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the stratigraphy and Tertiary depositional environments of the basin have been given
<br />by Trudell and others (1974), Johnson (1979a, 1979b, 1979c), Roehler (1974),
<br />Lundell and Surdam (1975), Donnell (1982), Pitman (1979, 1982), Pitman and
<br />Donnell (1973) and Pitman and Johnson (1978). Smith (1974), Smith and Lee
<br />(1982), Desborough and Pitman (1974), Brobst and Tucker (1973), Robb and Smith
<br />(1974), Desborough (1978), Desborough and others (1976) and Cole and Picard
<br />(1978) have discussed and summarized the geochemistry and mineralogy of the
<br />Green River Formation.
<br />Summaries of the oil shale resources of the Piceance Creek Basin have been
<br />provided by Murray and Haun (1974), Keighin (1975), Pitman (1979, 1982), Pitman
<br />and Johnson (1978), Donnell and Blair (1970) and Pitman and Donnell (1973), while
<br />quantification and description of saline mineral resources is given in Dyni (1974a,
<br />1974b, 1974c, 1979, 1981), Dyni and others (1970, 1971a, 1971b), Dyni and Hite
<br />(1966 and 1968), Hite and Dyni (1967), Smith and others (1973), Trudell and others
<br />(1970, 1974), Young and Smith (1970), Beard and others (1974), and Cole and
<br />others (1982). Weeks and others (1974), Weeks (1974), Coffin and others (1968,
<br />1971), Welder (1971), Welder and Saulnier (1978), Alley (1982), Taylor (1982),
<br />Birman (1982) and Tait (1982) have provided information on groundwater hydrology.
<br />4.2.2. Physiography
<br />The Piceance Creek Basin is a large northwest-trending structural basin located
<br />within parts of Moffat, Rio Blanco, Garfield, Mesa, Pitkin, Delta and Gunnison
<br />Counties, Colorado; the basin's total extent is about 7,225 square miles (Collins,
<br />1976). Between the White River on the north and Colorado River on the south, the
<br />Piceance structural basin is also a topographic basin, having an areal extent of
<br />about 1,600 square miles (Figure 4-1). Surface elevations within the topographic
<br />basin range from about 8,000 feet along the Roan Cliffs to about 6,000 feet near the
<br />northern margin of the topographic basin. South of the topographic basin, surface
<br />elevations range from less than 4,500 feet along the Colorado River to nearly 12,000
<br />feet near the West Elk Mountains.
<br />Daub & Associates, Inc. Page 4-8 NSI Mine Plan 2010 Rev.
<br />Printed: 7/5/2010 Section 4 Geology
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