Geologic map of the Seldovia quadrangle, south-central Alaska

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Bradley, D.C.

Originator: Kusky, T.M.

Originator: Haeussler, P.J.

Originator: Karl, S.M.

Originator: Donley, D.T.

Publication_Date: 1999

Title:

Geologic map of the Seldovia quadrangle, south-central Alaska

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name: U.S. Geological Survey Open-File Report

Issue_Identification: OFR 99-18B

Other_Citation_Details:

Bradley, D.C., Kusky, T.M., Haeussler, P.J., Karl, S.M., and Donley, D.T., 1999, Geologic map of the Seldovia quadrangle, south-central Alaska: U.S. Geological Survey Open-File Report 99-18B, 1 sheet, scale 1:250,000.

Description:

Abstract:

USGS Open-File Report 99-18B is a digital representation of a paper map that is being released simultaneously, USGS Open-File Report 99-18A. The map shows the bedrock geology of the Seldovia quadrangle, Alaska, at a scale of 1:250,000, compiled from new mapping (1988-1993) and published sources. Digital files include various map coverages in Arc/Info export format, and a picture of the map plus all map-collar information in Adobe Illustrator and PDF formats. The map collar includes detailed map-unit descriptions, text on the physiography, neotectonics, geologic history, and economic geology, cross-section, correlation of map units chart, and map showing original sources of information.

Purpose:

Digital representation of geologic mapping of the Seldovia quadrangle, Alaska, is to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, however the geological data in this coverage is not intended for use at a scale larger that 1:250,000.

Supplemental_Information:

The 1:63,360 scale geologic maps (ink or mylar topographic bases), from which the present map was compiled, are housed at the U.S. Geological Survey, 4200 University Drive, Anchorage, Alaska 99508. These show more detail than the present map, which was simplified, in places, for display at 1:250,000 scale.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1999

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -153.0

East_Bounding_Coordinate: -150.0

North_Bounding_Coordinate: 60.0

South_Bounding_Coordinate: 59.0

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: geology

Theme_Keyword: bedrock

Theme_Keyword: compilation

Theme_Keyword: reconnaissance

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Seldovia

Place_Keyword: south-central Alaska

Place_Keyword: Alaska

Access_Constraints: None

Use_Constraints:

Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Dwight C. Bradley

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 4200 University Drive

City: Anchorage

State_or_Province: AK

Postal_Code: 99508-4667

Country: U.S.A.

Contact_Voice_Telephone: (907)561-1181

Contact_Electronic_Mail_Address: dbradly@usgs.gov

Data_Set_Credit:

Digital representation by Kelly Brunt (Raytheon STX contractor), D. Thomas Donley, and Patti Phillips

Native_Data_Set_Environment:

This dataset was created using ESRI ARC/Info version 7 on a Unix platform.

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The linework was captured by hand digitizing from 1:63,360 scale mylar maps that were all in excellent condition. The arc and polygon attributes are based on field work and on previously published mapping that is cited, as appropriate, on an inset of the PDF and Illustrator files. Water bodies were digitized from the 1:63,360 scale topographic maps. Glaciers and permanent icefields were digitized from 1:63,360 scale topographic maps, but were modified as needed, based on 1978-1984 vintage air photos, where glacial retreat had been significant. The digital coastline, provided by the State of Alaska, Dept. of Natural Resources, was based on 1:63,360 topographic maps. This digital data set was prepared in the aftermath of the Exxon Valdez oil spill. The source of line- and polygon data is not coded in attribute tables. The map was checked for accuracy by visually comparing the digital product against hand-colored ozalids of the mylars. This thematic bedrock map depicts geologic units present beneath soil or relatively thin mantles of surficial deposits, not necessarily the surficial materials themselves.

Logical_Consistency_Report:

This coverage is a net coverage containing arcs and polygons. Each polygon has a class attribute classifying bedrock, surficial deposit, or water/ice body. Faults and stratigraphic contacts are represented as arcs. When a fault is also a stratigraphic contact, only a single arc is present. Dangling arcs may be present (faults, dikes, etc.)

Completeness_Report:

This set of digital coverages contains only the information used to create the geologic map. It does not include the files used to create the information shown in collar, or margins, of the paper version and graphic versions of the complete publication.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Users of this digital geologic map should respect the intentions of the original mappers and the limitations of the map. The Seldovia geologic map is intended to be used at a scale of 1:250,000; it is not intended to be used at a more detailed scale.

Lineage:

Process_Step:

Process_Description:

Linework was captured by hand digitizing from a stable base line drawing. The digital linework was edited and attributed using ARC/Info. The coverage was built for polygon topology, and had labels created and attributed. For the purpose of distribution, the coverage has been converted to an interchange format file using the ARC/Info export command. The following files are included:

(1) svgeol.e00 geology (arcs and polygons)
(2) svfold.e00 fold axial traces
(3) svisograd.e00 metamorphic isograds
(4) svquad.e00 outlines of 1:63,360 scale quadrangles
(5) svsandd.e00 attitudes of bedding and foliation
(6) svtopo.e00 vectorized contours, not shown over glaciers
(7) svwells.e00 exploration wells

Process_Date: 1999

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 5

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -153.0

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 50

Ordinate_Resolution: 50

Planar_Distance_Units: meters

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: arc-code

Entity_Type_Definition:

Arc-code is a positive integer value (3 3 I) item in the arc attribute table. Values range from 1-99. It codes the type of line feature. The following arc-code values are used in svgeol.aat.

1 Stratigraphic or intrusive contact, location certain
2 Stratigraphic or intrusive contact, location approximate or inferred
4 Normal fault, location certain
5 Normal fault, location approximate or inferred
7 Shoreline or riverbank
9 Boundary of melange zone (invisible line, used to enclose an overprinting pattern)
11 Thrust fault, location approximate, teeth on right from origin
15 Ice contact
30 Fault, sense of displacement unknown, location certain
32 Fault, sense of displacement unknown, location approximate or inferred
49 Dike, Early Cretaceous
50 Dike, Tertiary
51 Stratigraphic or intrusive contact, concealed by younger deposits
52 Fault, sense of displacement unknown, concealed by younger deposits
53 Thrust fault, teeth on right from origin, concealed by younger deposits
88 Right-lateral fault, location approximate or inferred
91 Left-lateral fault, location approximate or inferred
99 Bounding line

Entity_Type_Definition_Source: This report.

Detailed_Description:

Entity_Type:

Entity_Type_Label: class

Entity_Type_Definition:

Class is a positive integer value (4 5 B) item in the polygon attribute table. Values range from 0-1071. The coverage has a lookup table, svgeol.lut, which contains each class value with a geologic unit label. Here is a list of class values with a brief description. See the publication for full rock unit descriptions.

1 Ice
10 Jsm - Seldovia metamorphic complex (Early Jurassic metamorphic age)
32 Jc - Chinita Formation (Upper Jurassic, Callovian)
47 Jn - Naknek Formation (Upper Jurassic, Oxfordian to Kimmeridgian)
50 Jtu - Tuxedni Group (Middle to Upper Jurassic, Bajocian to Callovian)
57 Water
60 JTrp - Port Graham Formation (Upper Triassic and Lower Jurassic)
67 Jt - Talkeetna Formation (Lower Jurassic; Hettangian to Toarcian)
71 Kv - Valdez Group
72 Kk - Kaguyak Formation (Upper Cretaceous, Maastrichtian)
74 KPmc - McHugh Complex, chert and basalt (Triassic to Cretaceous)
75 KPms - McHugh Complex, graywacke and conglomerate (Jurassic to Cretaceous)
77 KPm - McHugh Complex, undivided (Permian to Cretaceous)
78 Tb - Beluga Formation (Miocene)
79 Twf - West Foreland Formation (Eocene)
80 Ts - Sterline Formation (Miocene to Pliocene)
81 Tt - Tyonek Formation (Oligocene to Miocene)
82 Qs - Surficial deposits (Quaternary)
105 Qv - Iliamna lava flows (Quaternary)
110 Mu - Ultramafic plutonic rocks (Mesozoic)
111 Jd - Diorite of Point Bede (Jurassic)
112 Mg - Gabbro (Mesozoic)
113 Tg - Granodiorite (Eocene)
115 J(?)f - Felsite (Jurassic?)
116 Jto - Tonalite of Dogfish Bay (Jurassic)
1071 Kvm - Melange of Iceworm Peak (Upper Cretaceous)
Kd - Intermediate dike (Early Cretceous) (although this is a legitimate map unit, the rock bodies are too narrow to map as polygons, hence are shown as lines with arc-code = 49)
Td - Intermediate, felsic, and mafic dikes (Tertiary) (although this is a legitimate map unit, the rock bodies are too narrow to map as polygons, hence are shown as lines with arc-code = 50)

Entity_Type_Definition_Source: This publication.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: USGS Information Services

Contact_Address:

Address_Type: mailing address

Address:

Box 25286 Denver Federal Center

City: Denver

State_or_Province: CO

Postal_Code: 80225-0046

Country: USA

Contact_Voice_Telephone: 303-202-4200 or 1-888-ASK-USGS

Resource_Description:

USGS OFR 99-18A - paper version; USGS OFR 99-18B - digital version

Distribution_Liability:

Although all this data has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the acccuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ARCE

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <https://pubs.usgs.gov/of/1999/of99-018/>

Fees: Free

Metadata_Reference_Information:

Metadata_Date: 19990503

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Nora B. Shew

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 4200 University Drive

City: Anchorage

State_or_Province: AK

Postal_Code: 99508-4667

Country: U.S.A.

Contact_Voice_Telephone: (907)561-1181

Contact_Electronic_Mail_Address: nshew@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998