Identification_Information: Citation: Citation_Information: Originator: Bull, K.F. Originator: Stevens, D.S.P. Originator: Gillis, R.J. Originator: Wolken, G.J. Originator: Balazs, M.S. Publication_Date: 2024 Title: Geology and geologic hazards in the Whittier area, Southcentral Alaska Geospatial_Data_Presentation_Form: geodatabase Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2024-4 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 21 p., 1 sheet, scale 1:50,000 Online_Linkage: https://doi.org/10.14509/31426 Description: Abstract: Geology and geologic hazards in the Whittier area, Southcentral Alaska, Preliminary Interpretive Report 2024-10, presents mapping of surficial and bedrock geology and a general assessment of natural hazards near Whittier, Alaska. The city of Whittier, Alaska (pop. ~250), is one of only two all-weather, ice-free ports that serve the Alaska mainland via both railroad and road access. The city lies about 100 km by road southeast of Anchorage near the head of Passage Canal, a deep fjord in western Prince William Sound. The hazards assessment is in support of informed community planning, mitigation, and emergency response in and around this high-risk community and its associated critical infrastructure. Fieldwork during the mapping portion of this study was conducted during eight days on the ground in 2012. Additional time was spent over two field seasons assessing specific features related to potential hazards. Outcrops were accessed by helicopter, road, and trail. Samples were collected for petrology, geochronology, and thermochronology analyses. Bedrock geology is modified from Nelson and others (1985). Surficial geology was mapped principally by the interpretation of 1:63,360-scale, false-color, infrared stereo aerial photographs taken in 1978 and refined using airborne lidar data collected in 2012. Recent satellite imagery from the Geographic Information Network of Alaska (GINA) was also utilized. Air-photo interpretations were verified by ground observations during field work in 2012. The complete report, geodatabase, and ESRI fonts and style files are available from the Alaska Division of Geological & Geophysical Surveys website: http://doi.org/10.14509/31426. Purpose: The city of Whittier, Alaska (pop. ~250), is one of only two all-weather, ice-free ports that serve the Alaska mainland via both railroad and road access. The city lies about 100 km by road southeast of Anchorage near the head of Passage Canal, a deep fjord in western Prince William Sound. The hazards assessment is in support of informed community planning, mitigation, and emergency response in and around this high-risk community and its associated critical infrastructure. Supplemental_Information: This geodatabase is organized according to the AK GeMS mapping schema Hendricks, M.D., Macpherson, A.E., Athey, J.E., Wyatt, W.C., Montayne, Simone, Buchanan, Wes, Rivera, P.G., and Steinleitner, A.M., 2024, AK GeMS data dictionary: A description of the Alaska geologic mapping schema: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 170 v. 2, 13 p. https://doi.org/10.14509/31172. The distribution package includes ESRI fonts and style files, along with usage instructions. Further documentation of the symbology is provided by Ekberg, P.G., Hendricks, M.D., and Athey, J.E., 2021, AK GeMS symbology: A description of the AK GeMS style file: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 169, 7 p. https://doi.org/10.14509/30584 Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2012 Ending_Date: 2024 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -148.837856 East_Bounding_Coordinate: -148.452537 North_Bounding_Coordinate: 60.873012 South_Bounding_Coordinate: 60.789988 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Alluvial Theme_Keyword: Alluvial Deposits Theme_Keyword: Alluvium Theme_Keyword: Bedrock Theme_Keyword: Channel Theme_Keyword: Chlorite Theme_Keyword: Clay Theme_Keyword: Contact Theme_Keyword: DGGS Theme_Keyword: Deltaic Facies Theme_Keyword: Diorite Theme_Keyword: Exhumation Theme_Keyword: Fan Theme_Keyword: Fan Delta Theme_Keyword: Feldspar Theme_Keyword: Fluvial Theme_Keyword: Flysch Theme_Keyword: Gabbro Theme_Keyword: GeMS DB L3 Compliant Theme_Keyword: GeMS DB v2 Theme_Keyword: Geochronology Theme_Keyword: Geologic Theme_Keyword: Geologic Map Theme_Keyword: Geology Theme_Keyword: Glacial Theme_Keyword: Glacial Deposits Theme_Keyword: Glaciation Theme_Keyword: Glaciers Theme_Keyword: Granite Theme_Keyword: Gravel Theme_Keyword: Greenschist Theme_Keyword: Hornblende Theme_Keyword: Hornfels Theme_Keyword: Ice Theme_Keyword: Intrusive Theme_Keyword: Lacustrine Theme_Keyword: Lacustrine Sedimentation Theme_Keyword: Lakes Theme_Keyword: Landslide Deposit Theme_Keyword: Laumontite Theme_Keyword: Liquefaction Theme_Keyword: Marine Sedimentation Theme_Keyword: Meltwater Theme_Keyword: Metamorphic Theme_Keyword: Metamorphic Rocks Theme_Keyword: Metasedimentary Rocks Theme_Keyword: Mica Theme_Keyword: Mineralogy Theme_Keyword: Minerals Theme_Keyword: Moraines Theme_Keyword: Muscovite Theme_Keyword: Outwash Theme_Keyword: Outwash Fan Theme_Keyword: Pebble Theme_Keyword: Plagioclase Theme_Keyword: Plutonic Theme_Keyword: Plutons Theme_Keyword: Pyrrhotite Theme_Keyword: Quartz Theme_Keyword: Rocks Theme_Keyword: Sand Theme_Keyword: Sandstone Theme_Keyword: Sediment Theme_Keyword: Shale Theme_Keyword: Shear Theme_Keyword: Silt Theme_Keyword: Siltstone Theme_Keyword: Strain Theme_Keyword: Subduction Theme_Keyword: Surface Theme_Keyword: Surficial Theme_Keyword: Talus Theme_Keyword: Till Theme_Keyword: Volcanic Theme_Keyword: Zircon Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Alaska Place_Keyword: Billings Creek Place_Keyword: Blackstone Bay Place_Keyword: Bur Point Place_Keyword: Cochrane Bay Place_Keyword: Cove Creek Place_Keyword: Decision Point Place_Keyword: Divide Lake Place_Keyword: Emerald Bay Place_Keyword: Emerald Island Place_Keyword: Gradual Point Place_Keyword: Hollow Bight Place_Keyword: Learnard Glacier Place_Keyword: Logging Camp Bay Place_Keyword: Lowell Glacier Place_Keyword: Maynard Mountain Place_Keyword: Neptune Point Place_Keyword: Passage Canal Place_Keyword: Placer Creek Place_Keyword: Poe Bay Place_Keyword: Port Wells Place_Keyword: Portage Creek Place_Keyword: Portage Lake Place_Keyword: Portage Mine Place_Keyword: Portage Pass Place_Keyword: Seth Glacier Place_Keyword: Shotgun Cove Place_Keyword: Squirrel Cove Place_Keyword: Squirrel Point Place_Keyword: Strong Point Place_Keyword: Trinity Point Place_Keyword: Whittier Place_Keyword: Whittier Creek Stratum: Stratum_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Stratum_Keyword: Valdez Group Temporal: Temporal_Keyword_Thesaurus: Walker, J.D., Geissman, J.W., Bowring, S.A, and Babcock, L.E., comp., 2012, Geologic Time Scale v. 4.0: Geological Society of America Temporal_Keyword: Cretaceous Temporal_Keyword: Holocene Temporal_Keyword: Tertiary Access_Constraints: This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). Use_Constraints: Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Data_Set_Credit: Geologic field investigations by M.S. Balazs, K.F. Bull, R.J. Gillis, D.S.P. Stevens, and G.J. Wolken (2012); geologic interpretation by: M.S. Balazs, K.F. Bull, R.J. Gillis, D.S.P. Stevens, and G.J. Wolken (2012); airphoto interpretation by: M.S. Balazs, K.F. Bull, R.J. Gillis, D.S.P. Stevens, and G.J. Wolken (2012); geologic GIS data layers created by: K.F. Bull, D.S.P. Stevens (2012); cartography by: A.E. Macpherson (2024); cartographic Review by: M.D. Hendricks (2024); and peer-reviewed by: M.C. Larsen (2024). We thank Pathfinder Aviation for exceptional work in difficult circumstances, and the people of Whittier for their kindness and generosity. We greatly appreciate the Chugach Alaska Native Corporation and the U.S. Forest Service for their helpfulness and access to their lands during this study. Gordon Burton was of great help in allowing us access to the Whittier tunnel, which we were, unfortunately, unable to utilize. This work was funded in part by the 2012 U.S. Geological Survey National Cooperative Geologic Mapping Program, award number G12AS00007. Geologic map conversion to the GeMS standard was funded by the USGS National Cooperative Geologic Mapping Program under STATEMAP award number G21AC10706, 2022, and the State of Alaska General Fund. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. Cross_Reference: Citation_Information: Originator: Freeman, L.K. Originator: Montayne, Simone Originator: Wypych, Alicja Publication_Date: 2017 Title: Major-oxide and trace-element geochemical data from rocks collected near Panorama Mountain, Mile 104 Seward Highway, Crow Pass, and Whittier, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2017-12 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 4 p Online_Linkage: https://doi.org/10.14509/29725 Cross_Reference: Citation_Information: Originator: Hubbard, T.D. Originator: Wolken, G.J. Originator: Stevens, D.S.P. Originator: Combellick, R.A. Publication_Date: 2013 Title: High-resolution lidar data for the Whittier area, Passage Canal, and Portage Lake, Alaska Series_Information: Series_Name: Raw Data File Issue_Identification: RDF 2013-3 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 5 p Online_Linkage: https://doi.org/10.14509/24976 Cross_Reference: Citation_Information: Originator: Nicolsky, D.J. Originator: Suleimani, E.N. Originator: Combellick, R.A. Originator: Hansen, R.A. Publication_Date: 2011 Title: Tsunami inundation maps of Whittier and western Passage Canal, Alaska Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2011-7 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 65 p., 4 sheets, scale 1:14,000 Online_Linkage: https://doi.org/10.14509/23244 Cross_Reference: Citation_Information: Originator: Nicolsky, D.J. Originator: Wolken, G.J. Originator: Combellick, R.A. Originator: Hansen, E. Publication_Date: 2011 Title: APPENDIX B: Potential rockfall-generated tsunami at Whittier, Alaska Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2011-7A Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: p. 57-65 Online_Linkage: https://doi.org/10.14509/23283 Cross_Reference: Citation_Information: Originator: Nicolsky, D.J. Originator: Suleimani, E.N. Publication_Date: 2018 Title: Potential maximum permanent flooding, Whittier, Alaska Series_Information: Series_Name: Report of Investigation Issue_Identification: RI 2011-7B Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet, scale 1:6,500 Online_Linkage: https://doi.org/10.14509/30110 Cross_Reference: Citation_Information: Originator: Wolken, G.J. Originator: Balazs, M.S. Publication_Date: 2014 Title: Inventory and preliminary assessment of geologic hazards in the Passage Canal-Portage Valley area, south-central Alaska Series_Information: Series_Name: Preliminary Interpretive Report Issue_Identification: PIR 2014-1 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 15 p Online_Linkage: https://doi.org/10.14509/27302 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Attribute fields within each feature class are populated using the map symbology and corresponding applicable values from the GeMS and AK GeMS specifications. When known, certainty in attribute interpretation is indicated in the relevant fields. Attribute accuracy varies throughout the map and is scale-dependent. Logical_Consistency_Report: All polygon features were topologically validated according to the AK GeMS geologic mapping schema specifications. Completeness_Report: This publication is a DGGS Preliminary Interpretive Report (PIR). A PIR provides timely release of maps and reports with a preliminary interpretation of geology or analytical data. Several scientists familiar with the geology of map area reviewed this product for general readability and logical consistency, but it has not undergone technical peer review. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Certainty in feature boundaries or location varies throughout the map. Data fields within each feature class and the accompanying orientation and location confidence lookup tables record the authors' degree of confidence in the location of applicable features. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Hendricks, M.D. Originator: Macpherson, A.E. Originator: Athey, J.E. Originator: Wyatt, W.C. Originator: Montayne, Simone Originator: Buchanan, Wes Originator: Rivera, P.G. Originator: Steinleitner, A.M. Publication_Date: 2024 Title: AK GeMS data dictionary: A description of the Alaska geologic mapping schema Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 170 v. 2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 13 p Online_Linkage: https://doi.org/10.14509/31172 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2024 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Hendricks, M.D. and others, 2024 Source_Contribution: GIS analysis and digital cartography Source_Information: Source_Citation: Citation_Information: Originator: Macpherson, A.E. Originator: Hendricks, M.D. Originator: Athey, J.E. Publication_Date: 2024 Title: AK GeMS Symbology: A description of the AK GeMS Style File Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 169 v. 2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 6 p Online_Linkage: https://doi.org/10.14509/31101 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2024 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Macpherson, A.E. and others, 2024 Source_Contribution: GIS analysis and digital cartography Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey National Cooperative Geologic Mapping Program Publication_Date: 2020 Title: GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps Series_Information: Series_Name: Techniques and Methods Issue_Identification: TM 11-B10 Publication_Information: Publication_Place: United States Publisher: U.S. Geological Survey Other_Citation_Details: 1 p Online_Linkage: https://dggs.alaska.gov/pubs/id/30585 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2020 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 Source_Contribution: GIS analysis and digital cartography Process_Step: Process_Description: Geologic mapping - Fieldwork during the mapping portion of this study was conducted over eight days on the ground in 2012. Additional time was spent over two field seasons assessing specific features related to potential hazards. Outcrops were accessed by helicopter, road, and trail. Samples were collected for petrology, geochronology, and thermochronology analyses. Bedrock geology is modified from Nelson and others (1985). Surficial geology was mapped principally by interpreting 1:63,360-scale, false-color, infrared stereo aerial photographs taken in 1978 and refined using airborne lidar data collected in 2012. Recent satellite imagery from the Geographic Information Network of Alaska (GINA) was also utilized. Air-photo interpretations were verified by ground observations during fieldwork in 2012. Process_Date: 2024 Process_Step: Process_Description: GIS analysis and digital cartography - This data distribution package's geologic and geographic features were organized and attributed according to the AK GeMS geologic mapping schema. The data were programmatically transformed to provide download options in three formats: (1) an AK GeMS data package that includes the complete AK GeMS database and associated files, (2) a GeMS data package that is a conversion of the AK GeMS database into the base GeMS standard published by the USGS, and (3) a shapefile data package that includes two simple shapefile representations of the data. Source_Used_Citation_Abbreviation: Hendricks, M.D. and others, 2024 Source_Used_Citation_Abbreviation: Macpherson, A.E. and others, 2024 Source_Used_Citation_Abbreviation: U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020 Process_Date: 2024 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: 6 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -147 Latitude_of_Projection_Origin: 0 False_Easting: 500000.000000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: .00000001 Ordinate_Resolution: .00000001 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: NAD83 Ellipsoid_Name: GRS 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: whitttier_ak_gems_db Entity_Type_Definition: Geodatabase, layer files, style files, and fonts Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: whitttier_ak_gems_db Detailed_Description: Entity_Type: Entity_Type_Label: whitttier_gems_db Entity_Type_Definition: Geodatabase, layer files, style files, and fonts Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: whitttier_gems_db Detailed_Description: Entity_Type: Entity_Type_Label: whitttier_gems_shapefile Entity_Type_Definition: Shapefiles and open data files Entity_Type_Definition_Source: DGGS Entity_Attribute_Layer_Name: whitttier_gems_shapefile Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Contact_Instructions: Please view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Resource_Description: PIR 2024-4 Distribution_Liability: The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product. Standard_Order_Process: Non-digital_Form: DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount. Fees: Contact DGGS for current pricing Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: geodatabase Format_Information_Content: geologic map Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.14509/31426 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20241119 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Alaska Division of Geological & Geophysical Surveys Contact_Person: Simone Montayne Contact_Position: Metadata Manager Contact_Address: Address_Type: mailing and physical Address: 3354 College Road City: Fairbanks State_or_Province: AK Postal_Code: 99709-3707 Country: USA Contact_Voice_Telephone: (907)451-5020 Contact_Facsimile_Telephone: (907)451-5050 Contact_Electronic_Mail_Address: dggspubs@alaska.gov Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Use_Constraints: If the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys. Metadata_Extensions: Online_Linkage: https://dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions