Identification_Information: Citation: Citation_Information: Originator: Mulliken, K.M. Originator: Schaefer, J.R. Originator: Cameron, C.E. Publication_Date: 2018 Title: Geospatial distribution of tephra fall in Alaska: a geodatabase compilation of published tephra fall occurrences from the Pleistocene to the present Geospatial_Data_Presentation_Form: digital data Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 164 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 46 p. Online_Linkage: http://doi.org/10.14509/29847 Description: Abstract: Tephra fall (volcanic ash) studies are a key component to understanding the frequency and magnitude of volcanic eruptions and conducting volcano-hazard assessments. In addition, many interdisciplinary studies rely on tephra fall deposits as time-stratigraphic markers. Information on tephra deposits in Alaska has previously been dispersed amongst hundreds of publications that span numerous research disciplines. In order to streamline tephra occurrence data, information from these disparate publications have been compiled into one comprehensive geospatial dataset. Pleistocene, Holocene, and historical tephra deposit distribution information has been digitized for more than 120 published resources, including peer-reviewed articles, reports, and theses/dissertations. The dataset includes tephra fall distribution information pertaining to 39 eruptions from at least 19 volcanoes in Alaska. All files can be downloaded free of charge from the DGGS website (http://doi.org/10.14509/29847). Purpose: Tephra fall (volcanic ash) studies are a key component to understanding the frequency and magnitude of volcanic eruptions and conducting volcano-hazard assessments. In addition, many interdisciplinary studies rely on tephra fall deposits as time-stratigraphic markers. Information on tephra deposits in Alaska has previously been dispersed amongst hundreds of publications that span numerous research disciplines. In order to streamline tephra occurrence data, information from these disparate publications have been compiled into one comprehensive geospatial dataset. Supplemental_Information: >alaska_tephra_contours: polylines representing digitized tephra fall contours >alaska_tephra_footprints: polygons representing maximum tephra fall distribution extents >geodiva_stations_12072017: points that represent tephra sample locations >table_alaska_tephra_contours_figures: list of figures with data that was digitized, with figures attached for user reference >table_geodiva_samples_12072017: list of tephra samples and metadata >table_references: list of references for all digitized data >relationship_classes: geodatabase relationship classes that associate feature classes/tables to each other >layer-files: layer files provide pre-queried data on deposit contours, maximum distribution footprints, tephra sample locations, and vent locations. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1964 Ending_Date: 2016 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -178.817961 East_Bounding_Coordinate: -104.060291 North_Bounding_Coordinate: 71.277684 South_Bounding_Coordinate: 43.359849 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Theme_Keyword: Aerial Theme_Keyword: Ash Cloud Theme_Keyword: Ash Fall Theme_Keyword: Correlation Theme_Keyword: Eolian Theme_Keyword: Geochemistry Theme_Keyword: Geochronology Theme_Keyword: Geodatabase Theme_Keyword: Geologic Theme_Keyword: Geologic Hazards Theme_Keyword: Geological Process Theme_Keyword: Geology Theme_Keyword: Geomorphology Theme_Keyword: Hazards Theme_Keyword: Methods Theme_Keyword: Stratigraphy Theme_Keyword: Surface Theme_Keyword: Tephra Theme_Keyword: Tephrochronology Theme_Keyword: Tephrostratigraphy Theme_Keyword: Volcanic Theme_Keyword: Volcanoes Theme_Keyword: Volcanology Place: Place_Keyword_Thesaurus: Alaska Division of Geological & Geophysical Surveys Place_Keyword: Aniakchak Place_Keyword: Augustine Place_Keyword: Crater Peak Place_Keyword: Emmons Lake Place_Keyword: Fisher Place_Keyword: Hayes Place_Keyword: Kaguyak Place_Keyword: Katmai Place_Keyword: Mageik Place_Keyword: Makushin Place_Keyword: Mount Churchill Place_Keyword: Mount Edgecumbe Place_Keyword: Novarupta Place_Keyword: Okmok Place_Keyword: Pavlof Place_Keyword: Redoubt Place_Keyword: Shishaldin Place_Keyword: Spurr Place_Keyword: Ukinrek 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: Holocene Temporal_Keyword: Pleistocene 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 Data_Set_Credit: As a compilation of previously published data, this project is built on a foundation of work done by other scientists. The list of authors whose work contributed to this database would be too extensive to cite here, but each is credited in the reference table of the dataset. We would like to thank Patricia Gallagher (DGGS), Mike Hendricks (DGGS), and Kristi Wallace (USGS-AVO) for their review of this publication. This project was funded through DGGS cooperative agreements with the USGS Volcano Hazards Program, grant numbers G16AC00054 and G16AC00165. The Alaska Volcano Observatory is a joint program of the U.S. Geological Survey, the Geophysical Institute of the University of Alaska Fairbanks, and the State of Alaska Division of Geological & Geophysical Surveys. Cross_Reference: Citation_Information: Originator: Cameron, C.E. Originator: Nye, C.J. Publication_Date: 2014 Title: Preliminary database of Quaternary vents in Alaska Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 153 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 11 p Online_Linkage: http://doi.org/10.14509/27357 Cross_Reference: Citation_Information: Originator: Cameron, C.E. Originator: Schaefer, J.R. Publication_Date: 2016 Title: Historically active volcanoes of Alaska Series_Information: Series_Name: Miscellaneous Publication Issue_Identification: MP 133 v. 2 Publication_Information: Publication_Place: Fairbanks, Alaska, United States Publisher: Alaska Division of Geological & Geophysical Surveys Other_Citation_Details: 1 sheet Online_Linkage: http://doi.org/10.14509/20181 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: This dataset is a compilation of data from numerous publications. Individual publications report geochronologic information in different ways, with no uniform standards, resulting in a variety of formats that make it difficult to design query-friendly age data fields. In addition, as eruption histories are refined with more study and improved dating techniques, so are the ages of specific tephra deposits. Therefore, in this report, we present ages from the original reference that the contour was digitized from, as well as a "best age." Sometimes the original reference is the only age reported and therefore it is also the best age. However, the best age may alternatively be from a more recent publication (i.e., the date reported in the publication with the tephra geospatial information is no longer an accepted age for that deposit/eruption). Ages listed in this dataset are meant to guide researchers, who are encouraged to refer to original publications for more detail on deposit geochronology. Logical_Consistency_Report: Referential integrity among the tables is enforced by the geodatabase system. Completeness_Report: Development of this database is ongoing. As new publications are released that contain tephra distribution data, this dataset compilation will become outdated. The GeoDIVA Alaska Tephra Database is continually updated. Therefore, the static station and samples exported from GeoDIVA on December 7, 2017, and incorporated in this database will eventually be non-comprehensive. We intend to update this dataset to incorporate new data as new datasets are published. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: This dataset is a compilation of data from numerous publications and thus has limitations. The accuracy of tephra deposit contours is dependent on the original publications from which the tephra fall distributional data were digitized. Table 2 in the accompanying report presents a list of references with figures that were difficult to digitize and tephra fall unit footprints that were difficult to derive. Geospatial accuracy issues arose when contours and sample locations were digitized from very small, manually georeferenced illustrations and map figures. However, these accuracy issues have been mitigated by using landmark cities, vent locations, major geographic features, geopolitical boundaries, roads, and rivers as a means to quality-control digitization of data from small illustrations and maps. Lineage: Process_Step: Process_Description: Data compilation - As part of an extensive literature review undertaken during population of the Alaska Tephra Database, more than 100 publications containing illustrations or maps with information on the occurrence and distribution of tephra in Alaska were identified. From these publications, approximately 225 figures were saved as individual JPEGs, georeferenced, and contours on the figures were digitized. Tephra contours, footprints, and occurrences were digitized as individual polylines, polygons, and point shapefiles, which were compiled into an ESRI ArcGIS file geodatabase. Relevant metadata garnered from the original publications are documented in tables that now reside in the geodatabase and have established relationships with a table that contains the full references. See accompanying report for additional information about the data compilation methodology and a comprehensive bibliography of data sources. Process_Date: 2017 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Alaska Albers 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 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.0000000030536018158500163 Ordinate_Resolution: 0.0000000030536018158500163 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: GRS 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257222101000025 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: alaska_tephra_contours Entity_Type_Definition: polylines representing digitized tephra fall contours; file type: ArcGIS feature class Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Alaska Volcano Observatory Entity_Attribute_Layer_Name: alaska_tephra_contours Attribute: Attribute_Label: tephraname Attribute_Definition: Informal name of the tephra unit. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: sub_unit Attribute_Definition: Contour specific to a subset of the tephra unit (e.g., differences within a deposit thought to represent a specific phase of an eruption, a specific day during a historical eruption, or a distinct feature of a deposit thought to represent a change in the eruption). Value is blank if the contour describes the unit as a whole. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: sourcevolc Attribute_Definition: If the tephra unit has a known potential source vent. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: isopach_cm Attribute_Definition: Contour line denotes isopach (equal deposit thickness), given in cm. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: mass_gm2 Attribute_Definition: Contour line denotes isomass (equal mass-per-unit-area of tephra fall), in grams per square meter. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: pleth_cm Attribute_Definition: Contour line denotes isopleth (equal maximum grain size, pumice size, or lithic size deposition), given in cm (if given, particle type is noted in the map_info field). Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: map_info Attribute_Definition: If the digitized map or illustration contained additional useful metadata, it is detailed here. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: comments Attribute_Definition: Comments by the digitizer. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: citation Attribute_Definition: Citation for the reference that the contour was digitized from. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: age_epoch Attribute_Definition: Age epoch of the deposit/eruption (Pleistocene, Holocene, Alaska historical). Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: age_in_ref Attribute_Definition: Age of deposit/eruption as reported in the reference that the contour is digitized from. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: best_age Attribute_Definition: This value may be a deposit age estimate provided in a more recent reference or may be the same as the age estimate provided in the reference that the contour was digitized from. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: age_cit Attribute_Definition: Citation for the reference of the age reported in the best_age field. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: age_notes Attribute_Definition: Comments on the age determination of the tephra deposit. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: fig_num Attribute_Definition: Figure number that the contour was digitized from, in the original reference. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: fig_scale Attribute_Definition: Scale of the figure that the contour was digitized from, in the original reference. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: other_cits Attribute_Definition: A list of citations for other references that the contour has appeared in. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: citationid Attribute_Definition: Unique numeric identifier that allows the contour to be linked with the reference it was digitized from. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Double Detailed_Description: Entity_Type: Entity_Type_Label: alaska_tephra_footprints Entity_Type_Definition: polygons representing maximum tephra fall distribution extents; file type: ArcGIS feature class Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Alaska Volcano Observatory Entity_Attribute_Layer_Name: alaska_tephra_footprints Attribute: Attribute_Label: tephraname Attribute_Definition: Informal name of the tephra unit. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: sourcevolc Attribute_Definition: If the tephra unit has a potential source vent. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: citations Attribute_Definition: A list of citations for the references that the footprint was derived from. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: age_epoch Attribute_Definition: Age epoch of the deposit/eruption (Pleistocene, Holocene, Alaska historical). Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: best_age Attribute_Definition: This value may be a deposit age estimate provided in a more recent reference or may be the same as the age estimate provided in the reference that the contour was digitized from. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: age_cit Attribute_Definition: Citation for the reference of the age reported in the best_age field. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: age_notes Attribute_Definition: Comments on the age determination of the tephra deposit. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: prox_desc Attribute_Definition: If available, a proximal description of the deposit. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: prox_cit Attribute_Definition: Citation for the reference of the proximal deposit description. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: dist_desc Attribute_Definition: If available, a distal description of the deposit. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: dist_cit Attribute_Definition: Citation for the reference of the distal deposit description. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: comments Attribute_Definition: Comments by the digitizer. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: footprntid Attribute_Definition: Unique numeric identifier that allows the footprint to be linked with the references that it was derived from. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Double Detailed_Description: Entity_Type: Entity_Type_Label: geodiva_stations_12072017 Entity_Type_Definition: points that represent tephra sample locations; file type: ArcGIS feature class Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Alaska Volcano Observatory Entity_Attribute_Layer_Name: geodiva_stations_12072017 Attribute: Attribute_Label: stationid Attribute_Definition: The alphanumeric descriptor of the sample's station. For samples published without a station identifier, we use the sample's id as a station id. For stations with generic names (1, 2, 3, a, b, c, etc.), we assign the station with the nomenclature: first author last name_publication year_station number. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: lat_nad83 Attribute_Definition: Latitude of sample location, if known (NAD83 datum). Sometimes, these coordinates are imprecise because they were georeferenced from a figure or approximated based on a location description. If so, it is noted in the description. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Double Attribute: Attribute_Label: long_nad83 Attribute_Definition: Longitude of sample location, if known (NAD83 datum). Sometimes, these coordinates are imprecise because they were georeferenced from a figure or approximated based on a location description. If so, it is noted in the description. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Double Attribute: Attribute_Label: geologist Attribute_Definition: Name of the geologist who visited the station and collected the sample, if known. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: volcano Attribute_Definition: If the station that was visited was on a volcano, the volcano name is specified here. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: visitdate Attribute_Definition: Date the sample was collected. Sometimes only the year is known. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: stationdes Attribute_Definition: Text description of the sample locality, if published. If no sample location was published, a specific volcano name or geographic area may be entered. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: stationcom Attribute_Definition: Comments about the station. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Detailed_Description: Entity_Type: Entity_Type_Label: table_alaska_tephra_contours_figures Entity_Type_Definition: list of figures with data that was digitized, with figures attached for user reference; file type: ArcGIS table Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Alaska Volcano Observatory Entity_Attribute_Layer_Name: table_alaska_tephra_contours_figures Attribute: Attribute_Label: CONTENT_TYPE Attribute_Definition: Describes the attachment type (image/jpeg for all). Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: ATT_NAME Attribute_Definition: Name of the file that is attached. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: DATA_SIZE Attribute_Definition: Size of the attachment. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Long Integer Attribute: Attribute_Label: DATA Attribute_Definition: Data type. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Blob Detailed_Description: Entity_Type: Entity_Type_Label: table_geodiva_samples_12072017 Entity_Type_Definition: list of tephra samples and metadata; file type: ArcGIS table Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Alaska Volcano Observatory Entity_Attribute_Layer_Name: table_geodiva_samples_12072017 Attribute: Attribute_Label: sampleid Attribute_Definition: Alphanumeric descriptor of the sample. For samples with generic names (1, 2, 3, a, b, c, etc.), we assign the sample name with the nomenclature: first author last name_publication year_sample number. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: stationid Attribute_Definition: The alphanumeric descriptor of the sample's station. For samples published without a station identifier, we use the sample's id as a station id. For stations with generic names (1, 2, 3, a, b, c, etc.), we assign the station with the nomenclature: first author last name_publication year_station number. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: at_num Attribute_Definition: Alphanumeric ID assigned by the Alaska Tephra Lab. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: sourcevolc Attribute_Definition: If the tephra unit has a potential source vent. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: samp_date Attribute_Definition: Date the sample was collected. Sometimes only the year is known. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: samptype Attribute_Definition: samptype and sampletype2 describe the physical sample type. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: samptype2 Attribute_Definition: samptype and sampletype2 describe the physical sample type. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: age_epoch Attribute_Definition: Age epoch of the deposit/eruption (Pleistocene, Holocene, Alaska historical). Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: color Attribute_Definition: Color of the sample, if provided. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: tephraname Attribute_Definition: Informal name of the tephra unit. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: alt_tephra Attribute_Definition: Some tephra units have been given multiple names, this field provides an alternate tephra name for those samples with multiple tephra unit names. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: name_comm Attribute_Definition: Comments on the tephra unit name. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: sampdes Attribute_Definition: Text description of the sample, if published. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Attribute: Attribute_Label: sampcom Attribute_Definition: Comments about the sample. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Detailed_Description: Entity_Type: Entity_Type_Label: table_references Entity_Type_Definition: list of references for all digitized data; file type: ArcGIS table Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Alaska Volcano Observatory Entity_Attribute_Layer_Name: table_references Attribute: Attribute_Label: citationid Attribute_Definition: Unique numeric identifier that allows the reference to be linked to derived data. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Double Attribute: Attribute_Label: reference Attribute_Definition: Full reference. Attribute_Definition_Source: this report Attribute_Domain_Values: Unrepresentable_Domain: Text Detailed_Description: Entity_Type: Entity_Type_Label: relationship_classes Entity_Type_Definition: geodatabase relationship classes that associate feature classes/tables to each other; file type: ArcGIS relationship classes Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Alaska Volcano Observatory Entity_Attribute_Layer_Name: relationship_classes Detailed_Description: Entity_Type: Entity_Type_Label: layer-files Entity_Type_Definition: layer files provide pre-queried data on deposit contours, maximum distribution footprints, tephra sample locations, and vent locations. See accompanying report for detailed listing of the layer files available with this publication.; file type: ArcGIS layer files Entity_Type_Definition_Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Alaska Volcano Observatory Entity_Attribute_Layer_Name: layer-files 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 Resource_Description: MP 164 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, ArcMap document, and ArcGIS layer files Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://doi.org/10.14509/29847 Fees: Free download Metadata_Reference_Information: Metadata_Date: 20180622 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Person: Simone Montayne 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 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: http://www.dggs.alaska.gov/metadata/dggs.ext Profile_Name: dggs metadata extensions