Michelle L Coombs, Robert G. McGimsey, Brandon L. Browne 2012 vector digital data U.S. Geological Survey Scientific Investigations Map Reston, VA U.S. Geological Survey https://pubs.usgs.gov/sim/3145 This digital publication contains the geologic map information used to publish the U.S. Geological Survey Scientific Investigations Map 3145 (Coombs and others, 2012), which depicts the geology of Mount Gareloi, Gareloi Island, Alaska. This database was constructed in order to produce a geologic map as a basis for understanding volcanic processes and hazards of Mount Gareloi. All the geologic map information used to publish the U.S. Geological Survey Scientific Investigations Map 3145 is contained in this digital database. The database includes feature classes that depict geologic map units and the contacts between them, geologic structures, and sample locations. The feature dataset GarGeology contains the feature classes GarGeoLines, GarGeoPoints, GarGeoPolys, GarStructure, GarStations, GarGeoPolysAnno, and All_samplesAnno. Additionally, the geodatabase includes a nonspatial table of geochemistry data, GarGeochem. NOTE: The GIS database for this map has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. All the geologic map information used to publish the U.S. 2003 publication date Complete As needed -178.880538 -178.721018 51.839120 51.741428 None volcanoes geology stratovolcano lava flows island explosive eruptions Alaska Aleutian Islands Mount Gareloi Island Delarof Islands None. SPATIAL RESOLUTION-Uses of this digital geologic map should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited for a scale of 1:24,000 means that higher resolution information is not present in the dataset. Plotting at scales larger than 1:24,000 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data. U.S. Geological Survey, Alaska Volcano Observatory Michelle Coombs Research Geologist mailing and physical address

4210 University Drive

Anchorage AK 99508 USA 907-786-7403 907-786-7425 mcoombs@usgs.gov U.S. Geological Survey, Alaska Volcano Observatory Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.3.0.1770 Data set has been visually inspected. All data produced strives to meet National Mapping Accuracy Standards (NMAS). Well-located data items are intended to have a horizontal positional accuracy better than 25 meters on the ground. Most lines were digitized from an orthophoto base with a cellsize of 0.5 m. The general positional accuracy of each line in the database is indicated qualitatively within the Linetype field in the Contacts feature class. Points in the database are located using hand-held GPS are are generally accurate to within 10 m. Vertical positional data are recorded for some stations and samples and were obtained using hand-held GPS units. Geologic lines representing the contacts between map units and other linear geologic features were mapped in the field in 2003 by Coombs, Browne, and McGimsey and digitized in 2005 by Coombs. Refinement of field contacts was achieved by digitzing contacts from digital satellite data provided by the US Geological Survey. Map unit polygons were created from the lines and points with unit attributes. Metadata were created only prior to release. Dataset copied. D:\Workspace\AVO\Pubs\Gareloi\GarGeology.mdb 20100517 13045500 Vector String 158 G-polygon 77 String 258 Entity point 153 G-polygon 75 G-polygon 115 Entity point 80 G-polygon 115 Entity point 80 G-polygon 77 Universal Transverse Mercator 1 0.999600 -177.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000005 0.000005 meters D_WGS_1984 WGS_1984 6378137.000000 298.257224 0.000010 Explicit elevation coordinate included with horizontal coordinates GarGeoLines Locations of contacts mapped between geologic rock units. Author OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. Linetype The nature and scientific confidence of the contact. Author contact, accurate contact, inferred water boundary SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. GarGeoPolys Polygon feature class of map units. Author OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. Unit Geologic map unit abbreviation. Author d29 Debris-flow deposits (1929) Author l29 Latite lava flows (1929) Author p29 Pyroclastic apron (1929) Author t29 Trachyte lava flows (1929) Author l87 Lava flow (1987) Author b Beach deposits Author d Fluid debris-flow deposits Author dv Viscous debris-flow deposits (Holocene) Author see Shoshonite of the early edifice (Pleistocene) Author ice Perennial ice/snow Author anf Andesite of the north flank (Pleistocene) Author pef Lithic pyroclastic flow deposits of the east flank (Holocene) Author pnp Agglutinate, spatter, and pyroclastic deposits of North Peak (Holocene - recent) Author lnpu Undivided lavas of North Peak (Holocene) Author sef Shoshonite lavas of the east flank (Late Holocene) Author lnp Sheet lava field of the north flank (Holocene) Author snw Shoshonite lavas of the northwest flank (Late Holocene) Author csp Altered crater rocks of South Peak (Holocene) Author ssp Shoshonite lava-flow field of the South Peak crater (Historical - 1950-1980) Author ssf Shoshonite dome of the south flank (Pleistocene) Author dsf Debris-flow deposits of the south flank (Historical - 1946-1980) Author asp Andesite of South Peak (late Holocene?) Author lsp Lavas of South Peak (Holocene) Author psp Pyroclastic deposits of South Peak (Holocene) Author SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. SHAPE_Area Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. Symbol Identifier for a fill symbol in an ArcGIS style file. Author Anno_3_41 Relationship class defining relationsip between GarGeoPolysAnno and GarGeoPolys. Author GarStructure Line feature class of geomorphic and structural features. Author OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. Linetype Nature and scientific confidence of the mapped linear feature. Author crater rim, certain dike, approximately located ground crack internal flow boundary landslide scarp normal fault, queried SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. GarStations Locations of field stations occupied during the mapping effort. Author OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. GEOLOGIST Name of the geologist who established the station. Author Browne, B. Coombs, M. McGimsey, G. DATE_ Date of occupation. Author STATIONID Identifier in the form GG#, where GG is a two letter abbreviation for the geologist and # is a (roughly) sequential number. Author SAMPLEID Identifier in the form YYVVGG#, where YY is a two number year value, VV is a two letter abbreviation for the volcano, GG is a two letter abbreviation for the geologist, and # is a (roughly) sequential number. Author ELEVATION_FT Elevation of the station in feet; usually collected from GPS and not verified against another source. Author SAMPLETYPE Simple rock type description of the hand sample. Author ash fall bomb bomb/lithic bulk pf (reworked) clay gabbro bomb lava lava bomb pf pf bulk sample pumice pumice fall pyroclastic pyroclastic flow deposit scoria scoria bomb scoria fall scoria lapilli soil stream sediment surge/phreatic deposit tephra xenolith bomb DESCRIPTION Longer description of the hand sample, location, geology, etc. Author UNIT Map unit from which the sample was collected., Author AR_AR Ar39/ Ar40 age of the sample. Author CHEMSPLIT True/false whether there are geochemistry results for this sample. Author Shape Feature geometry. ESRI Coordinates defining the features. GarGeoPolysAnno Feature-linked annotation class used to label features in GarGeoPolys. Automatically by ArcGIS. Author OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. FeatureID ZOrder AnnotationClassID Element SymbolID Status TextString FontName FontSize Bold Italic Underline VerticalAlignment HorizontalAlignment XOffset YOffset Angle FontLeading WordSpacing CharacterWidth CharacterSpacing FlipAngle Override SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. SHAPE_Area Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. All_samplesAnno Feature-linked annotation feature class used to label features in GarStation. Automatically by ArcGIS Author OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. FeatureID ArcGIS-managed field. Author ZOrder ArcGIS-managed field. Author AnnotationClassID ArcGIS-managed field. Author Element ArcGIS-managed field. Author SymbolID ArcGIS-managed field. Author Status ArcGIS-managed field. Author TextString ArcGIS-managed field. Author FontName ArcGIS-managed field. Author FontSize ArcGIS-managed field. Author Bold ArcGIS-managed field. Author Italic ArcGIS-managed field. Author Underline ArcGIS-managed field. Author VerticalAlignment ArcGIS-managed field. Author HorizontalAlignment ArcGIS-managed field. Author XOffset ArcGIS-managed field. Author YOffset ArcGIS-managed field. Author Angle ArcGIS-managed field. Author FontLeading ArcGIS-managed field. Author WordSpacing ArcGIS-managed field. Author CharacterWidth ArcGIS-managed field. Author CharacterSpacing ArcGIS-managed field. Author FlipAngle ArcGIS-managed field. Author Override ArcGIS-managed field. Author SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. SHAPE_Area Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. Anno_39_42 Relationship class defining a relationship between annotation in All_samplesAnno and GarStations. Author GarGeochem Whole-rock major-element-oxide (in wt percent) and trace-element (in ppm) abundances for analyzed Gareloi samples. Author SampleID Unique sample identifier, usually the station ID, some with a letter suffix. Author Unit The map unit from which the sample was collected. Author UTM_East Easting in UTM Zone 1, WGS84 Author UTM_North Northing in UTM Zone 1, WGS84 Author Sample_type Material from which the hand sample was collected. Author Field_desc Brief description of the sample location and/or the sample itself. Author Thinsxn_notes Brief description of the mineralogy as seen in a thin section from the sample. Author SiO2 TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O P2O5 Ni Cr Sc V Ba Rb Sr Zr Y Nb Ga Cu Zn Pb La Ce Th Ce1 Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Ba1 Th1 Nb1 Y1 Hf Ta U Pb1 Rb1 Cs Sr1 Sc1 Zr1 OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. This metatdata file for the GarGeology.mdb geodatabase was written to provide an overview for the complete database in its form as an ESRI ArcGIS 9.3 personal geodatabase. For more informative descriptions of the attributes please see the metadata embedded within each feature class (using ArcCatalog) or the metadata file associated with each shapefile in the shapefile version of this geodatabase. Note that if you are using the shapefile versions of the datasets contained within the geodatabase (1 field names are truncated to 10 characters and (2 only the descriptions of feature classes in this file will be relevant. That is, relationships between feature classes, as they exist as objects within the geodatabase cannot be exported to any format immediately usable with shapefiles. Spatial database objects in the geodatabase are organized within a single feature dataset called GarGeology. There are four geology feature classes, GarGeoLines, GarGeoPolys, GarStations, and GarStructure; a topology relationship class, GarGeology_topology; two annotation feature classes, All_samplesAnno and GarGeoPolysAnno; and two annotation relationship classes, Anno_39_42 and Anno_3_41. There is one nonspatial table in the geodatabase, GarGeochem, which can be joined to GarStations based on the common key field, SAMPLEID. GarGeoLines holds all geologic line features. LINETYPE is the one non-ArcGIS-managed field and stores a classifier that is also used as the symbol name in an ESRI style file. GarGeoPolys holds all geologic map unit polygons. The field UNIT carries abbreviations of the map unit name and SYMBOL is a reference to a numerical symbol name in an ESRI style file. GarStations holds points representing field locations occupied during the mapping campaign. GEOLOGIST is the name of the mapper or geologist. DATE_ carries the date of occupation. STATIONID is a unique identifier for the station in form of "GG##" where GG is a two letter abbreviation of the geologist's name and ## is a zero-padded sequential number. SAMPLEID is a unique identifier of the a sample collected at the station in the form of YYGGG##L where YY is the last two characters of the year, GGG is a three letter abbreviation of the geologist's name, ## is the same number found in the parent stationid, and L is a sequential alphabetical character used in the case of multiple samples taken at a single station. ELEVATION_FT is the elevation of the station in feet as determined by recreational-grade GPS units or base map contour. SAMPLETYPE is classifier for the sample material, if collected. DESCRIPTION is a description of the station location, sample, or both. UNIT is the map unit in which the station is located or from which the sample was collected. AR_AR is the argon40/argon39 age of the sample in thousands of years, if determined. CHEMSLPIT indicates, T = True, if a chemistry analysis was performed. Results are in GarGeochem (see below). GarStructure is feature class of linear structural features such as ground cracks or internal flow boundaries. LINETYPE carries a single value used as a classifier and a symbol name relating to an ESRI style file. GarGeologyTopology is a topology relationship class between GarGeoLines and GarGeoPolys used for the creation of features in GarGeoPolys. The two annotation feature classes and the associated relationship classes were created in ArcMap using default settings and all fields are managed automatically by ArcGIS. GarGeochem is a nonspatial table of whole-rock major-element-oxide (in wt percent) and trace-element (in ppm) abundances for analyzed samples. SAMPLEID is a key field with SampleID in GarStations and can be used for building joins or relationships. UNIT is the map unit from which the sample was collected. UTM_EAST is the easting in UTM Zone 1, WGS84. UTM_NORTH is the northing in UTM Zone 1, WGS84 This report. Downloadable Data 20090805 U.S. Geological Surve Evan Thoms Geologist mailing and physical address

4210 University Drive

Anchorage AK 99508 U.S.A. 907-786-7409 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile