Metadata: Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: Unpublished material Title: crgeol Geospatial_Data_Presentation_Form: map Description: Abstract: This coverage represents a simplification of published reconnaisance geologic mapping of the Craig quadrangle and parts of Dixon Entrance, Ketchikan, and Prince Rupert quadrangles, Alaska. Purpose: Digital conversion of geologic mapping of the Craig quadrangle and surrounding area was undertaken 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. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1998 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -134.670 East_Bounding_Coordinate: -131.9 North_Bounding_Coordinate: 56.0 South_Bounding_Coordinate: 54.5 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: geology Theme_Keyword: bedrock Theme_Keyword: compilation Place: Place_Keyword_Thesaurus: none Place_Keyword: Alaska Place_Keyword: Craig Place_Keyword: Dixon Entrance Place_Keyword: Ketchikan Place_Keyword: Prince Rupert Access_Constraints: None Use_Constraints: This data set is preliminary and has not been reviewed for conformity with U.S. Geological Survey standards or with the North American Stratigraphic Code. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Donald Grybeck Contact_Organization: U.S. Geological Survey 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: dgrybeck@usgs.gov Data_Set_Credit: Kelly Brunt, Raytheon contractor Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The linework was captured by hand digitizing from a 1:250,000 scale mylar map. The arc and polygon attributes are based on a map compilation by D. Grybeck. The coastline was obtained from an existing coastline coverage, which was digitized at 1:250,000 scale. Accuracy of the data capture was evaluated by visual checks against the original compilation by two persons other than the person who captured the data. This thematic bedrock map depicts geologic units present beneath the 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 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 data set depicts a simplified thematic map at a scale of 1:250,000. It does not include topography, structural fold axes, annotation, strike and dip symbols, or sample locations. The coastline has been generalized and not all of the small islands and islets shown on a USGS 1:250,000 topographic map are included in this data set. 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 map compilers, and the limitations of the map. The Craig 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: Source_Information: Source_Citation: Citation_Information: Originator: Eberlein, G.D. Originator: Churkin, Michael, Jr. Originator: Carter, Claire Originator: Berg, H.C. Originator: Ovenshine, A.T. Publication_Date: 1983 Title: Geology of the Craig quadrangle, Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 83-91 Other_Citation_Details: Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A.T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, scale 1:250,000. Source_Scale_Denominator: 250000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1983 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Eberlein and others, 1983 Source_Contribution: major Source_Information: Source_Citation: Citation_Information: Originator: Gehrels, G.E. Originator: Saleeby, J.B. Publication_Date: 1986 Title: Geologic map of the southern Prince of Wales Island, southeastern Alaska Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 86-275 Other_Citation_Details: Gehrels, G.E., and Saleeby, J.B., 1986, Geologic map of the southern Prince of Wales Island, southeastern Alaska: U.S. Geological Survey Open-File Report 86-275, scale 1:63,360. Source_Scale_Denominator: 63360 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1986 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Gehrels and Saleeby, 1986 Source_Contribution: major Process_Step: Process_Description: Linework was captured by hand digitizing from a mylar map. The linework was edited and attributed using ARC/Info. The coverage was cleaned, built for polygons, 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. Process_Date: 1998 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Mineral Resource Program - Alaska Section Contact_Person: Nora Shew 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: 907-786-7445 Contact_Electronic_Mail_Address: nshew@usgs.gov 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: 8 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -135.0 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: 300 Ordinate_Resolution: 300 Planar_Distance_Units: meters Geodetic_Model: Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.9787 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The geologic units are coded numeric values in the polygon attribute table. The coded values and the labels to the geologic units are in a lookup table, 'crgeol.lut'. The item in the pat is 'class'. Here is a brief description. class geologic unit 102 water SEDIMENTARY, METAMORPHIC, AND VOLCANIC ROCKS 110 QTv Extrusive volcanic rocks (Quaternary? and Tertiary) - Mainly rhyolite to basalt in a variety of breccia bodies, tuff layers, flows, small plugs and dikes 112 MzPzm Metamorphosed sedimentary, volcanic, and intrusive rocks (Mesozoic and (or) Paleozoic) - Dark gray phyllite and fine-grained semischist; greenschist facies metamorphosed andesite and basalt flows on southern Cleveland Peninsula; amphibolitic and quartzo-feldspathic schist and gneiss to north; and few small bodies of metamorphosed diorite, quartz diorite, and gabbro 115 Trh Hyd(?) Formation (Triassic(?)) - Polymictic breccia that consists of pebble-to boulder- sized clasts of a heterogeneous suite of plutonic, metamorphic, and sedimentary rocks; possibly a submarine talus deposit. Age enigmatic; alternatively, may be Devonian 117 lPkl Klawack Fm and Ladrones Limestone, undivided (Middle and Early Pennsylvanian) - Klawack Fm consists mainly of sandstone and siltstone; the Ladrones Limestone is massive limestone. Both locally contain chert pebbles and nodules 120 Mp Peratrovich Fm (Late and Early Mississippian) - Bedded limestone with chert nodules that gradationally overlies bedded chert 122 Dpsc Port Refugio Fm (Devonian), St. Joseph Island Volcanics (Devonian?), and Coronodos Volcanics (Devonian) - Mainly graywacke, mudstone, siltstone, and shale rich in volcanic material, accompainied by basalt flows and fragmental basalt. Locally, includes fossiliferous limestone 123 Dw Wadleigh Limestone (Late, Middle, and Early Devonian) - Massive to bedded limestone with minor argillaceous limestone and calcareous shale 124 Dk Karheen Fm and related rocks (Middle? and Early Devonian) - Mainly redbed- and turbidite-facies sandstone, mudstone, shale, and polymictic conglomerate. Minor limestone. Scattered rhyolite and andesite flows, and small plugs of andesite, dacite, and diorite 125 DSs Sedimentary rocks of the Staney Creek and Tuxekan Passage area (Early Devonian? and Late to Early Silurian) - Limestone, sandstone,mudstone, and polymictic conglomerate in order of abundandance 127 Sh Heceta Limestone (Late to Early Silurian) - Reefoid limestone with minor limestone breccia, mudstone, and polymictic conglomerate 130 SOd Descon Fm and related rocks (Siluriam and Ordovician)- Volcanic graywacke, siltstone, and mudstone turbidites with interlayered volcanic breccia, extrusive domes, flows, and tuffs that consist mainly of andesite, and basalt with some dacite and rhyolite. Includes the andesitic breccia of Luck Creek. On northern Prince of Wales Island, includes small area of partly correlative Bay of Pillars Fm which consists mainly of graywacke and mudstone turbidites. 132 CZwg Wales Group (Early Cambrian and Late Proterozoic) - Greenstone, greenschist, black phyllite, quartz-sericite schist, keratophyre, and greenschist- to amphibolite-facies schist and gneiss 133 Czwm Wales Group (Early Cambrian and Late Proterozoic) - Marble PLUTONIC IGNEOUS ROCKS 135 Tm Migmatitic granitic rocks (Miocene and (or) Oligocene) - Heterogeneous suite of granitic rocks that vary in composition from granite to diorite and from migmatites to massive and unfoliated 137 Kg Granitic plutonic rocks (Cretaceous) - Mainly tonalite, diorite, quartz diorite, quartz monzodiorite, and quartz monzonite, with several bodies of gabbro 138 Kugb Zoned mafic-ultramafic complex of Union Bay (Early Cretaceous) - Gabbro 139 Kudp Zoned mafic-ultramafic complex of Union Bay (Early Cretaceous) - Dunite, pyroxenite, and peridotite 142 Jp Plutonic rocks (Middle Jurassic) - Peralkaline granite of Bokan Mountain and syenite at Dora Bay 145 PlPsy Syenite (Early Permian and Late Pennsylvanian) - Syenite near Klawock and leucosyenite on Sukkwan Island 147 SOg Granitic to mafic plutonic and metamorphic rocks (Late to Early Silurian and Late Ordovician) - Heterogeneous unit that includes granite, syenite, quartz monzonite, leucodiorite, diorite, quartz diorite, gabbro, hornblendite, trondhjemite, and pyroxenite. Also includes correlative metamorphic rocks at Kendrick Bay that consist mainly of gneiss, schist, and amphibolite 150 Og Granitic plutonic rocks (Late and Middle Ordovician) - Mainly quartz diorite, granodiorite, leucogranodiorite, and quartz monzonite. also includes small body of foliated metagabbro and metadiorite with minor metavolcanic and metasedimentary rocks on southern Prince of Wales Island 152 Cg Foliated granitic to mafic plutonic rocks (Early Cambrian) - Foliated quartz diorite, granodiorite, diorite, and gabbro The stratigraphic contacts and faults are coded numeric values in the arc attribute table as item 'arc-code'. The following list describes the arc-codes used in this coverage. arc-code 1 stratigraphic contact certain 7 shoreline or riverbank 10 thrust fault, certain, teeth on right from origin 30 fault, unknown offset, certain location 31 fault, unknown offset, approximate location 51 concealed contact 52 concealed fault 53 concealed thrust fault 99 bounding line of coverage Entity_and_Attribute_Detail_Citation: Eberlein and others, 1983 Gerhels and Saleeby, 1986 Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Donald Grybeck Contact_Organization: U.S. Geological Survey Mineral Resource Program - Alaska Section 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 Distribution_Liability: This coverage has not been through the USGS review process and should not be distributed. Metadata_Reference_Information: Metadata_Date: 19981123 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Mineral Resource Program - Alaska Section Contact_Person: Nora Shew 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: 907-786-7445 Contact_Electronic_Mail_Address: nshew@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: June 8, 1994