Cretaceous Shelf Sandstones and Shelf Depositional

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

The moment subject matter specializes in higher Cretaceous coastal and shallow marine rocks as displayed through exposures within the surprising publication Cliffs of Utah. The shelf and shoreface sequences obvious in those rocks signify a number of the classical exposures of such facies within the usa. as a result of excessive charges of sediment yield from the within reach actively uplifting Cretaceous Sevier orogenic belt, the Mesaverde crew within the booklet Cliffs is ruled by way of regressive sequences, punctuated by means of locally huge unconformities.

Chapter 1 Deltaic and Lacustrine Facies of the golf green River Formation, Southern Uinta Basin, Utah (pages 1–11): Robert R. Remy
Chapter 2 Stratigraphy and Sedimentation of the ebook 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 platforms structure of Shallow Marine Sequences (pages 35–79): Dag Nummedal, Robyn Wright, Donald J. P. fast, Roderick W. Tillman and Niels R. Wolter

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Additional 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

Sample text

Sea level cycles in the upper Turonian (three falls in one million years) is consistent with the complex stratigraphy of this part of the section in the San Juan Basin and the suggestive evidence for as many as three unconformities in that interval. The chrono-stratigraphic model is included here as a basis for discussion and hopefully as a stimulus to further detailed biostratigraphic work in the basin. STOP 14. SHIP ROCK WASH. 1 Access (Fig. 4-5) Stops 14, 15, and 16 are on the Navajo reservation.

32 4 4 1 1 I ^ J 12°-192° 7°-187° I 10°-190° I MC-3-888 T32N, R16W co 3- £ . ± i i 8 8 8 r UJJJ Interpretation Description z % L Unit 15: Grain size: 150-160pm. Coarsening up. Low an­ gle undulatory lams to hummocky cross strati­ fied with wave oscillation ripples. Siderite nodule horizons at 42 and 44m. fine ss. at base, highly bioturbated. Unit 14: Grain size: 130-170pm. Coarsening up. 5m. fine sandstone. Unit 12: Grain size: 175pm. Flaggy weathering HCS sandstone with thin organic shale partings.

Sandstone beds 2cm thick, increasing upward. Unit 4: Grain size: 140 pm. Hummocky cross stratified to flaggy at top. Unit 3: Partly covered, interbedded silty shale and v. fine sandstone. Hummocky sandstones fine up at top. Few plant frags. Unit 2: Grain size: 120-150pm, coarsening up. Hum­ mocky cross stratified to flaggy at top. Unit 1: Mostly covered, interbedded shale, shaley silt, and v. fine hummocky (HCS) sandstone. Sand­ stones 0-10cm thick. Description Unit 30: Grain size: 250-350pm, bimodal.

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