Road Log Day 2: High-Frequency Sequence Stratigraphy and Facies Architecture of the Kenilworth Member of the Blackhawk Formation, Book Cliffs, Utah
David R. Taylor, 1991. "Road Log Day 2: High-Frequency Sequence Stratigraphy and Facies Architecture of the Kenilworth Member of the Blackhawk Formation, Book Cliffs, Utah", Sequence Stratigraphy Applications to Shelf Sandstone Reservoirs: Outcrop to Subsurface Examples, J. C. Van Wagoner, C. R. Jones, D. R. Taylor, D. Nummedal, D. C. Jennette, G. W. Riley
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OBJECTIVE: During Day 2 of the field trip we will examine the stratigraphic architecture of the Kenilworth Member of the Blackhawk Formation and demonstrate how high-frequency cyclicity is expressed in wave-dominated shoreline deposits. Participants will be shown sedimentary facies, parasequence stacking patterns, regional truncation surfaces and lateral changes in depositional environments. Discussion will focus on how these elements are interpreted within a sequence stratigraphic framework.
The Kenilworth Member is Campanian in age (Speiker, 1931; Young, 1957; 1955) and occurs near the middle of the Blackhawk Formation (Fig. 2-1). During the day we will make five stops (Fig. 2-2), beginning approximately half-way along the lateral extent of the Kenilworth exposures. The objective will be to trace the sandstones in a basinward direction, observing sequence stratigraphic and facies relationships.
0.0 Depart Green River, Utah from the parking lot of the West Winds Rodeway Inn Motel and drive west along Main St (Loop 70). Turn west on Interstate 70.
4.3 Tum north on Hwy 6/50 towards Price, Utah. The Kenilworth Member is the lowest cliff-forming sandstone succession exposed on the east side of the highway.
26.9 Pass Price River Canyon access road (Stop 3) on the right-hand side of Hwy 6/50. There is an old abandoned gas station with a blue and red sign that says “Food and Fuel” on the west side of the highway just before the access road.
49.1 - Turn east on Hwy 123 at Sunnyside Junction and drive toward the town of Sunnyside.
59.0 - STOP ONE, A:
Figures & Tables
The Lower Sego provides an opportunity to study well-exposed, high-frequency sequences and their systems tracts. Criteria for identification of sequence boundaries will presented. Sequences and their boundaries will be contrasted with parasequences and their bounding surfaces. The Upper and Lower Sego contain well-exposed tidal deposits within the lowstand systems tracts of high-frequency sequences. These tidal deposits and their relationship to incised valleys and systems tracts will be examined. The incised valley interpreted to form during relative falls in sea level will be contrasted with distributary channels related to autocyclic mechanisms.
0.0 Leave the parking lot of the Grand Junction Hilton. Grand Junction , Colorado. Turn left onto Horizon Drive. Pass under the 1-70 bridge, Turn left into the entrance ramp for 1-70 west.
0.2 Enter 1-70 heading west toward the Colorado –Utah State line. For the next 20 miles the Interstate will parallel the Colorado River flowing along the west side of the Grand Valley. The Interstate is built on the gray Cretaceous Mancos Shale. To the west of the Colorado River are the red cliffs of the Colorado National Monument. The Monument is operated by the National Park Service. These cliffs are the eastern edge of the Uncomahgre Uplift. As you drive north along the Interstate, the steeply dipping eastern limb of the Uncomahgre is clearly visible. This tight monoclinal fold is the result of horizontal compressional tectonics associated with Laramide deformation (Heyman, 1983). The red rocks in the Mounment include, from stratigraphically oldest to youngest: the Chinle Formation forming the lower, less resistant slops, the Wingate formation forming the massive cliffs up to 400 feet thick , the Kayenta Formation overlain by an unconformity along which the Navajo and Curtis Formations are missing , the Summerville and Entrada Formations, and the Morrison Formation consisting of fluvial sandstones and associated mudstones, within which some of the earliest dinosaur bones in North America were discovered in the late 19th century. The Jurassic Morrison Formation is unconformably overlain by the brown, Cretaceous, coal-bearing Dakota Sandstone. The Dakota caps many of the high mesas within the Mounment and forms well-exposed dip slopes along the Interstate in the vicinity of the exit to Mack, Co..