New Jersey Geological Survey DGS99-3 Surficial Geology of Hunterdon County, New Jersey METADATA 1. IDENTIFICATION INFORMATION 1.1. CITATION Surficial Geology of Hunterdon County, New Jersey By Scott D. Stanford and Ron W. Witte Digital Compilation by Scott D. Stanford and Maryann C. Scott, 1999 New Jersey Geological Survey Digital Geodata Series DGS99-3 1.2. DESCRIPTION 1.2.1. ABSTRACT DGS99-3 is an ARC/INFO Geographic Information Systems (GIS) coverage of surficial geologic materials of Hunterdon County, New Jersey. Surficial materials are the unconsolidated sediments that overlie bedrock formations, and that are the parent material for agronomic soils. In Hunterdon County they include stream, wetland, glacial, windblown, and hillslope sediments and weathered bedrock material. The weathered bedrock material may be as much as 200 feet thick. The other sediments are generally less than 20 feet thick. The surficial materials range from coarse gravel to clay and peat. They affect the movement of ground water from the surface into underlying bedrock aquifers, and are aquifers themselves in places. They also provide foundation support for structures, and supply sand and gravel for construction purposes. 1.2.2 LIST OF DIRECTORIES AND BRIEF DESCRIPTION contacts - ARC/INFO polygon coverage of lithologic unit contacts info - ARC/INFO INFO directory 1.2.3 LIST OF FILES AND BRIEF DESCRIPTION 1.2.3.1 hunsrf24.e00 - ARC/INFO export file of the coverage contacts (ASCII text format) 1.2.3.2 hunsrf.zip (8.63MB) Compressed archive (zip) file of the hunsrf24.eoo export file 1.2.3.3 INFO FILES The coverage extent (BND) represents the map extent of coordinates in the coverage. All BND information for a coverage is stored in the BND file. Tics are the registration or geographic control points for a coverage. All tic information for a coverage is stored in the TIC file. Descriptive data about polygons are stored in a polygon attribute table (PAT). TYPE NAME NO. RECS LENGTH ---------------------------------- DF HUNSRF24.BND 1 32 DF HUNSRF24.TIC 33 20 DF HUNSRF24.PAT 2520 122 1.2.4. LIST OF KEYWORDS sediments, surficial geology, deposits, soil, weathered bedrock, map, GIS, ARC/INFO 1.3. GEOGRAPHIC EXTENT Hunterdon County is located in west-central New Jersey. 1.4. CONTACTS INFORMATION Scott D. Stanford N.J. Dept. Of Environmental Protection Division Of Science, Research & Technology N.J. Geological Survey PO Box 427 Trenton, NJ 08625-0427 phone: (609) 292-2576 fax: (609) 633-1004 email: sstanford@dep.state.nj.us internet: http://www.state.nj.us/dep/njgs/ ********************************************************* 2. DATA QUALITY INFORMATION 2.1. NAME OF DATA hunsrf24 2.1.1. DESCRIPTION OF THE TYPE OF DATA An ARC/INFO (v. 7.1.2) geographic information system (GIS) coverage contains vectors with arc-node topology and related attributes. 2.1.2. DATA SOURCE This coverage is assembled from unpublished 1:24,000 surficial geologic quadrangle maps. These maps are based on fieldwork and airphoto interpretation by Stanford and Witte between 1987 and 1990. Mapping credits include: Bloomsbury, Easton, and Washington (R.W. Witte) Califon, Flemington, Frenchtown, Gladstone, Hackettstown, Hopewell, Lambertville, Lumberville, Pennington,Pittstown, Raritan, Riegelsville, Rocky Hill, and Stockton (S.D. Stanford) High Bridge (Witte and Stanford) 2.1.3. DATA ORGANIZERS Scott D. Stanford and Ron W. Witte. Data mylars were digitized by Maryann Scott. 2.1.4. DATE OF COMPLETION August 1, 1999 2.1.5. DATA AUTOMATION AND ACCURACY The contacts coverage was built by scanning mylar separates of the quadrangle maps using a CalComp ScanPlus II scanner set at 400 dpi resolution. The scanner accuracy is +/-.25 percent. The images were saved in a TIFF 5.0 image format. Each image was georegistered to the NAD83 N.J. State Plane Coordinate system. The images were then converted into ARC/INFO GRID's using the IMAGEGRID command. The GRID's were center-line traced and saved as vector coverages using the ARC/INFO GRID GRIDLINE command. Each line coverage was generated, edited, and built into polygon coverages. Proof plots were made of each coverage on mylar and compared to the original base maps. Any line that deviated from the original position by more than .012 inches (about 1 to 1.5 line widths) were redigitized, replotted, and corrected until the desired results were obtained. A CalComp 9100 digitizer was used for editing. It has a documented accuracy of +/- 0.005 inches (+/- 0.127 mm). Polygon and line coverage items were then added to the coverages and manually updated. 2.2.1 TYPE OF SPATIAL DATA An ARC/INFO (v.7.0.3) GIS coverage contains vectors with arc-node topology and related attributes 2.2.2 DATA SOURCE The county outline was copied from the county coverages available at the N.J. Department of Environmental Protection, Office of Information Resource Management, 401 East State Street, Trenton, NJ. All data are reported to conform to National Map Accuracy Standards for the 1:24,000 scale. Please refer to metadata files for /data/legalreg/county/mid and /data/mapgrids/spctiles for more information on data origin, quality, and limitations of the digital-base-map information. ********************************************************* 3. SPATIAL DATA ORGANIZATION INFORMATION 3.1 NAME OF DATA hunsrf24 3.1.1 DATA STRUCTURE Vector data with arc-node topology. Spatial objects include polygons, arcs, labels, tics, and nodes with x, y coordinates. 3.2. NUMBER OF SPATIAL OBJECTS 15423 arcs, 4121 polygons, 11952 nodes, 33 tics, 1015842 arc segments, and 4120 polygon labels. ********************************************************* 4. SPATIAL REFERENCE INFORMATION 4.1. DATA PARAMETERS Scale = 1:24,000 Datum = NAD83 Coordinate System = NJ State Plane Units = feet Projection = Polyconic Zone = 4701 4.2. MAPEXTENT xmin = 298926.906 ymin = 548834.250 xmax = 435640.719 ymax = 712784.562 ********************************************************* 5. ENTITY AND ATTRIBUTE INFORMATION 5.1. NAME OF DIGITAL DATA: hunsrf24 5.1.1. ITEMS AND ATTRIBUTES (polygons and tics only) 5.1.1.2. POLYGONS (HUNSRF24.PAT) COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC 1 AREA 4 12 F 3 9 PERIMETER 4 12 F 3 17 CONTACTS# 4 5 B 21 CONTACTS-ID 4 5 B 25 GEONUM 5 6 I 30 GEOABB 8 9 C 38 GEONAME 80 81 C 118 SYMBOL 5 6 I note: AREA, PERIMETER, HUNSRF24#, and HUNSRF24-ID are default system variables. GEONUM, GEOABB, GEONAME, and SYMBOL are user-specified variables that conform with the N.J. Geological Survey reference file (geolabel.txt) for labeling geologic units. The following list describes the values of the user-specified variables: GEONUM GEOABB GEONAME SYMBOL 170 Qal Alluvium 80 172 Qalb Alluvium and Boulder Lag 70 180 Qcal Alluvium and Colluvium 93 200 Qaf Alluvial Fan Deposits 105 210 Qst Stream Terrace Deposits 85 221 Qtl Lower Terrace Deposits 113 223 Qtu Upper Terrace Deposits 109 160 Qs Swamp and Marsh Deposits 50 230 Qe Eolian Deposits 95 440 Qsdwf Glaciofluvial Deposits 104 480 Qsdif Glaciofluvial Deposits 112 540 Qsdjf Glaciofluvial Deposits 120 520 Qsdjd Glaciolacustrine Deposits 55 370 Qtj Till 117 1100 Tp Pensauken Formation 96 820 Qcb Basalt Colluvium 63 830 Qcd Diabase Colluvium 128 810 Qcg Gneiss Colluvium 98 845 Qccb Carbonate-Rock Colluvium 32 850 Qcc Conglomerate Colluvium 128 840 Qcs Shale, Mudstone, and Sandstone Colluvium 92 940 Qws Weathered Shale, Mudstone, and Sandstone 12 920 Qwb Weathered Basalt 88 930 Qwd Weathered Diabase 129 910 Qwg Weathered Gneiss 8 960 Qwcb Weathered Carbonate Rock 94 950 Qwc Weathered Conglomerate 23 50 ebo Extensive Bedrock Outcrop 14 75 sbo Scattered Bedrock Outcrop 97 A brief description of the map units follows. ALLUVIUM (Holocene and late Pleistocene) - Sand, gravel, silt, clay, organic matter. Deposited in modern floodplains and channels. As much as 20 feet thick. ALLUVIUM AND BOULDER LAG (Holocene and late Pleistocene) - Sand, silt, clay, and organic matter interspersed with lag concentrations of diabase boulders. As much as 10 feet thick. ALLUVIUM AND COLLUVIUM (Holocene and late Pleistocene) - Interbedded alluvium and colluvium in headwater areas of valleys. As much as 20 feet thick. ALLUVIAL FAN DEPOSITS (Pleistocene) - Gravel, sand, silt. As much as 40 feet thick. STREAM TERRACE DEPOSITS (Holocene and late Pleistocene) - Sand, silt, gravel. As much as 30 feet thick. LOWER TERRACE DEPOSITS (late Pleistocene) - Sand, gravel, silt. As much as 20 feet thick. UPPER TERRACE DEPOSITS (middle to late Pleistocene) - Sand, silt, clay, gravel. As much as 30 feet thick. SWAMP AND MARSH DEPOSITS (late Pleistocene and Holocene) - Peat and organic clay and silt. As much as 10 feet thick. EOLIAN DEPOSITS (Pleistocene) - Windblown fine sand and silt. As much as 10 feet thick, generally less than 3 feet thick. GLACIOFLUVIAL DEPOSITS (late Pleistocene) - Sand and gravel. As much as 40 feet thick. Deposited during the late Wisconsinan glaciation about 20,000 years ago. GLACIOFLUVIAL DEPOSITS (middle Pleistocene) - Sand and gravel. As much as 20 feet thick. Deposited during the Illinoian glaciation about 150,000 years ago. GLACIOFLUVIAL DEPOSITS (late Pliocene-early Pleistocene) - Sand, gravel, clay. As much as 15 feet thick. Deposited during a pre-Illinoian glaciation between 2 million and 800,000 years ago. GLACIOLACUSTRINE DEPOSITS (late Pliocene-early Pleistocene) - Sand, gravel, minor silt and clay. As much as 30 feet thick. Deposited during a pre-Illinoian glaciation. TILL (late Pliocene-early Pleistocene) - Cobbles, pebbles, and a few boulders in sandy clay. As much as 30 feet thick. Deposited during a pre-Illinoian glaciation. PENSAUKEN FORMATION (Pliocene) - Gravel in clayey sand to sandy clay. As much as 15 feet thick. BASALT COLLUVIUM (Pleistocene) - Clayey silt with basalt fragments. As much as 20 feet thick. DIABASE COLLUVIUM (Pleistocene) - Clayey sandy silt with diabase fragments. As much as 40 feet thick. GNEISS COLLUVIUM (Pleistocene) - Sandy silt to silty sand with gneiss fragments. As much as 50 feet thick. CARBONATE-ROCK COLLUVIUM (Pleistocene) - Clayey silt with carbonate-rock fragments. As much as 20 feet thick. CONGLOMERATE COLLUVIUM (Pleistocene) - Clayey sandy silt with pebbles and cobbles of quartzite and chert. As much as 20 feet thick. SHALE, MUDSTONE, AND SANDSTONE COLLUVIUM (Pleistocene) - Sandy silt to clayey silt with shale, mudstone, or sandstone fragments. As much as 30 feet thick. WEATHERED SHALE, MUDSTONE, AND SANDSTONE (Pleistocene) - Silty sand to silty clay with shale, mudstone, or sandstone fragments. As much as 10 feet thick on shale and mudstone, 30 feet thick on sandstone. WEATHERED BASALT (Pleistocene) - Clayey silt with basalt fragments. As much as 10 feet thick. WEATHERED DIABASE (Pleistocene) - Clayey sand to silty clay with diabase fragments and boulders. As much as 15 feet thick. WEATHERED GNEISS (Pleistocene) - Clayey sand to sandy clay with gneiss fragments. As much as 200 feet thick. WEATHERED CARBONATE ROCK (Pleistocene) - Silty clay with quartz, chert, and carbonate-rock fragments. As much as 100 feet thick. WEATHERED CONGLOMERATE (Pleistocene) - Clayey sand to silty clay with pebbles and cobbles of quartzite and chert. As much as 150 feet thick. EXTENSIVE BEDROCK OUTCROP - Surficial material generally absent. SCATTERED BEDROCK OUTCROP - Surficial material thin and patchy. 5.1.1.3. TICS (HUNSR24.TIC) COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC 1 IDTIC 4 5 B - 5 XTIC 4 12 F 3 9 YTIC 4 12 F 3 note: All items are system default variables. ********************************************************* 6. DISTRIBUTION INFORMATION Data are available upon written request from the New Jersey State Geologist or by download through the New Jersey Geological Survey web page http://www.state.nj.us/dep/njgs). Haig Kasabach, State Geologist New Jersey Geological Survey Box 427 29 Arctic Parkway Trenton, NJ 08625 ********************************************************* 7. METADATA REFERENCE INFORMATION 7.1. PUBLICATION DATE: 8-1-99 7.2. AUTHOR: Scott D. Stanford, Ronald S. Pristas, and Maryann Scott ********************************************************* 9. AUTHORS NOTES Enlargement of the data to more detailed scales than specified could result in registration errors. If information is needed at more detailed scales, please contact the N.J. Geological Survey to determine the status of detailed mapping.