This data set contains boundaries and tags for major geologic units in the Delawarer River Basin. The data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. The data are generalized from a compilation prepared for use in the Geologic Map of North America, to be published in hard copy by the Geological Society of America and released as a digital file by the U.S. Geological Survey.
This data has been prepared with a degree of detail appropriate for viewing at a scale of 1:7,500,000. Because of the degree of generalization required (generalization based on compilation scale), the data are intended primarily for display and for regional and national analysis, rather than for more detailed analysis in specific areas. No responsibility is assumed by the USDA Forest Service in the use of these data.
>* this file is not 'true' Arc/INFO coverages; it is graphic > representations of symbols and text used on the geologic map. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, some Arc/INFO-specific terminology is included for clarity and expediency.
Compilation date
None. Acknowledgment of the National Atlas of the United States of America and (or) the U.S. Geological Survey would be appreciated in products derived from these data.
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Nancy Shock, Digital Cartographer, U.S. Geological Survey, assisted in the digital compilation of this map.
The line attributes were manually checked by assigning unique line types to the values and then plotting the data. The plots were then compared to the source. The polygon attributes were checked by visually comparing the final colored plots to maps at various larger scales.
Polygon and node topology are present. All polygons are labeled and were tested by using the Arc/INFO command LABELERRORS. All polygons were checked for closure, node errors, overshoots, undershoots, dangles and intersections using Arc/INFO routines. The Arc/INFO commands BUILD and CLEAN were run to ensure the topological consistency of the data set.
This data set contains map unit boundaries and codes for the 48 conterminous States. Boundaries and codes are included for geologic units, metamorphic facies, limits of glacial advance, impact structures, caldera boundaries, and major faults.
The accuracy of the original data was checked by comparing the digital files to several data sources. Both the line work and the polygon labels were checked against the source compilation.
Line work and attributes.
Line work and attributes.
Line work and attributes.
Line work and attributes.
Line work and attributes.
Line work and attributes.
Line work and attributes.
Impact structures
Line work and attributes.
The geologic unit polygons (geolgym075), faults (faultl075), glacial limit lines (glacal075), boundaries of metamorphic provinces (metfacp075), calderas (calderl075), and impact structures (impactx075) were created using the following procedures: Data were compiled on scale-stable clear film at various scales. The lines and points were then digitized and georeferenced using the computer program GSMCAD, written by Van S. Williams, USGS. The program is available at no charge at <http://geology.cr.usgs.gov/maps/software.html>. Polygons, lines, and point features were attributed in GSMCAD.
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The data were exported from GSMCAD into Arc/INFO Generate format, and were imported into Arc/INFO coverages using AML routines provided with GSMCAD.
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Errors in polygon labeling were checked using the LABELERROR routine in ARCPLOT. Node errors were checked using ARCEDIT routines. Colored plots were made to make final checks of the overall coverages.
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Supplementary graphical coverages were created for the faults (faultgl075) and glacial limit lines (glacagl075). These are the same as faultl075 and glacal075 except decoration lines have been added for display purposes. Another coverage was created containing arcs that represent text labels for the polygons (geotxtl075). This is also for display purposes.
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Cut data to the Delaware River Basin and reprojected to Albers
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Internal feature number.
ESRI
1-dimensional element that may or may not surround a 2-dimensional element.
ESRI GIS software
Feature geometry.
ESRI
Area of feature in internal units squared.
ESRI
Perimeter of feature in internal units.
ESRI
Internal feature number.
ESRI
User-defined feature number.
ESRI
Length of feature in internal units.
ESRI
Internal feature number.
ESRI
User-defined feature number.
ESRI
Fault
U.S. Geological Survey
Thrust fault
U.S. Geological Survey
Normal fault
U.S. Geological Survey
Low angle detachment fault
U.S. Geological Survey
Inferred fault
U.S. Geological Survey
The type of fault.
U.S. Geological Survey
A fault is a fracture or fracture zone in the Earth's crust along which one side moves with respect to the other.
U.S. Geological Survey
A thrust fault is a gently inclined fault (less than 45 degrees) along which the principal movement has been more nearly horizontal than vertical.
U.S. Geological Survey
A normal fault is a steeply inclined fault (more than 45 degrees) where rocks above the fault have moved down relative to those below the fault.
U.S. Geological Survey
A large, shallowly-inclined normal fault formed during extension of the Earth's crust.
U.S. Geological Survey
A fault that is assumed to be at the specified location.
U.S. Geological Survey
The representation of the entity in the data.
U.S. Geological Survey
2-dimensional element.
ESRI GIS software
The size of the shape in coverage units.
U.S. Geological Survey
The perimeter of the shape in coverage units.
U.S. Geological Survey
Internal feature number.
U.S. Geological Survey
User-assigned feature number.
U.S. Geological Survey
The standard geologic symbol for the rock type.
U.S. Geological Survey
(See table under Text)
U.S. Geological Survey
A letter code representing the geology.
U.S. Geological Survey
(See table under Text)
U.S. Geological Survey
The value recognized by the program GSMCAD and used to create the special font for geologic symbols, e.g. %217 represents the geologic symbol for mesozoic. Because standard fonts available in ARC/INFO do not have the special symbols used for geologic time periods, the symbols were created in GSMCAD and exported as arcs.
U.S. Geological Survey
The values for Text are listed below, along with the associated values for the Mapunit_sy attribute and the values for the Geology attribute. > >MAPUNIT_SY TEXT GEOLOGY >------------------------------------------------------------------- >Q Q Quaternary deposits >nT nT Neogene sedimentary rocks >pgT pgT Paleogene sedimentary rocks >KT KT Cretaceous and Tertiary sedimentary rocks >Mz %217 Mesozoic sedimentary rocks >lMz l%217 Lower Mesozoic (Triassic and Jurassic) > sedimentary rocks >uPz u%216 Upper Paleozoic (Pennsylvanian and > Permian) sedimentary rocks >PzMz %216%217 Paleozoic and Mesozoic sedimentary rocks >mPz m%216 Middle Paleozoic (Silurian, Devonian, and > Mississippian) sedimentary rocks >Pz %216 Paleozoic sedimentary rocks >lPz l%216 Lower Paleozoic (Cambrian and Ordovician) > sedimentary rocks >ZPz Z%216 Upper Proterozoic and Lower Paleozoic > sedimentary rocks >Z Z Upper Proterozoic sedimentary rocks >Y Y Middle Proterozoic sedimentary rocks >P_ %215 Proterozoic sedimentary rocks >X X Lower Proterozoic sedimentary rocks >A A Archean sedimentary rocks >K K Cretaceous sedimentary rocks >Qv Qv Quaternary volcanic rocks >nTv nTv Neogene volcanic rocks >pgTv pgTv Paleogene volcanic rocks >Kv Kv Cretaceous volcanic rocks >Mzv %217v Mesozoic volcanic rocks >lMzv l%217v Lower Mesozoic (Triassic and Jurassic) > volcanic rocks >PzMzv %216%217v Paleozoic and Mesozoic volcanic rocks >mPzv m%216v Middle Paleozoic volcanic rocks >lPzv l%216v Lower Paleozoic volcanic rocks >ZPzv Z%216v Upper Proterozoic and Lower > Paleozoic volcanic rocks >Zv Zv Upper Proterozoic volcanic rocks >Yv Yv Middle Proterozoic volcanic rocks >Xv Xv Lower Proterozoic volcanic rocks >pgTg pgTg Paleogene granitic rocks >pgTi pgTi Paleogene intermediate rocks >pgTm pgTm Paleogene mafic rocks >KTg KTg Cretaceous and Tertiary granitic rocks >Kg Kg Cretaceous granitic rocks >Mzg %217g Mesozoic granitic rocks >lMzg l%217g Early Mesozoic granitic rocks >lMzm l%217m Early Mesozoic mafic rocks >lMzu l%217u Early Mesozoic ultramafic rocks >uPzg u%216g Late Paleozoic granitic rocks >mPzg m%216g Middle Paleozoic granitic rocks >mPzm m%216m Middle Paleozoic mafic rocks >lPzg l%216g Early Paleozoic granitic rocks >ZPzg Z%216g Late Proterozoic and Early Paleozoic > granitic rocks >ZPzm Z%216m Late Proterozoic and Early Paleozoic > mafic rocks >P_g %215g Proterozoic granitic rocks >Yg Yg Middle Proterozoic granitic rocks >Ym Ym Middle Proterozoic mafic rocks >Ya Ya Middle Proterozoic anorthositic rocks >Xg Xg Early Proterozoic granitic rocks >Xm Xm Early Proterozoic mafic rocks >Ag Ag Archean granitic rocks >Zg Zg Late Proterozoic granitic rocks >n n Gneiss, age uncertain >ZPzn Z%216n Late Proterozoic and Early Paleozoic gneiss >Yn Yn Middle Proterozoic gneiss >Xn Xn Early Proterozoic gneiss >An An Archean gneiss >PzMzm %216%217m Paleozoic and Mesozoic mafic rocks >Tv Tv Tertiary volcanic rocks >nTg nTg Neogene granitic rocks >H2o H2o Water body >
U.S. Geological Survey
The shade pattern number from the ARC/INFO shadeset geoshade.shd.
U.S. Geological Survey
Percentage values used to produce colors.
U.S. Geological Survey
Percentage values used to produce colors.
U.S. Geological Survey
Percentage values used to produce colors.
U.S. Geological Survey
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Although these data have been processed successfully on a computer system at the USDA Forest Service, no warranty expressed or implied is made by the US Forest Service regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the US Forest Service in the use of these data.
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