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zones of the lower zone (below the Mahogany Zone), are correlatable because <br />of their persistence and lack of contamination by beds of halite and <br />nahcolite. Other zones of oil shale found in the Saline Zone occur in the <br />presence of abundant saline minerals. <br />Natural gas is produced from the Piceance Creek Dome in the northeastern <br />part of the basin. Production comes from sandstones in the lower portion of <br />the Green River Formation, and at greater depths. The lease is located <br />approximately one mile to the north and northwest of the nearest producing <br />gas wells. Nhen nearby wells are drilled, oil shale and nahcolite zones <br />encountered are protected by isolating these areas with cement. <br />G.1.5.2 Paleontological Resources <br />Fossils in the Uinta and Green River Formation are generally poor and of <br />little value. They consist mainly of pollen grains, protozoa, insect parts, <br />plant tissues, and turtle and fish fragments. There are no known or <br />suspected paleontological values on the lease. <br />G.1.5.3 Geologic Ha:tards <br />No major area of land instability overlaps with the lease; however, <br />localized landslides, rockfalls, slumps, debris flows, and minor flash <br />flooding occur along many of the steep drainages (CEI 1983). The site of <br />the proposed surface facilities will be located on a mesa-like ridge, away <br />from potential hazani areas. <br />The Piceance Creek Basin is in seismic risk zone 1, where there is less than <br />10 percent probability during the next 50 years of a minor or major <br />earthquake. <br />There is no known past subsidence within the project area. <br />~• <br />G-21 <br />