GABBRO
33    AGE-1                  2     2     B      -    0-5(MA)
35    AGE-2                  2     2     I      -    5-30(MA)
37    AGE-3                  2     2     I      -    30-45(MA)
39    AGE-4                  2     2     I      -    45-55(MA)
41    AGE-5                  2     2     I      -    55-65(MA)
43    AGE-6                  2     2     I      -    65-76(MA)
45    TYPE                   2     2     C      -
47    FEATURE_NAME          44    44     C      -
In MAGMATIC.PAT, items A through H and AGE-1 through AGE-6, contain values of either "0" or "1". A value of "1" indicates that the polygon satisfies the criteria defined in the alternate names or in the Attribute_Definitions listed above. (For example; a value of"1" in the column named "D" indicates the presence of rocks of dacite composition; and a value "1" in the column labeled AGE-3 indicates the presence of rocks of 30-45 Ma age). A value of "0" means that the polygon does not satisfy the defined criteria. The item TYPE may contain the character "H" (indicating hypabyssal rocks) or the character "T" (indicating an area of chiefly tuff, breccia, and agglomerate).

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: David Pray
Contact_Position: GIS Support Staff
Contact_Address:
Address_Type: mailing and physical address
Address: 4200 University Drive
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4667
Contact_Voice_Telephone: (907)-786-7495
Resource_Description: MAGMATIC
Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. The U.S. Dept. of Interior, nor any of its agencies are liable for misuse of the data, nor for any damage, transmission of viruses or computer contamination caused through transmission of these data sets.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Format_Version_Number: 7.1
Format_Information_Content: Geologic units and types
File_Decompression_Technique: gzip -d
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile
Format_Version_Number: 1.0
Format_Information_Content: Geologic units and attributes, unprojected (geographic)
File_Decompression_Technique: unzip
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20161207
Metadata_Review_Date: 20060522
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter N Schweitzer
Contact_Organization: USGS Eastern Mineral and Environmental Resources Science Center
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: 12201 Sunrise Valley Drive
City: Reston
State_or_Province: VA
Postal_Code: 20192-0002
Country: USA
Contact_Voice_Telephone: 703-648-6533
Contact_Facsimile_Telephone: 703-648-6252
Contact_Electronic_Mail_Address: pschweitzer@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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