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Data format: Shapefile File or table name: Geoth_KlamCounty_FINAL2 Coordinate system: Geographic Theme keywords: Earth science, Geology, Economic geology |
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Abstract:
The area of the Klamath Falls geologic map lies east of the High Cascades at the south end of Upper Klamath Lake, Oregon. Map coverage includes all of the Klamath Falls and adjoining Altamont quadrangles to the east, approximately 20 percent of the Wocus quadrangle immediately north of Klamath Falls and approximately10 percent of the adjacent Whiteline Reservoir quadrangle to the northeast. (The map boundaries also encompass the urban growth boundary for the City of Klamath Falls.)
Situated in the extreme northwestern part of the Basin and Range province, the quadrangles are dominated by the horst and graben topography resulting from the extensional tectonics that characterize the Basin and Range of southeast Oregon. The northwest-trending normal faults that bound Upper Klamath Lake and form the Klamath graben expose up to 480 m of volcanic and sedimentary rocks, ranging in age from late Miocene to Holocene. Upper Klamath Lake and surficial deposits of lake and river sediment cover approximately 25 percent of the map area. The dominant structures in the quadrangles are N. 30°-40° W.-striking normal faults that rotate fault blocks northeastward on the northeast side of the area and southwestward on the southwest side.
Rock in the area is chiefly ~2-7 Ma dark gray lava (basalt and basaltic andesite) and contemporaneous to younger cream-colored diatomaceous mudstone. Local outcrops of sandstone and conglomerate cap a few low hills. Rocks in the area are the product of complex interaction between sedimentation and Cascade volcanism. Composition and extent of the volcanic rocks was modified after ~4 Ma by Basin and Range extension and decreasing width of the Cascade volcanic arc. By the time of the Pleistocene glaciations (by ~1.6 Ma) Cascade volcanic activity had mostly ceased in the area, as Cascade volcanism continued to narrow toward its present location in the High Cascades. Basin and Range extension continues to pull the area apart, dropping basins lower relative to ridges like Hogback Mountain, while sedimentation, helped along by periodic ash fall from the High Cascades, fills lake basins like Upper Klamath Lake and Round Lake. |
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Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
The area of the Klamath Falls geologic map lies east of the High Cascades at the south end of Upper Klamath Lake, Oregon. Map coverage includes all of the Klamath Falls and adjoining Altamont quadrangles to the east, approximately 20 percent of the Wocus quadrangle immediately north of Klamath Falls and approximately10 percent of the adjacent Whiteline Reservoir quadrangle to the northeast. (The map boundaries also encompass the urban growth boundary for the City of Klamath Falls.) Situated in the extreme northwestern part of the Basin and Range province, the quadrangles are dominated by the horst and graben topography resulting from the extensional tectonics that characterize the Basin and Range of southeast Oregon. The northwest-trending normal faults that bound Upper Klamath Lake and form the Klamath graben expose up to 480 m of volcanic and sedimentary rocks, ranging in age from late Miocene to Holocene. Upper Klamath Lake and surficial deposits of lake and river sediment cover approximately 25 percent of the map area. The dominant structures in the quadrangles are N. 30°-40° W.-striking normal faults that rotate fault blocks northeastward on the northeast side of the area and southwestward on the southwest side. Rock in the area is chiefly ~2-7 Ma dark gray lava (basalt and basaltic andesite) and contemporaneous to younger cream-colored diatomaceous mudstone. Local outcrops of sandstone and conglomerate cap a few low hills. Rocks in the area are the product of complex interaction between sedimentation and Cascade volcanism. Composition and extent of the volcanic rocks was modified after ~4 Ma by Basin and Range extension and decreasing width of the Cascade volcanic arc. By the time of the Pleistocene glaciations (by ~1.6 Ma) Cascade volcanic activity had mostly ceased in the area, as Cascade volcanism continued to narrow toward its present location in the High Cascades. Basin and Range extension continues to pull the area apart, dropping basins lower relative to ridges like Hogback Mountain, while sedimentation, helped along by periodic ash fall from the High Cascades, fills lake basins like Upper Klamath Lake and Round Lake.
The digital geologic map database for the quadrangles have been created as a general-purpose data set that is applicable to land-related investigations in the earth and biological sciences. The quadrangles' database has been generated to further our understanding of bedrock and surficial processes at work in the region and to document evidence for seismotectonic activity in Oregon. The database is designed to serve as a base layer suitable for ecosystem and mineral resource assessment and for building a hydrogeologic framework for the basin(s) in which it occurs. The database is not suitable for site-specific geologic evaluations.
The CD contains digital files with various map coverages created in MapInfo Professional version 7.0 (.tab) and a screen graphic of the map in Adobe PDF format. Digital map coverages are also provided in ArcView version 3.3 Shapefile (.shp) format for ESRI users. Accompanying the screen graphic of the map is a text file (pdf format) describing the map units, a discussion of the quadrangles' structural and geologic history, and an assessment of the quadrangles' geologic hazards and resources. These data are not field-checked and comes with no guarantees as to its accuracy.
publication date
User should use caution when overlaying other data sets and should not make legally binding decisions from this data. These data are subject to change. Acknowledgment of the DOGAMI would be appreciated in products derived from these data (see gms-118-text-print.pdf for additional acknowledgments). Any person using the information presented here should fully understand the data collection and compilation process before beginning their analysis/use. The burden of determining fitness for use lies with the user. To avoid the risk of misinterpretation, invalid results, and erroneous conclusions, the users must consider the original map scale, collection methodology, currency of data, and any other conditions specific to every data element and each dataset as a whole. Potential users are advised to consult with DOGAMI to gain an understanding of the inherent limitations of this data set and its scope of inference. Also, the user must be aware that errors and conditions originating from physical sources involved in developing a dataset may be reflected in the data, and that the digital processing performed during preparation, storage, and transmission of the dataset may have exacerbated such errors and/or introduced additional ones. Data collected and interpreted at a scale of 1:24,000. Many lines and polygon boundaries inferred, accompanying traverse map and point data set (if provided) show where direct observations were made, areas without direct observations were completed with geologic inference and airphoto interpretation. Location error for observed features points, lines, and polygons have a +/- 12.2 m uncertainity and even more for areas covered and not exposed.
313 SW 2nd, Suite D (P.O. Box 1033)
The Oregon Department of Geology and Mineral Industries created and maintains the spatial data sets. Credit should always be given to the data source and/or originator when the data is transferred or printed. Fieldwork by George Priest and Frank Hladky was conducted during 3 months in 1997 and 5 days in 1998. In 1999 Robert Murray remapped the portion of the map overlapping the Wocus quadrangle. See gms-118-text-print.pdf for additional acknowledgments.
The accuracy of the attributes is unknown
Spatial data is presented in the form of points characterizing the geology only in the quadrangles. This dataset does not have topology. The geology was delineated by the geologist on a 1:24,000, 7.5-minute USGS topographic quadrangle. Check plots of the map were reviewed by the mapper and cartographer for consistency with basic geologic principles and general conformity to USGS mapping standards. This data is not field-checked and is an interpretation of the mapper. No guarantees are provided as to its accuracy.
The mapping project as originally designed has been completed for the quadrangles. The geology of the quadrangles is based on relationships gathered from outcrops, float, and rock exposure on foot or vehicle traverses. Portions of the quadrangle may not have been visited or field checked. Interpretation of the geology in the quadrangles was supplemented by examination of the land surface using digital orthophoto quadrangles with 1 m resolution, overlaid with digital line graphs of contour lines and hydrography, and printed out at 1:600 or 1:12,000 scale. Unit properties are described in the text explanation. All geospatial database elements are attributed.
The data cannot be more accurate than the USGS topographic quadrangle from which it was developed. Positional accuracy of geologic contacts vary based on the techniques and quality of mapping. Still the horizontal accuracy of the coverage should be regarded as unknown.
Unknown
Field mapping and aerial photograph interpretation; iterative process. Transfer of geologic linework and point data from field maps and aerial photographs to a scale-stable cartographic base of quadrangles Description of Map Units and Correlation of Map Units Polygons, lines, and points representing geologic features and data points were hand digitized from author-prepared base-stable geologic map at 1:24,000 scale. The resultant coverages were attributed with data describing the geologic units, contacts, structures and point locations. Draft check plots of the geologic map and explanation were created and submitted for peer review. Revisions were made to the geospatial database as needed. Prior to release of map-on-demand files and metadata, the author was given final digital data sets and paper plots for checking against the source map(s) to verify the linework and attributes. Also, the author was asked to check the metadata and accompanying files for completeness and accuracy.
313 SW 2nd, Suite D (P.O. Box 1033)
Internal feature number.
ESRI
Feature geometry.
ESRI
West longitude in degrees
East latitude in degrees.
Name of well, usually name of well owner or name assigned by owner.
County name
W = water; S = spring
Township
S = south township
Range
E = east range
Section
quarter-quarter or quarter-quarter-quarter section listed with largest quarter first; A = northeast quarter; B = northwest quarter; C = southwest quarter; D = southeast quarter, so northeast quarter of southwest quarter would be CA.
Temperature gradient in degrees Centigrade per kilometer
Temperature in degrees Centigrade
Depth in meters
Flow in liters per second
OIT well number assignment for wells on campus property.
For a description of the regional setting, resources, and hazards, in addition to information relating to the data entities and attributes, please see the text that accompanies this publication.
For detailed attribute information contact the Department of Geology and Mineral Industries.
800 NE Oregon Street #5
Contact Nature of the Northwest Information Center by e-mail, phone, or letter explaining what products are needed. All DOGAMI publications, both in and out of print, are available for inspection at the Department's offices (most reports "on file" are in the Portland office only) and at many state-document depository libraries in Oregon, including most Oregon college and university libraries. Publications are also available via interlibrary loan from the Oregon State Library, State Library Building, Salem, OR 97310.
No warranty, expressed or implied is made regarding the accuracy or utility of the data described and/or contained herein, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The Oregon Department of Geology and Mineral Industries shall not be held liable for improper or incorrect use of these data. This information may be updated without notification.
Ordering capability is available through Nature of the Northwest Information Center, 800 NE Oregon Street #5, Portland, Oregon 97232, (503) 872-2750 and a publication list is viewable at: http:/www.naturenw.org
Files for MapInfo. Also, ESRI shapefiles for version 3.x are provided
PLEASE NOTE: conversion to shapefile format changes some characters ( # - .) to underscores; item names over 10 characters are truncated.
Ordering capability is available through Nature of the Northwest Information Center, 800 NE Oregon Street #5, Portland, Oregon 97232, (503) 872-2750 and a publication list is viewable at: http:/www.naturenw.org
Contact The Nature of the Northwest Information Center by e-mail, phone, or letter explaining what products are needed.
800 NE Oregon St Suite 965