i2542_readme.txt Blake, Jr., M.C., Harwood, D.S., Helley, E.J., Irwin, W.P., Jayko, A.S. and Jones, D.L., 1999, Geologic map of the Red Bluff 30' x 60' quadrangle, California: U.S. Geological Survey Investigations Map I-2542, 1 sheet, scale 1:100,000, pamphlet 15 p., and database, available at http://pubs.usgs.gov/imap/2542/. This geologic map and database of the Red Bluff 30' x 60' quadrangle in northwestern California includes rocks of four major geologic provinces: the Klamath Mountains, the Coast Ranges, the Great Valley, and the Cascade Range (see fig. 1 on map sheet).These rocks and their geologic histories differ greatly from one another. The stratigraphic and structural relations shown on the Red Bluff map provide a key to understanding how the rocks of these various provinces were formed and were subsequently assembled. The Klamath Mountains are mainly an accumulation of large tectonic slices of oceanic crust, upper mantle, and volcanic island arcs that range in age from early Paleozoic to Late Jurassic. The rocks of the Coast Ranges that are present in the Red Bluff quadrangle consist of oceanic crustal rocks that are somewhat similar lithologically to those of the Klamath Mountains but are Early Jurassic to Cretaceous in age. The Great Valley province includes a thick deposit of moderately deformed Jurassic and Cretaceous marine strata that consist of detrital materials derived from uplifted basement rocks of the Klamath Mountains and the Sierra Nevada. In the western foothills of the Sacramento Valley, these strata rest partly on the Coast Range ophiolite and partly on the Klamath Mountains basement rocks and, thus, pose a complex tectonic question. In the central part of the Sacramento Valley, a mantle of Tertiary and Quaternary detrital continental deposits overlies the Great Valley sequence; these deposits, which are derived from the west, grade eastward into coeval volcanic materials derived from the Cascade Range province. For the compilation of this geologic map, Irwin is responsible for the rocks of the Klamath Mountains province; Blake, Jayko, and Jones, the pre-Cenozoic rocks of the Coast Ranges province; Helley, the late Cenozoic deposits of the Sacramento Valley; and Harwood, the Cenozoic rocks of the Cascade Range province. Previously published geologic mapping used in this compilation is summarized in figure 2 (on map sheet). Map projection for coverages: Projection UTM Zone 10 Zunits NO Datum NAD27 Spheroid Clarke1866 Xshift 0.00000000000 Yshift 0.00000000000 Parameters ================================================================ The report consists of the following parts: 1. i2542_readme.txt - This README ================================================================ 2. i2542_metadata.txt - FGDC-compliant metadata documenting the GIS layers ================================================================ 3. i2542_database.zip i2542_e00_files(folder) - Package of exported ArcInfo coverages and associated files used to produce the printed geologic map: i2542_anno.e00 - ArcInfo Export file of the annotation layer. Contains geologic unit labels and geologic feature annotation, and leaders (arcs, polygons, and annotation). i2542_con.e00 - ArcInfo Export file of the topographic base contour layer (arcs). Does not contain tagged attributes. i2542_cult.e00 - ArcInfo Export file of the topographic base culture layer, (arcs). Does not contain tagged attributes. i2542_drn.e00 - ArcInfo Export file of the topographic base drainage layer (arcs). Does not contain tagged attributes. i2542_geo.e00 - ArcInfo Export file of the geologic layer. Contains contacts, faults, and unit polygons (arcs and polygons). i2542_lds.e00 - ArcInfo Export file of the landslide arrows (arcs). Does not contain tagged attributes. i2542_stg.e00 - ArcInfo Export file of the geologic stage layer. Contains stage axes and stage names (arcs and annotation). i2542_str.e00 - ArcInfo Export file of the geologic structure layer. Contains fold axes, fold arrows, oriented structural points and dip numbers (arcs, points, and annotation). ---------------------------------------------------------------- ArcInfo INFO lookup tables used to produce a plot of the map: redgeo_line.lut.e00 - ArcInfo Export file of lookup table for line features redgeo_poly.lut.e00 - ArcInfo Export file lookup table for polygon features rsdstr_allmark.lut.e00 - ArcInfo Export file lookup table for point features redgeo_patterns.lut.e00 - ArcInfo Export file lookup table for polygon features ---------------------------------------------------------------- ArcInfo symbolsets used to produce a plot of the map: redbluff.mrk.e00 - ArcInfo Export file of the markerset used to symbolize the point symbols redbluff.lin.e00 - ArcInfo Export file of the lineset used to symbolize the lines redbluffpatterns.shd.e00 - ArcInfo Export file of the shadeset used to symbolize the geologic unit polygons with lithologic patterns. wpgcmyk.shd.e00 - ArcInfo Export file of the shadeset used to symbolize the geologic unit polygons. geofontrb.txt.e00 - ArcInfo Export file of the textset used to symbolize the geologic unit labels. ---------------------------------------------------------------- Fonts used in ArcInfo symbolsets: fnt035.e00 - Font used in symbolset fnt038.e00 - Font used in symbolset ---------------------------------------------------------------- i2542_map.aml.e00 - ArcInfor Arc Macro Languages (AML) file used to produce a plot of the map ---------------------------------------------------------------- i2542_map.gra - ArcInfo graphics file produced by running i2542_map.aml ================================================================ 4. Stratagem_v1pt5.zip - Fonts needed to represent geologic unit labels in ArcGIS. Contains instructions for loading font. ================================================================