|Description||During the Pliocene to middle Pleistocene, pluvial lakes in the western Great Basin repeatedly rose to levels much higher than those of the well-documented late Pleistocene pluvial lakes, and some presently isolated basins were connected. Sedimentologic,|
|Originators||U.S. Geological Survey and Reheis, Marith C.|
|Publication||U.S. Geological Survey Miscellaneous Field Studies Map MF-2323|
This data set consists of 10 coverages: late_pl (polygon): Late Pleistocene lake boundaries. FLAG attribute indicates 1=lake present or 0=lake not present. LAKENAME attribute lists lake names. ELEVATION attribute lists lake elevation in meters. max_pl (polygon): Maximum extent of pre-late Pleistocene lakes. Attribute descriptions are the same as those of late_pl dataset. add_pl (polygon): Possible additional area of pre-late Pleistocene lakes. FLAG attribute indicates 1=lake present and 0=lake not present. basin_bnd (line): Boundary of Lahontan basin. No user-defined attributes. add_basin_bnd (line): Inferred increase of drainage basin area. No user-defined attributes. flows (line): Lake overflows. FLAG attribute indicates 1=late Plestocene overflow and 2=possible pre-late Pleistocene overflow and modern sill height. study_sites (point): Field sample sites. DEPOSIT attribute lists types as "pre-late Pleistocene" or "Pliocene." state_bnd (line): State boundaries. No user-defined attributes. majdrain (line): Major drainages in basin. No user-defined attributes. shadebase.tif (TIFF): Georeferenced TIFF file of shaded-relief grid for map base. Produced from DEM grid using the ARC/INFO 'HILLSHADE' command. Georeferencing information is contained in the file shadebase.tfw.
Most late Pleistocene shoreline altitudes and lake names are from Mifflin and Wheat (1979). Lake Warner shoreline from Weide (1975), Lake Alvord shoreline and overflow from Hemphill-Haley (1987), and Lake Coyote shoreline and overflow from Lindberg and Hemphill-Haley (1988). Pre-late Pleistocene shorelines from Reheis and others (1993), Reheis and Morrison (1997), and Reheis and others (in press), except for Lake Wellington (Stewart and Dohrenwend, 1984). See Reheis and others (1993; in press) for information on lake-deposit localities. Hemphill-Haley, M. A., 1987, Quaternary stratigraphy and late Holocene faulting along the base of the eastern escarpment of Steens Mountain, southeastern Oregon: M.S. thesis, Arcata, Humboldt State University, 84 p. Lindberg, D.N., and Hemphill-Haley, M.A., 1988, Late-Pleistocene pluvial history of the Alvord basin, Harney Co., Oregon [abstract]: Northwest Science, v. 62, no. 2, p. 81. Mifflin, M. D., and Wheat, M. M., 1979, Pluvial lakes and estimated pluvial climates of Nevada: Nevada Bureau of Mines and Geology Bulletin 94, 57 p. Reheis, M. C., and Morrison, R. B., 1997, High, old pluvial lakes of western Nevada, in Link, P. K., and Kowallis, B. J., eds., Proterozoic to recent stratigraphy, tectonics, and volcanology, Utah, Nevada, southern Idaho and central Mexico: Provo, Brigham Young University Geology Studies, v. 1, p.459-492. Reheis, M. C., Sarna-Wojcicki, A. M., Reynolds, R. L., Repenning, C. A., and Mifflin, M.D., in press, Pliocene to middle Pleistocene lakes in the western Great Basin: Ages and connections, in Hershler, R., Currey, D., and Madsen, D., eds., Great Basin Aquatic Systems History: Washington D.C., Smithsonian Institution. Reheis, M.C., Slate, J.L., Sarna-Wojcicki, A.M., and Meyer, C.E., 1993, A late Pliocene to middle Pleistocene pluvial lake in Fish Lake Valley, Nevada and California: Geological Society of American Bulletin, v. 105, p. 959-967. Stewart, J. H., and Dohrenwend, J. C., 1984, Geologic map of the Wellington quadrangle, Nevada: U.S. Geological Survey Open file Report 84-211, scale 1:62,500. Weide, D. L., 1975, Postglacial geomorphology and environments of the Warner Valley Hart Mountain area, Oregon: Ph.D. dissertation, Los Angeles, University of California, 293 p.