Road Log, Day Seven: Morning; Sequence Stratigraphy and Facies Architecture of an Exhumed Tocito Sandbody.
Published:January 01, 1991
1991. "Road Log, Day Seven: Morning; Sequence Stratigraphy and Facies Architecture of an Exhumed Tocito Sandbody.", 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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0.0 Leave Holiday Inn parking lot, turn right on Broadway.
0.2 Intersection with Butler/Pinon, continue straight on Broadway.
1.7 Intersection of Main street and Broadway. Drive straight heading west on US 64.
3.4 Junction with road 170. Straight on.
11.8 Turn left on San Juan County Road 6675 to Fruitland and Four Corners Power Plant.
12.7 Intersection with San Juan County Road 6677. Go straight on 6675.
13.1 Cross the San Juan River.
15.7 Turn right on a wide dirt road which shortly becomes paved and is signposted for Da Na Has Ta (Full Gospel Church). Now heading west.
16.1 The road becomes paved.
16.8 Pass a sign reading Da Na Has Ta.
17.4 Pass water tower on left. Four Corners Power Plant clearly visible to the left (south). The Hogback is straight ahead.
21.5 The road crosses through the Cliff House Sandstone cropping out along the Hogback. Ship Rock can be seen in the distance to the left.
23.2 Pass a dirt road to the right. There are pump jacks on either side of the road. These pump jacks are part of the Hogback oil field producing from the Dakota Sandstone at relatively shallow depth and the much deeper Pennsylvanian Hermosa Group.
24.2 Crossing the bridge over Chaco River.
24.6 Turn left across cattleguard on to dirt road. The road forks, take the left fork.
25.1 Road splits. Continue straight ahead on main dirt road. Ahead is a good view of the Hogback.
25.2 Reach a four-way intersection. Proceed
Figures & Tables
Sequence Stratigraphy Applications to Shelf Sandstone Reservoirs: Outcrop to Subsurface Examples
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..