Bundtzen, T.K. Harris, E.E. Gilbert, W.G. 1997 map and vector digital data Report of Investigations RI 97-14A Fairbanks, Alaska - USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 34 pp., 1 sheet, scale 1:125,000 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2549 This map is a compilation of previously unpublished and published data, as well as from updated field mapping. This publication offers a 1:125,000-scale map sheet accompanied by a booklet containing a summary of the geology, a colored terrane map, map unit descriptions, a summary table listing selected mineral deposits and energy resources, references, and a correlation of map units. The text (in the report) describes the geology and resource potential of a highly mineralized region centered in the Farewell silver-lead-zinc district southeast of McGrath. Potentially important coal resources flanking the Alaska Range are also described in the map area. This project and resulting report, map and layers are intended to provide a geologic map and a geologic interpretation of the eastern half of the McGrath Quadrangle at 1:125,000 scale. Companies involved in or considering mineral exploration in the McGrath area will find this map useful, as well as persons examining the region's coal resources as a potential fuel for local heat and power development. The layers listed below are present as ArcGIS shape files. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Basic unit information is also included in the geologic unit code set file "RI1997-14_codeset.pdf." Layers include: >mcggeog_arc geologic map unit contacts (arc) >mcggeog_poly geologic map unit contacts (polygon) >mcgflt_arc fault location traces and types >mcgglacial_arc glacial extents >mcgcline_arc anticline and syncline traces of axial planes >mcgdike_arc dike locations and probable lengths >mcgstrsym_point points for the strike, dip, and plunge of bedding planes, foliation, and various lineaments >mcgstrdip_point point attribute table that displays strike and dip information >mcgmine_point location of selected mineral deposits and energy resources 19800701 19970630 June 20, 1997 (publication date) complete none planned -154.628732 -152.883844 63.025637 61.962990 ISO 19115 Topic Category geoscientificInformation none Alluvial Deposits Colluvial Deposits Eolian Geologic Hazards Geologic Materials Geology Glacial Deposits none Alaska, State of McGrath none Denali-Farewell Fault Dillinger Terrane Farewell Terrane Kahiltna Terrane McKinley Terrane Middle Fork Plutonic Complex Mystic Terrane Pingston Terrane Post River Pluton Veleska Lake Volcanic Complex Yukon-Tanana Terrane none Cambrian Carboniferous Cenozoic Cretaceous Devonian Early Devonian Early Jurassic Early Silurian Jurassic Late Devonian Late Permian Late Silurian Mesozoic Middle Devonian Ordovician Paleozoic Permian Proterozoic Quaternary Silurian Tertiary Triassic This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below). 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. 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. State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys GIS Data Manager/Cartographer mailing and physical

3354 College Road

Fairbanks AK 99709-3707 (907) 451-5029 (907) 451-5020 (907) 451-5050 dggspubs@alaska.gov You may view our web site at http://www.dggs.dnr.state.ak.us for the latest information on available data. Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change. This map synthesis was partially supported by the U.S. Geological Survey's National Mapping Program under cooperative agreement 1434-HQ-96-AG-01471. 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. Additional Acknowledgments: Bedrock geology field investigations by T.K. Bundtzen (1980-1984,1988-1989,1993), W.G. Gilbert (1981-1984,1989), E.E. Harris (1988-1989,1993), D.N. Solie (1981-1982,1984,1988-1989), and J.T. Kline (1980-1982,1988-1989). Additional field contributions by M.S. Lockwood(1982-1983), J.G.Clough(1981,1983), T.E. Smith(1982-1983), Kate Bull (1981-1982), K.M. McDonald (1982), Kristin Kline (1981), D.B. Dickey (1981), John Ebel (1982), Larry Lueck (1980), G.M. Laird (1989), Grant Abbot (1989,1993), S.P. Gordey (1989), R.B. Blodgett (1982-1983,1989), D.J. Szumigala (1983), and Carolyn Parker (1983). Surficial geology field investigations by J.T. Kline (1980-1982,1988-89) and T.K. Bundtzen (1981-1984, 1988). Map synthesis and compilation by E.E. Harris and T.K. Bundtzen; Technical review by M.L. Miller and R.A. Combellick; Electronic digital cartography by A.M. McCarthy and G.R.C. Graham; Color design by Ann-Lillian Schell; Editing done by Paula K. Davis. ArcInfo, ArcGIS post-version 7.0, and any text editor. Kline, J.T. Pinney, D.S. 1997 map Report of Investigations RI 97-14B Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 1 sheet, scale 1:125,000 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2550 Kline, J.T. Bundtzen, T.K. 1986 Anchorage, AK, USA Geological Society of Alaska p. 123-150 Hamilton, T.D. (ed.) Reed, K.M. (ed.) Thorson, R.M. (ed.) 1986 Anchorage, AK, USA Geological Society of Alaska Bundtzen, T.K. Kline, J.T. Clough, J.G. 1982 map Alaska Open-File Report 149 AOF 149 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 25 pp., 1 sheet, scale 1:40,000 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=69 Gilbert, W.G. Solie, D.N. Kline, J.T. Dickey, D.B. 1990 map Professional Report 102 PR 102 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 2 sheets, scale 1:63,360 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2283 Bundtzen, T.K. Kline, J.T. Smith, T.E. Albanese, M.D. 1987 map Professional Report 91 PR 91 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 20 pp., 1 sheet, scale 1:63,360 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2272 Gilbert, W.G. Solie, D.N. Kline, J.T. 1988 map Professional Report 92 PR 92 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 2 sheets, scale 1:63,360 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2273 Data for geologic layers was digitized off of a mylar geologic compilation. This compilation was done on a stable mylar of the USGS topographic base for the McGrath Quadrangle, Alaska that was photographically enlarged to 1:125,000. (Topographic base compiled in 1965, revised in 1978, 1980, and 1982.) Geologic data included in the compilation are the field maps and notes from this project as well as data from other sources as noted in the "Sources Cited" section. Polygon topology present and clean on appropriate coverages. Other coverages are line, point, or annotation coverages and do not require topologic relationships. Chain-node topology present. This data set includes coverages that contain information about geologic units, sample locations, structural features, structural measurements, dikes, selected mines, glacial limits, and materials units. Location data were determined visually using topographic maps at scales of 1:63,360 and 1:40,000 scale topographic maps using USGS map bases. Some stations were plotted on 1:63,360 scale Infra-Red and 1:40,000 scale black and white air photos during mapping. Because location information was acquired during the time period 1980-1992, GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps and in some instances, air photos. The lists of samples were visually checked against the lists of analyzed samples returned from the laboratories. 100 The estimated horizontal error of this dataset is +/- 100 meters. Geologic map data have a horizontal positional accuracy dependent on the "on-screen" method of digital cartography. Map error is induced by: (1) the nominal scale of the aerial photographs on which it is based, with an estimated potential error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground; (2) the error produced by suturing and stretching air photos during orthorectification, with measured errors ranging from X-Y meters; (3) the digitizing RMS error, which varies with digitizing session from X-Y meters; and (4) the accuracy of the human operator digitizing the geologic linework from the topographic base maps and orthophoto, with an estimated error due to a pen line width of approximately 0.001 being equivalent to approximately 1.5 meters on the ground. Thommen TM altimeters were frequently used and calibrated daily. 6 The estimated horizontal error of this dataset is +/- 6 meters, based upon the inherent instrument errors of the Thommen TM altimeter. Kline, J.T. Pinney, D.S. 19970620 map Report of Investigations RI 97-14B Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 1 sheet, scale 1:125,000 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2550 125000 paper map 19800701 19970630 Published in 1997 based on a compilation of work done in the area from a period of 1981 to 1997 Kline and Pinney, 1997 See references cited in reports in RI 1997-14A and RI 1997-14B Fernald, A.T. 1960 map U.S. Geological Survey Bulletin 1071-G B 1071-G Washington, D.C. United States Government Printing Office p. 191-279, 2 sheets, scale 1:250,000 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=3608 250000 paper map and report 1960 Publication date Fernald, 1960 The geologic map synthesis has benefited from regional surficial geologic investigations provided in this bulletin. Kline, J.T. Bundtzen, T.K. 1986 map Anchorage, AK, USA Geological Society of Alaska p. 123-150 T.D. Hamilton, eds. K.M. Reed, eds. R.M. Thorson, eds. 1986 map Anchorage, AK, USA Geological Society of Alaska book 1960 Publication date Kline and Bundtzen, 1986 The geologic map synthesis has benefited from regional surficial geologic investigations provided in this publication. Reed, B.L. Lanphere, M.A. 1972 map U.S. Geological Survey Miscellaneous Field Studies Map 372 MF-372 Washington, D.C. United States Government Printing Office 2 sheets, scale 1:1,000,000 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=13162 1000000 paper map 1972 Publication date Reed and Lanphere, 1972 The geologic map synthesis has benefited from regional geologic mapping provided in this publication. Reed, B.L. Nelson, S.W. 1980 map U.S. Geological Survey Miscellaneous Investigations Map I-1174 I-1174 Washington, D.C. United States Government Printing Office 1 sheet, scale 1:250,000 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=12942 250000 paper map 1980 Publication date Reed and Nelson, 1980 The geologic map synthesis has benefited from regional geologic mapping provided in this publication. Herreid, G.H. 1968 map Geologic Report GR 26 Fairbanks, AK, USA State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 24 p., 2 sheets, scale 1:72,411 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=355 72411 paper map 1968 Publication date Herreid, 1968 The geologic map synthesis has benefited from detailed mapping in the Windy Fork area provided in this publication. Michael Churkin, Jr. Claire Carter 1996 map U.S. Geological Survey Professional Paper 1555 P 1555 Washington, D.C. United States Government Printing Office 84 p., 4 sheets, scale 1:24,000 http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=4018 24000 paper map and report 1996 Publication date Churkin and Carter, 1996 The geologic map synthesis has benefited from detailed mapping in the Terra Cotta Mountains provided in this publication. The coverages included in this project are digitized from a mylar compilation of geologic field maps produced on USGS topo bases of the area. Map unit (polygon) locations and attributes were checked by three reviewers familiar with the dominant geologic rock types and structures and/or the specific geology of the McGrath quadrangle area. Location data were determined visually using topographic maps at scales of 1:63,360 and 1:40,000 scale topographic maps using USGS map bases. Some stations were plotted on 1:63,360 scale Infra-Red and 1:40,000 scale black and white air photos during mapping. Because location information was acquired during the time period 1980-1992, GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps and in some instances, air photos. 1997 Universal Transverse Mercator 5N 0.999600 -153.000 0.0 500000 0 coordinate pair 0.000001 0.000001 meters mcggeog_arc Universal Transverse Mercator 5N 0.999600 -153.000 0.0 500000 0 coordinate pair 0.000001 0.000001 meters mcggeog_poly Universal Transverse Mercator 5N 0.999600 -153.000 0.0 500000 0 coordinate pair 0.000001 0.000001 meters mcgflt_arc Universal Transverse Mercator 5N 0.999600 -153.000 0.0 500000 0 coordinate pair 0.000001 0.000001 meters mcgglacial_arc Universal Transverse Mercator 5N 0.999600 -153.000 0.0 500000 0 coordinate pair 0.000001 0.000001 meters mcgcline_arc Universal Transverse Mercator 5N 0.999600 -153.000 0.0 500000 0 coordinate pair 0.000001 0.000001 meters mcgdike_arc Universal Transverse Mercator 5N 0.999600 -153.000 0.0 500000 0 coordinate pair 0.000001 0.000001 meters mcgstrdip_point Universal Transverse Mercator 5N 0.999600 -153.000 0.0 500000 0 coordinate pair 0.000001 0.000001 meters mcgstrsym_point Universal Transverse Mercator 5N 0.999600 -153.000 0.0 500000 0 coordinate pair 0.000001 0.000001 meters mcgmine_point D_Clarke_1866 Clarke 1866 6378206.4 294.978698 mcggeog_arc.shp Object type is vector, there are 10,322 rows associated with this entity, and the entity values refer to geologic map unit contacts. Alaska Division of Geological & Geophysical Surveys mcggeog_arc CODE Line symbol for geologic map unit contacts Alaska Division of Geological & Geophysical Surveys 5 Contact Alaska Division of Geological & Geophysical Surveys MERGECODE Used to notate contacts that are faults. Alaska Division of Geological & Geophysical Surveys C Contact only Alaska Division of Geological & Geophysical Surveys F Contact/fault Alaska Division of Geological & Geophysical Surveys mcggeog_poly.shp Object type is vector, there are 3221 rows associated with this entity, and the entity values refer to the unit name abbreviations for each specific polygon represented on the map. Alaska Division of Geological & Geophysical Surveys mcggeog_poly UNIT A unique three to four letter abbreviation given to each map unit represented on the map. Any unit ending with a "?" indicates uncertainty. Alaska Division of Geological and Geophysical Surveys RI1997-14_codeset.pdf Alaska Division of Geological & Geophysical Surveys http://www.dggs.dnr.state.ak.us/metadata/RI1997-14_codeset.pdf MAT A unique three letter abbreviation given to each materials unit represented on the map. Materials units imply a hazards classification. Alaska Division of Geological and Geophysical Surveys RI1997-14_codeset.pdf Alaska Division of Geological & Geophysical Surveys http://www.dggs.dnr.state.ak.us/metadata/RI1997-14_codeset.pdf mcgflt_arc.shp Object type is vector, there are 750 rows associated with this entity, and the entity values refer to fault location traces and types. Alaska Division of Geological & Geophysical Surveys mcgflt_arc CODE Types of faults found in the map area. Alaska Division of Geological and Geophysical Surveys 11 high-angle fault Alaska Division of Geological & Geophysical Surveys 12 Approximately located fault Alaska Division of Geological & Geophysical Surveys 13 Fault, inferred Alaska Division of Geological & Geophysical Surveys 15 Concealed fault Alaska Division of Geological & Geophysical Surveys 17 Thrust fault, sawteeth on upper plate Alaska Division of Geological & Geophysical Surveys 33 Lineament, used on small-scale tectonic maps Alaska Division of Geological & Geophysical Surveys MERGECODE Used to notate contacts that are faults. Alaska Division of Geological & Geophysical Surveys C Contact only Alaska Division of Geological & Geophysical Surveys F Contact/fault Alaska Division of Geological & Geophysical Surveys mcgglacial_arc.shp Object type is vector, there are 43 rows associated with this entity, and the entity values refer to glacial extents. Alaska Division of Geological & Geophysical Surveys mcgglacial_arc CODE Ice limit advances-Increasing roman numerals depict maximum drift limits and numerical superscripts depict stages sequentially from oldest to youngest. Alaska Division of Geological and Geophysical Surveys 42 Glacial limit I, approximately located, first advance (oldest) Alaska Division of Geological & Geophysical Surveys 44 Glacial limit II, approximately located, second advance Alaska Division of Geological & Geophysical Surveys 46 Glacial limit III, approximately located, third advance Alaska Division of Geological & Geophysical Surveys 48 Glacial limit IV, approximately located, fourth advance Alaska Division of Geological & Geophysical Surveys 50 Glacial limit V, approximately located, fifth advance Alaska Division of Geological & Geophysical Surveys mcgcline_arc.shp Object type is vector, there are 319 rows associated with this entity, and the entity values refer to the anticline and syncline traces of axial planes. This coverage must be viewed with mcgstrsym layer to know what type of anticline or syncline is being represented by the arc. Alaska Division of Geological & Geophysical Surveys mcgcline_arc CODE A number representing the anticline or syncline trace. Alaska Division of Geological and Geophysical Surveys 34 Fold axis anticline or syncline. Alaska Division of Geological & Geophysical Surveys 38 Anticline or syncline, concealed. Alaska Division of Geological & Geophysical Surveys mcgdike_arc.shp Object type is vector, there are 375 rows associated with this entity, and the entity values refer to dike locations and probable lengths. Alaska Division of Geological & Geophysical Surveys mcgdike_arc CODE One of four numbers that represent dikes found in this map area. Alaska Division of Geological and Geophysical Surveys 54 Dikes Alaska Division of Geological & Geophysical Surveys 55 Dikes Alaska Division of Geological & Geophysical Surveys 56 Dikes Alaska Division of Geological & Geophysical Surveys 57 Dikes Alaska Division of Geological & Geophysical Surveys mcgstrdip_point.shp Object type is point, there are 656 rows associated with this entity, and the entity values refer to symbols for strike and dip information. Alaska Division of Geological & Geophysical Surveys mcgstrdip_point DIP Represents the dip angles used to produce the dip directions. Alaska Division of Geological and Geophysical Surveys 0 90 CODE Represents the symbols used to describe the strike and dips of beds, cleavage, joints, and foliation. Alaska Division of Geological and Geophysical Surveys 1 Strike and direction of dip of beds. Alaska Division of Geological & Geophysical Surveys 4 Strike and dip of overturned beds. Alaska Division of Geological & Geophysical Surveys 5 Strike of vertical beds, stratigraphic tops to north. Alaska Division of Geological & Geophysical Surveys X-COORD Represents the X-coordinates in UTM for each strike and dip location. Alaska Division of Geological and Geophysical Surveys 422695.41 499879.98 meters Y-COORD Represents the Y-coordinates in UTM for each strike and dip location. Alaska Division of Geological and Geophysical Surveys 6874551.19 6952135.66 meters mcgstrsym_point.shp Object type is point, there are 202 rows associated with this entity, and the entity values refer to symbols for folds, anticlines, synclines, and bedding features. This coverage must be viewed with mcgcline layer to know the trace of the anticline or syncline. Alaska Division of Geological & Geophysical Surveys mcgstrsym_point SYMBOL Used for differentiating structural symbol types. Alaska Division of Geological and Geophysical Surveys 22 Anticline and trace of axial plane. Alaska Division of Geological & Geophysical Surveys 23 Syncline and trace of axial plane. Alaska Division of Geological & Geophysical Surveys 24 Relative horizontal movement along fault Alaska Division of Geological & Geophysical Surveys 25 Relative horizontal movement along fault Alaska Division of Geological & Geophysical Surveys 26 overturned syncline, showing direction of dip of limbs Alaska Division of Geological & Geophysical Surveys 27 Overturned anticline, showing direction of dip of limbs Alaska Division of Geological & Geophysical Surveys 39 Provides direction of plunge. Alaska Division of Geological & Geophysical Surveys mcgmine_point.shp Object type is point, there are 38 rows associated with this entity, and the entity values refer to symbols for selected metallic mineral deposits and energy resources. Alaska Division of Geological & Geophysical Surveys mcgmine_point SYMBOL This attribute represents the location of selected mineral deposits and energy resources. Alaska Division of Geological and Geophysical Surveys 143 Specific symbol to designate sample locality. Alaska Division of Geological & Geophysical Surveys ESRI Markerset Mineral.mrk MINE Each number represents the sample location number of the selected mineral deposits and energy resources portrayed in Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska (Sheet 1). Alaska Division of Geological and Geophysical Surveys These values represent the actual locality numbers given to each selected mineral deposits and energy resources. They coincide with Table 1 ("Name of Deposit") of the report Geologic Map of the Eastern Half of the McGrath Quadrangle, Alaska. State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Natural Resource Technician mailing and physical

3354 College Road

Fairbanks AK 99709-3707 USA 907-451-5020 None available. 907-451-5050 dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays Please view our web site (http://www.dggs.dnr.state.ak.us) for the latest information on available data. Please contact us using the e-mail address provided above when possible. Report of Investigation 97-14A The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services 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, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product. Current publication is available on paper. 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. Printed publication can be purchased for $17.00 (contact information below) plus shipping if mailed. PDF 1.6 No compression applied http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2549 ArcGIS Shapefile ESRI ArcGIS 9.x No compression applied http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=2549 CD-ROM Joliet Digital files on CD-ROM are available for $10.00 (contact information below). No fees charged for downloaded files. Order by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). The DGGS web site (http://www.dggs.dnr.state.ak.us/) has a list of electronic data available and an order form that can be printed. Payment accepted: Cash, check, money order, VISA, or MasterCard. Digital downloads: less than 30 minutes for most files. Offline CD/DVD-ROMs: 1-2 weeks unless special arrangements are made and an express fee is paid. Please check the MapInfo web site (http://www.mapinfo.com/) for the latest documentation on importing ESRI shape files. 20080506 20080506 20100506 State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Metadata Manager mailing and physical address

3354 College Road

Fairbanks AK 99709-3707 USA 907-451-5039 907-451-5050 dggspubs@alaska.gov 8 am to 4:30 pm, Monday through Friday, except State holidays. Please contact us through the e-mail address above whenever possible. FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 none 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 State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.