To all users: The digital product Surficial Geologic Map of the Salem Depot-Newburyport East-Wilmington-Rockport 16-quadrangle area in Northeast Massachusetts consists of: explanatory text (ofr2006-1260B_text.pdf), a 1:50,000 scale map (ofr2006-1260B_50.pdf), fifteen 1:24,000 scale maps (pdf format, also referred to as the browse graphics), 4 ArcGIS (ESRI) format shapefiles with metadata (in .xml, .htlm, and .txt formats), and scanned, georeferenced topographic base maps. OFR2006-1260B_50.pdf - SURFICIAL GEOLOGIC MAP OF THE SALEM DEPOT-NEWBURYPORT EAST-WILMINGTON-ROCKPORT 16-QUADRANGLE AREA IN NORTHEAST MASSACHUSETTS: This map shows the postglacial deposits, stratified deposits, till and bedrock of the 16-quadrangle area on a shaded relief base map at 1:50,000 scale. This map, which contains abbreviated text and unit descriptions, is designed to be printed on 54" x 36" paper (landscape orientation). This graphic contains base map data layers for hydrography arcs and polygons (1:100,000 scale, hdhk#), major roads (Executive Office of Transportation), shaded relief base (1:5,000 scale), annotation (hydro and places), town boundaries, USGS quadrangle grid (used to delineate quad bounds and also to mask out areas beyond the 16 quad area). If you wish to re-create the look of this base map, this data can be downloaded from MassGIS (http://www.mass.gov/mgis/download.htm). OFR2006-1260B_text.pdf - This is the explanatory pamphlet (map text) which should accompany all geologic maps and data layers in this report. The GIS folder contains 3 subdirectories: shapes, metadata, and 24_basemaps: The shapes folder contains ArcGIS data layers in shapefile format: Till_bedrock - which contains 5 types of polygons: thin till, thick till, end moraine deposits, bedrock outcrops, and areas of abundant outcrop/shallow bedrock. Thin till and bedrock outcrops polygons are mutually exclusive; thick till and end moraine polygons overlie areas of thin till; and abundant outcrop/shallow bedrock polygons overlie areas of thin till and bedrock outcrops. Stratified_deposits - which contains polygons representing coarse and fine glacial stratified deposits. Fine glacial stratified deposits are differeniated between glaciolacustrine and glaciomarine. Early_postglacial - which contains polygons representing marine regressive deposits. Postglacial - which contains polygons for swamp deposits, salt-marsh deposits, floodplain alluvium, beach and dune deposits, and artificial fill. Swamp, salt-marsh, and alluvium polygons are mutually exclusive; artificial fill and beach/dune polygons may overlie areas of swamp, salt-marsh, or alluvium. Each shapefile has the following file component extensions: .dbf, .lyr, .prj, .sbn, .shp, and .shx. Each shapefile contains FGDC compliant metadata in xml format (which can be read in various styles using Arc Catalog). Note that all shapefiles and data layers on this DVD are in Massachusetts State Plane Coordinates NAD 83 (meters). All shapefiles used to create the geologic maps (browse graphics) have associated layer (.lyr) files. If you wish to use these to re-create our color scheme you can by opening the surficial_geology.mxd (located in the ‘shapes’ folder) with ArcMap; this map document uses relative path names so as long as the directory structure for the data remains the same (\GIS\shapes\) the layers should load correctly. If you move the data, you can add these layer files in ArcMap, then 'right click' on the layer file, choose properties, then choose the tab for source, and click the button for 'set data source' and choose the current location of the shapefile then click add. Note that the layers should be used in this order, from top to bottom: shallow_bedrock.lyr (transparent pattern), postglacial.lyr, early_postglacial.lyr, stratified_deposits.lyr, and till_bedrock.lyr. Note that till_bedrock and stratified_deposit data polygons along the immediate coast have been extended off shore a short distance in an attempt to account for use with various shorline datasets (different scales or different time frame). Postglacial deposit polygons along the immediate coast have either been extened in the same manor or have been mapped with a shoreline that was vectorized (along with the data) from the 1:24,000 topographic quadrangles. The metadata folder contains text and html versions of FGDC compliant metadata for each shapefile. The 24k_basemaps folder contains georeferenced tiff images for each quad (except Hampton) - these are the older series topographic quadrangles (1:24,000 scale) which have the same contour base (10 foot contour interval) as the original geologic mapping. Each quadrangle will have the following file component extensions: .aux, .tif, .tfw, and .tif.lyr. Paper quadrangle maps were scanned and georeferenced by the Office of the Massachusetts State Geologist for this particular project. Some quads were re_georeferenced by USGS personnel to better fit the vectorized published geologic quads (georeferenced by MASSGIS). These images carry no warranty or metadata: they may not be useful for any other project or purpose. Each of these images has an associated layer file which attempts to colormap the image so that the white background, the green of forest areas, and the pink of urban areas all become transparent. These topo images are part of the surficial_geology.mxd - they are used as base maps and are placed on top of the geologic data layers. Surficial_geology.mxd uses relative path names so as long as the directory structure for the images remains the same (\GIS\24k_basemaps\) they should load correctly. If you move the data, you can add these layer files in ArcMap, then 'right click' on the layer file, choose properties, then choose the tab for source, and click the button for 'set data source' and choose the current location of the shapefile then click add. The 24K_GRAPHICS folder contains the browse graphics in .pdf format: Quadrangle_name.pdf - These maps show the postglacial deposits, stratified deposits, till and bedrock of the individual quadrangle (for the fourteen quadrangles that are primarliy in Massachusetts) on a scanned topographic base at 1:24,000 scale. The Exeter and Hampton quadrangles are shown together; note that only Exeter is shown on a scanned topographic base and only a very small area of the Hampton quad is shown. These graphics are provided to demonstrate the geologic contacts at the appropriate data scale of 1:24,000; they do not contain explanatory text or unit descriptions. These maps can be printed on 20" x 28" paper (portrait orientation); they should be accompanied by the explanatory pamphlet OFR2006-1260B_text.pdf. Users can create similar maps by opening the surficial_geology.mxd with ArcMap, or by using the layer files in the shapes and 24k_basemaps folders. Note that geology is only mapped in the Massachusetts portions of all the border quadrangles. Contact information. If you have questions regarding the data provided on this DVD please contract: Janet Stone (jrstone@usgs.gov) or Mary DiGiacomo-Cohen (mdicohen@usgs.gov) (860) 405-9210 U.S.G.S. UCONN Avery Point 1080 Shennecossett Rd Groton, CT 06340