New Jersey Geological Survey DGS97-2 Surficial Geology of Middlesex County, New Jersey METADATA 1.0 IDENTIFICATION INFORMATION 1.1 CITATION Surficial Geology of Middlesex County, New Jersey By S.D. Stanford Digital Compilation by M.C. Scott, and R.S. Pristas, 1996 N.J. Geological Survey Digital Geodata Series DGS97-2 1.2 DESCRIPTION 1.2.1 ABSTRACT This coverage shows the surficial geologic materials of Middlesex County. Surficial materials are the unconsolidated sediments that overlie bedrock or Coastal Plain formations, and that are the parent material for agronomic soils. In Middlesex County, they include stream, wetland, glacial, estuarine, windblown, and hillslope sediments and weathered bedrock material. They are as much as 140 feet thick, but are generally less than 40 feet thick over most of the county. These materials range from coarse gravel to clay and peat. They affect the movement of ground water from the surface into underlying bedrock and Coastal Plain aquifers, and are aquifers themselves in places. They also provide foundation support for structures, and supply sand and gravel for construction projects. This coverage is assembled from published and unpublished 1:24,000 surficial geologic quadrangle maps (listed in section 2.1.2). This coverage shows only the surface extent of the materials. The published maps include well and boring data and cross sections that show the thickness and subsurface distribution of the units. A description of the engineering, hydrogeologic compositional, and mineral resource properties of these materials, and their age and geologic history, is provided by the following report: Stanford, S.D., in review, Environmental Geology of Middlesex County, New Jersey: Surficial Geology: N.J. Geological Survey Open-File Map, scale 1:48,000. 1.2.2 LIST OF DIRECTORIES AND BRIEF DESCRIPTION midsrf24 - ARC/INFO polygon and line coverages of lithologic unit contacts info - ARC/INFO INFO directory 1.2.3 LIST OF FILES AND BRIEF DESCRIPTION midsrf24.e00 - ARC/INFO export file of the coverage contacts (ASCII text format) readme.txt - ASCII text file containing brief description of geologic units 1.2.4 LIST OF KEYWORDS contacts, surficial, sediments, geonum, geoabb 1.3 GEOGRAPHIC EXTENT Middlesex County is located in the eastern-central part of New Jersey. 1.4 CONTACTS INFORMATION Scott Stanford, Maryann Scott, Ronald Pristas N.J. Deptartment of Environmental Protection Division of Science & Research N.J. Geological Survey PO Box 427 Trenton, NJ 08625 Tel: (609) 292-2576, email: sstanford@dep.state.nj.us ********************************************************* 2. DATA QUALITY INFORMATION 2.1 NAME OF DATA midsrf24 2.1.1 DESCRIPTION OF THE TYPE OF DATA ARC/INFO (v.7.03) GIS coverages containing vectors with arc-node topology and related attributes 2.1.2 DATA SOURCE Surficial contacts were scanned and traced from mylar Separates compiled from U.S. Geological Survey 1:24,000-scale, 7-1/2 minute quadrangle base maps. This coverage is based on fieldwork, airphoto interpretation, and compilations of well and boring data acquired between 1988 and 1996, and includes work from the following sources: Stanford, S.D., 1992, Surficial Geology of the Bound Brook Quadrangle, Somerset and Middlesex Counties, New Jersey: N.J. Geological Survey Open-File Map 4. Stanford, S.D., 1993, Surficial Geology of the Princeton Quadrangle, Mercer and Middlesex Counties, New Jersey: N.J. Geological Survey Open-File Map 11. Stanford, S.D., 1995, Surficial Geology of the South Amboy Quadrangle, Middlesex and Monmouth Counties, New Jersey: N.J. Geological Survey Open-File Map 18. Stanford, S.D., Monteverde, D.M., Volkert, R.A., Sugarman, P.J., and Brenner, G.J., in press, Geology of the New Brunswick Quadrangle, Middlesex and Somerset Counties, New Jersey: N.J. Geological Survey Open-File Map. Stanford, S.D., in review, Surficial Geology of the Perth Amboy and Arthur Kill Quadrangles, Middlesex and Union Counties, New Jersey: N.J. Geological Survey Open-File Map. Unpublished quadrangles on file at the N.J. Geological Survey, date of completion or revision in parentheses: Plainfield (1988, revised 1991) Monmouth Junction (1990, revised 1995) Jamesburg (1992) Keyport (1993) Hightstown (1991) Freehold (1992) 2.1.3 DATA ORGANIZERS Scott Stanford, Maryann Scott and Ronald Pristas 2.1.4 DATE OF COMPLETION March 15, 1996 2.1.5 DATA AUTOMATION AND ACCURACY The midsrf24 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 line vectors 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 which has an 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 ARC/INFO (v.7.0.3) GIS coverage containing vectors with arc-node topology and related attributes 2.2.2 DATA SOURCE The county outline was copied from the county coverages available from at the N.J. Department of Environmental Protection, Office of Information Resource Management, 401 East State Street, Trenton, NJ. All data is 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 midsrf24 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 Midgeo contains 1115 polygons, 1114 labels, 6803 arcs, 5913 nodes,1114 annotation, and 44 tics. ********************************************************* 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 = 455731.031 YMIN = 516429.843 XMAX = 574494.750 YMAX = 646813.937 ********************************************************* 5. ENTITY AND ATTRIBUTE INFORMATION 5.1 NAME OF DIGITAL DATA midsrf24 5.1.1 ITEMS AND ATTRIBUTES (polygons, and tics only) 5.1.1.1 POLYGONS (MIDSURF24.PAT) COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC 1 AREA 4 12 F 3 5 PERIMETER 4 12 F 3 9 MIDSRF24# 4 5 B - 13 MIDSRF24-ID 4 5 B - 29 GEONUM 5 6 I - 25 SYMBOL 5 6 I - 17 GEOABB 7 8 C - Note: Area, perimeter, midsrf24#, midsrf24-id are default system variables. Geonum, and geoabb are user-specific variables that conform with the NJGS reference file (/geodata/utility/geolabels) for labeling geologic units. The following list describes the values of the user-specified variables: SYMBOL GEONUM GEOABB DESCRIPTION 14 50 ebo Extensive bedrock outcrop 97 25 sbo Scattered bedrock outcrop 50 160 Qs Swamp and Marsh Deposits 80 170 Qal Alluvium 93 180 Qcal Colluvium and Alluvium 55 190 Qmm Estuarine Deposits 105 200 Qaf Alluvial Fan Deposits 113 221 Qtl Lower Terrace Deposits 109 223 Qtu Upper Terrace Deposits 95 230 Qe Eolian Deposits 83 240 Qbs Beach Sand 73 312 Qtwr Rahway Till 60 420 Qsdwd Glaciolacustrine Sand & Gravel 47 430 Qsdwlb Glaciolacustrine Lake Bottom Deposits 104 440 Qsdwf Glaciofluvial Sand & Gravel 40 600 Qic Ice Contact Deposits 76 710 Qmw Late Wisconsinan Moraines 92 840 Qcs Shale Colluvium 84 870 Qcsg Sand & Gravel Colluvium 99 880 Qcsl Sand & Silt Colluvium 129 930 Qwd Weathered Diabase 12 940 Qws Weathered Shale 82 962 Qwcp Weathered Coastal Plain Formation 96 1100 Tp Pensauken Formation 86 1105 Tpg Pensauken Formation, glauconitic 119 1250 Tg Upland Gravel A brief description of the map units follows. More complete descriptions are provided in the published quadrangle maps and in the report mentioned in section 1.2.1 above. ebo EXTENSIVE BEDROCK OUTCROP, (surficial units generally absent) sbo SCATTERED BEDROCK OUTCROP, (surficial units generally absent) Qal ALLUVIUM Silt, sand, gravel, clay, organic matter (as much as 20 feet thick). Qbs BEACH DEPOSITS Sand and gravel. As much as 15 feet thick. Qmm ESTUARINE DEPOSITS Organic clay and silt, peat, Minor sand and gravel (as much as 100 feet thick). Qs SWAMP AND MARSH DEPOSITS Peat and organic silt, sand, and clay (as much as 10 feet thick). Qe EOLIAN DEPOSITS Fine sand (as much as 20 feet Thick). Qtl LOWER TERRACE DEPOSITS Sand, gravel, minor silt (as much as 40 feet thick. Qtu UPPER TERRACE DEPOSITS Sand, gravel, minor silt (as much as 20 feet thick. Qsdwf GLACIOFLUVIAL SAND AND GRAVEL DEPOSITS Sand and gravel (as much as 100 feet thick). Qsdwd GLACIOLACUSTINE SAND AND GRAVEL DEPOSITS Sand and gravel (as much as 30 feet thick). Qsdwlb GLACIOLACUSTRINE LAKE-BOTTOM DEPOSITS Silt and Clay (as much as 20 feet thick). Qtwr RAHWAY TILL Silty sand to sandy silt with pebbles and cobbles and a few boulders (as much as 60 feet thick). Qmw MORAINE DEPOSITS Till as above forming ridge-and- Swale moraine topography (as much as 130 feet thick). Qic ICE-CONTACT DEPOSITS Sand, gravel, till (as much as 50 feet thick). Qcs SHALE COLLUVIUM Silt, sand, clay, and shale fragments (as much as 10 feet thick). Qcsg SAND AND GRAVEL COLLUVIUM Sand, gravel, minor Silt (as much as 10 feet thick). Qcsl SAND AND SILT COLLUVIUM Sand, silt, clay, minor Gravel (as much as 10 feet thick). Qcal COLLUVIUM AND ALLUVIUM As above, undivided (as much as 10 feet thick. Tp PENSAUKEN FORMATION Sand and gravel (as much as 140 feet thick). Tpg PENSAUKEN FORMATION, GLAUCONITIC PHASE Sand gravel. Sand (as much as 40 feet thick)includes glauconite. Tg UPLAND GRAVEL Sand and gravel (as much as 10 feet thick). Qwd WEATHERED DIABASE Sandy silty clay with diabase Fragments and some gravel (as much as 15 feet thick). May be overlain by thin, patchy colluvium. Qws WEATHERED SHALE, MUDSTONE AND SANDSTONE Silty clay with shale, mudstone, and sandstone fragments and some gravel (as much as 10 feet thick). May be overlain by thin, patchy colluvium. Qwcp WEATHERED COASTAL PLAIN FORMATIONS Outcrop areas of sand, silt, and clay Coastal Plain formations. May be overlain by thin, patchy sand, gravel, and silt colluvium. 5.1.1.3 TICS (MIDSRF24.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 ********************************************************* 5.4 LIST OF RELATED TEXT FILES AND LOOK-UP TABLES /geodata/utility/geolabel contains item variables used by the NJGS for labeling polygons denoting geologic areas. ********************************************************* 6. DISTRIBUTION INFORMATION Data is available upon request in the following formats 8mm, 4mm, or 1/4" data cartridges in tar format from the agency listed below. N.J. Geological Survey PO Box 427 29 Arctic Parkway Trenton, NJ 08625 (609) 292-2576 Each tape is prepared at the time of request. Please contact the names listed in section 1.4 above for more information on how to obtain this data and other available distribution formats. ********************************************************* 7. METADATA REFERENCE INFORMATION 7.1 METADATA AUTHORS Ronald Pristas, MaryAnn Scott, and Scott Stanford ********************************************************* 8. PUBLISHED REFERENCES Refer to section 2.1.2