Sequence stratigraphic analysis of high frequency sequences: Cozzette sandstone member, Mount Garfield formation, Book Cliffs, Colorado

The Cozzette Sandstone Member of the Mount Garfield Formation, studied in the Book Cliffs exposure near Grand Junction, Colorado, comprises approximately 55 to 60 m of marine (shoreface) and nonmarine (fluvial) to marginal marine (estuarine) strata contained within five high-frequency depositional sequences. The first sequence (CR3) straddles the lithostratigraphic boundary with the underlying Corcoran Sandstone Member, and consists of a wave-dominated shoreface succession (PS1-CR3) recognized as a highstand systems tract (HST). Sequence CR3 underlies the second sequence (CZ1). CZ1 consists of an incised-valley fill (IVF 1), representing either a transgressive systems tract (TST) or lowstand systems tract (LST). IVF1 is overlain by two wave-dominated shoreface parasequences (PS1-CZ1 and PS2-CZ1), identified as a HST. An incised-valley fill (IVF2) of the third sequence (CZ2) erosionally overlies PS2-CZ1. IVF2 (TST or LST) is erosionally truncated by a sequence boundary, which underlies the incised-valley fill deposits (IVF3) of the fourth sequence (R1). (Abstract shortened by UMI.)...