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<br />2882 <br /> <br />Junction Creek Sandstone <br /> <br />. General characteristics.--Overlying the Summerville <br />Formation is a conspicuous sandstone unit called the <br />Junction Creek Sandstone. This is the prominent sandstone <br />unit at the top of the Summerville Formation in Four <br />Corners area. In Utah this prominent sandstone was named <br /> <br /> <br />the Bluff Sandstone Member of the Morrison Formation by <br /> <br /> <br />Gregory (1938, p. 58). Later, geologists, noting inter- <br /> <br /> <br />tonguing with the underlying Summerville as well as with <br /> <br /> <br />the overlying Morrison, treated the Bluff as a separate <br /> <br /> <br />formation. In southwestern Colorado, this unit was defined <br /> <br />as the Junction Creek Sandstone Member of the Morrison <br /> <br /> <br />Formation (Goldman and Spencer, 1941, p. 1750-1751). The <br /> <br /> <br />Junction Creek in southwestern Colorado is now treated as <br /> <br /> <br />tt a separate formation (Eckel and others, 1949, p. 20, Craig <br /> <br /> <br />and others, 1955, p. 133). The Junction Creek directly <br /> <br /> <br />correlates with the Bluff Sandstone of Utah and Arizona, <br /> <br />but, because the exposures of the Ute Mountain area are <br />in Colorado, the southwestern Colorado nomenclature of <br /> <br />Junction Creek Sandstone is used in this report. <br /> <br />. <br /> <br />,tJ.:z.. <br />