Lacustrine Carbonates of the Morrison Formation (Upper Jurassic, Western Interior), East-Central Colorado, U.S.A.

• Autores: Stan P. Dunagan
• Localización: Lake basins through space and time / coord. por Elizabeth H. Gierlowski-Kordesch, K. Kelts, 2000, ISBN 0891810528, págs. 181-188
• Idioma: inglés
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• Resumen

  • Siliciclastic- and carbonate-dominated lacustrine systems are present within the Morrison Formation (Upper Jurassic), Western Interior basin, U.S.A. The siliciclastic dominated systems, common on the Colorado Plateau ,have been studied intensely in association with the extensive Lake T' 00'dichi' complex, an alkaline-salinelake in the Brushy Basin Member of the Morrison Formation(Bell, 1983, 1986; Peterson and Turner-Peterson,1987; Turner and Fishman, 1991). Conversely, the carbonate-dominated lacustrine systems prevalent in east central Colorado, New Mexico, Kansas, and Wyoming have received limited attention (Frazier et al., 1983;Sweet 1984; Lockley et al., 1986; Sweet and Donovan,1988; Johnson, 1991), with few regional-scale and even fewer detailed sediment logic and stratigraphic investigations(exceptions include West, 1978; Jackson, 1979;Dunagan et al., 1996, 1997; Dunagan, 1997, 1998). This study describes the initial results of a systematic, regional scale investigation of lacustrine carbonate deposits in the Morrison Formation focusing on the well-developed lacustrine complex in east-central Colorado, which willultimately provide important insights into one of the most poorly understood depositional environments in the Morrison paleoeco system. Detailed results are forthcoming in other publications.