Cretaceous Shelf Sandstones and Shelf Depositional

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Published through the yankee Geophysical Union as a part of the Field journey Guidebooks Series.

The moment subject makes a speciality of top Cretaceous coastal and shallow marine rocks as displayed by way of exposures within the fantastic e-book Cliffs of Utah. The shelf and shoreface sequences obvious in those rocks symbolize many of the classical exposures of such facies within the usa. because of excessive charges of sediment yield from the within sight actively uplifting Cretaceous Sevier orogenic belt, the Mesaverde team within the publication Cliffs is ruled by means of regressive sequences, punctuated by way of domestically huge unconformities.

Chapter 1 Deltaic and Lacustrine Facies of the fairway River Formation, Southern Uinta Basin, Utah (pages 1–11): Robert R. Remy
Chapter 2 Stratigraphy and Sedimentation of the publication Cliffs, Utah (pages 13–24): Rex D. Cole and James F. Friberg
Chapter three Coastal and Shallow Marine Cyclicity (pages 25–33): Robyn Wright, Danny Katzman, Melissa J. Montz and Robert S. Zech
Chapter four Depositional structures structure of Shallow Marine Sequences (pages 35–79): Dag Nummedal, Robyn Wright, Donald J. P. quick, Roderick W. Tillman and Niels R. Wolter

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Extra resources for Cretaceous Shelf Sandstones and Shelf Depositional Sequences, Western Interior Basin, Utah, Colorado and New Mexico: Salt Lake City, Utah to Albuquerque, New Mexico June 30-July 7, 1989

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2 Gallup Sandstone At Shiprock Wash we are close to the seaward pinch-out of the Gallup Sandstone on the Four Corners platform. The Torrivio Sandstone (fluvial) lies directly above the Gallup shoreface with no intermediate nonmarine Gallup facies. Moreover, there is only a thin and discontinuous Dilco Coal Member. A ravinement sur­ face lies directly above the Torrivio Sandstone, sep­ arating this fluvial sandstone from the overlying Tocito Sandstone and the Mulatto Tongue of the Mancos Shale. The Gallup Sandstone at this outcrop is characterized by an upward-coarsening trend, from 125 lm at the base to about 250 lm at the top (Figs.

MANCOS CANYON. LOOKOUT SANDSTONE Transition 5th Order condensed section Transition Amalgamated hummocky shoreface 5th Order Transition 4th Order condensed section 5th Order? Transition ^thOrdejMHJacj^ regression and transgression are an integral component of each cycle. Considering that basin submergence accompanied deposition of Cretaceous strata through the San Juan basin, we suggest that increased sediment yield was the major factor responsible for progradation at the 5th-order scale (aloftg non-deltaic strandlines).

Chimney Rock • ^160 ^ 1^^ \ a MC-3-888 MC-1-688 1 0 mile . 1 1 FIGURE 3-5 Map of access route to the Mancos Canyon stops. S. Highway 666). 2 Purpose In this part of the San Juan Basin the Point Lookout Sandstone reaches its maximum thickness of > 100 m in spectacular exposures that clearly display the forma­ tion's individual component shoreface cycles. , 1941; Molenaar, 1983a]. Shoreline regression occurred in a stepwise fashion, resulting in a series of thick benches and thin steps composed of individual transgressive-regressive shoreface couplets, or cycles [Hollenshead and Pritchard, 1961; Wright, 1986].

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