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A new bathymetric map of Englebright Lake, Yuba-Nevada Counties,California is compared to 1939 elevations captured from a pre-damtopographic survey to determine how much sediment has accumulatedin the reservoir in the past 60 years. A longitudinal profilealong the entire length (thalweg) of the reservoir and cross-sectionsacross the reservoir at seven points illustrate the pre-dam andpresent bottom profiles. Calculations of the total volume ofsediment impounded by the dam for eight regions of the reservoirare presented.
Contours of potentially minable thickness for the Fire Clay coal zone in Virginia, Kentucky, and West Virginia
This dataset represents the thickness of the potentially minable Fire Clay coal benches in Virginia, West Virginia, and Kentucky. The coal zone is known by other names, depending upon locale. The data were comprised of values from Kentucky in EXCEL format, data searched from the USGS' NCRDS database for Virginia and entered into StratiFact, and a StratiFact database obtained from the West Virginia Geological and Economic Survey (WVGES). Point data were gridded, the grid contoured and imported to ARC/INFO as polygons. The Kentucky portion was replaced by a polygonal thickness coverage obtained from the Kentucky Geological Survey that had been manually contoured, therefore State line discrepancies are to be expected....
The 2018 lower East Rift Zone eruption of Kilauea Volcano began in the late afternoon of 3 May, with fissure 1 opening and erupting lava onto Mohala Street in the Leilani Estates subdivision, part of the lower Puna District of the Island of Hawai'i. For the first week of the eruption, relatively viscous lava flowed only within a kilometer (0.6 miles) of the fissures within Leilani Estates, before activity shifted downrift (east-northeast) and out of the subdivision during mid-May. Around 18 May, activity along the lower East Rift Zone intensified, and fluid lava erupting at higher effusion rates from the downrift fissures reached the ocean within two days. Near the end of May, this more vigorous activity shifted...
Isopach of the combined thickness of the Calico and A-sequences of the John Henry Member of the Straight Cliffs Formation in the Kaiparowits Plateau study area, southern Utah
This is a polygon coverage of contours of the combined thickness of the Calico and A-sequences in the Kaiparowits Plateau study area. The outside polygon defines the base of the coal-bearing John Henry Member of the Straight Cliffs Formation east of 112 degrees of longitude. The area within this polygon includes parts of the coal-bearing John Henry Member where the entire section may not be represented due to erosion. The northern boundary is delineated by the Paunsaugunt fault and volcanic rocks of Tertiary age.
Cumulative Thickness Isopachs in the Sparta Sand from Plate 10, 1968, from Hydrologic significance of the lithofacies of the Sparta Sand in Arkansas, Louisiana, Mississippi, and Texas (Payne, 1968)
The study of the geohydrology of the Sparta Sand is the initial phase in the investigation of the geohydrology of the Claiborne Group. The thicker sections of the Sparta Sand lie along the axes of the Mississippi embayment and Desha basin. The area of maximum thickness, 1,100-1,200 feet, is in Claiborne and Warren Counties, Miss., and Madison Parish, La. Local thickening or thinning over some structures indicates structural movement during Sparta time. A sand-percentage map prepared from data derived from interpretation of electric logs indicates that the Sparta Sand was deposited as a delta-fluvial plain complex in Arkansas, Louisiana, and Mississippi. This complex shows a text-book example of a well-developed...