NEVADA BUREAU OF MINES AND GEOLOGY COUNTY DIGITAL GEOLOGIC MAPPING PROJECT 1996 NBMG_CD2 Principal Investigators Ronald H. Hess, Geographic Information System Supervisor Gary L. Johnson, Geographic Information System Processor Nevada Bureau of Mines and Geology Mackay School of Mines University of Nevada, Reno M.S. 178 Reno, Nevada 89557-0088 (702) 784-6691 Project Funding Provided by: United States Department of Energy Yucca Mountain Office For further information contact Ron Hess at (702) 784-6691 or by email at rhess@nbmg.unr.edu. The purpose of this project was to create quality state-wide county digital geologic maps from existing 1:250,000-scale maps in county geologic and mineral resource bulletins published by the Nevada Bureau of Mines and Geology (NBMG). LAYERS OF DATA DIGITIZED 1) bedrock geologic coverage from 1:250,000-scale county geologic maps 2) fault coverage from 1:250,000-scale county geologic maps The geologic/fault maps from NBMG geologic and mineral resource bulletins are provided by individual county as two coverages (geologic polygon coverage and fault line coverage). Exceptions to this are Nye and Washoe Counties. They were published in two sections with Storey County as part of the southern Washoe County map. Lyon, Douglas, and Ormsby (Carson City) Counties were published as one report and are provided as a single coverage. The Clark County geologic map was converted to a digital format under an earlier contract and is not part of this project. However, it is included in the same export file format in UTM zone 11 projection. The county map coverages listed above are provided as digital files in ARC/INFO Version 6.1.1 export file format. Digital files are in UTM zone 11 projection. In the metadata.dbf and metadata.prn files are NBMG metadata forms including bibliographic references of source material. The README.TXT file is a listing of the files contained on this CDROM. Equipment and Software The NBMG Geographic Information Systems (GIS) lab uses workstation based ARC/INFO, TINS, and NETWORK on a SUN SPARC II server, several UNIX work stations and PC ARC/INFO running on three PC DOS compatible microcomputers. The server and workstations operate under SUN OS 4.1.3 and have 12 gigabytes of dedicated disk space, 2.3 gigabyte and 150 megabyte tape drives, and a CD ROM reader. Digitizing is accomplished via two Calcomp 9500 and two Calcomp Drawing Board III series digitizing tablets. Hard copy map plots were produced using an HP-7585B or HP-7550A pen plotter and a Novajet II inkjet plotter. All manual input, data transformations, projections, data analysis, and map compositions were produced using the above listed equipment and software. All digital data coverages were created in single precision. All coverages digitized for this project were checked for accuracy by staff members that have not been involved in the original digitizing process, then edited by a GIS processor and a final check was made to insure accuracy. Line work was completed and edited prior to attributing. Attributing was completed, then checked by a different person, edited, and then subjected to a final check. Attribute File Descriptions Item description of the .pat file format used for county geologic maps. Field "FMATN" contains the geologic map symbol from the published map which represents a combination of the unit age and rock description with the data being between two and five characters in length. Field "L_NAME" is a short description of the rock type but does not include age information. Arc: items county_geology.pat COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 AREA 4 12 F 3 - 5 PERIMETER 4 12 F 3 - 9 MIN_G_UTM# 4 5 B - - 13 MIN_G_UTM-ID 4 5 B - - 17 FMATN 6 6 C - - 23 L_NAME 50 50 C - - Item description of the .aat file format used for county geologic maps. Field "C_CODE" contains the type of geologic contact symbol from the published map. Field "C_TYPE" is a short description of the above listed C_CODE. Below is a list that identifies the codes followed by the items description of the geology .aat file. Attributes for County FAULTS (Arcs) C_CODE 2 2 I 1 = Known contact 2 = Inferred contact 3 = Concealed contact 4 = Queried contact 5 = Other 6 = Fault contact 99 = Boundary C_TYPE 20 20 C Known contact = 1 Inferred contact = 2 Concealed contact = 3 Queried contact = 4 Other = 5 Fault contact = 6 Arc: items county_geology.aat COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - - 5 TNODE# 4 5 B - - 9 LPOLY# 4 5 B - - 13 RPOLY# 4 5 B - - 17 LENGTH 4 12 F 3 - 21 MIN_G_UTM# 4 5 B - - 25 MIN_G_UTM-ID 4 5 B - - 29 C_CODE 2 2 I - - 31 C_TYPE 20 20 C - - Item description of the .aat file format used for county fault maps. Field "F_CODE" contains the type of fault symbol shown on the published map. Field "F_TYPE" is a short description of the above listed F_CODE. Field "F_MOVE" identifies type of movement if shown on the published map. Field "F_DIP" shows dip angle when indicated on published map. Below is a list that identifies the codes used followed by the items description of the county faults .aat file. Attributes for FAULTS (Arcs) F_Code 2 2 I Examples: 1 = Known fault 2 = Inferred fault 3 = Concealed fault 4 = Known queried fault 12 = Inferred queried fault 14 = Concealed queried fault 5 = Known thrust fault 6 = Inferred thrust fault 7 = Concealed thrust fault 8 = Known queried thrust fault 13 = Inferred queried thrust fault 15 = Concealed queried thrust fault 9 = Vein 10 = Dike 16 = Fault scarp 99 = Boundary F_Type 30 30 C Examples: Known fault = 1 Inferred fault = 2 Concealed fault = 3 Known queried fault = 4 Inferred queried fault = 12 Concealed queried fault = 14 Known thrust fault = 5 Inferred thrust fault = 6 Concealed thrust fault = 7 Known queried thrust fault = 8 Inferred queried thrust fault = 13 Concealed queried thrust fault = 15 Vein = 9 Dike = 10 Other = 16 Boundary = 99 F_move 2 2 C D = Down Side R = Right Lateral L = Left Lateral U = Unknown movement F_dip 2 2 I 20 = Angle of Dip 99 = No angle shown F_dip is only used on the Southern Nye County map coverages. The following page is an example of a symbol legend illustrating the symbols used to designate the various types of contacts and faults shown on the hard copy plots that accompany this report. Arc: items county_faults.aat COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED? 1 FNODE# 4 5 B - - 5 TNODE# 4 5 B - - 9 LPOLY# 4 5 B - - 13 RPOLY# 4 5 B - - 17 LENGTH 4 12 F 3 - 21 MIN_F_UTM# 4 5 B - - 25 MIN_F_UTM-ID 4 5 B - - 29 F_CODE 2 2 I - - 31 F_TYPE 30 30 C - - 61 F_MOVE 2 2 C - - 63 F_DIP 2 2 I - - Summary The Nevada Bureau of Mines and Geology, with funding assistance from the U.S. Department of Energy, has created digital versions of 1:250,000-scale county geologic and fault maps statewide. These digital geologic maps can now be used as tools for land use planning, resource management, identifying potential geologic hazards, and geologic/mineral resource analysis. The authors of this report thank the U.S. Department of Energy for the funding assistance that made this project possible. We also thank the diligent and hardworking student digitizing staff that assisted us during this project.