Read e-book online Cambrian and Early Ordovician Stratigraphy and Paleontology PDF

ISBN-10: 0875906621

ISBN-13: 9780875906621

ISBN-10: 1118667646

ISBN-13: 9781118667644

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

box journey T125 of the twenty eighth foreign Geological Congress will provide individuals a nearby review of the geology of the Basin and variety province and an advent to Cambrian and Early Ordovician stratigraphy and paleontology. Emphasis may be put on local stratigraphy, depositional environments, biofacies and lithofacies kin, biostratigraphy, trilobite mass extinctions ("biomere boundaries"), proof for eustatic sea-level alterations, paleotectonic heritage, and paleogeographic reconstructions. A transect might be made throughout a past due Cambrian and Early Ordovician passive continental margin from deep-water-carbonate submarine-fan and slope facies in valuable Nevada to temporally identical shallow-water microbial bioherms, and carbonate sand and dust facies in jap Nevada.

Chapter 2 Geology of the Basin and diversity Province, Western usa: an summary (pages 6–13): Harry E. Cook
Chapter three Day zero: Early and heart Cambrian Stratigraphy of Frenchman Mountain, Nevada (pages 14–16): A. R. Palmer
Chapter four Day 1: Early Cambrian Stratigraphy and Paleontology, Southern nice Basin, California?Nevada (pages 17–27): A. R. Palmer and Stephen M. Rowland
Chapter five Day 2: overdue Cambrian and Early Ordovician Stratigraphy, Biostratigraphy and Depositional Environments, scorching Creek variety, Nevada (pages 28–36): Harry E. cook dinner, Michael E. Taylor and James F. Miller
Chapter 6 Day three: overdue Cambrian and Early Ordovician Biostratigraphy and Depositional Environments of the Whipple Cave Formation and condominium Limestone, important Egan diversity, Nevada (pages 37–44): Michael E. Taylor, Harry E. cook dinner and James F. Miller
Chapter 7 Day four: overdue Cambrian and Early Ordovician Stratigraphy and Biostratigraphy, Southern residence diversity (“Ibex Area”), Utah (pages 45–58): James F. Miller and Michael E. Taylor
Chapter eight Days five and six: Cambrian Stratigraphy and Paleontology of the primary apartment variety and Drum Mountains, Utah (pages 59–72): Margaret N. Rees and Richard A. Robison
Chapter nine a pragmatic box advisor for comparing Early Paleozoic Ichnofabric (pages 73–86): Mary L. Droser and David J. Bottjer

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Additional info for Cambrian and Early Ordovician Stratigraphy and Paleontology of the Basin and Range Province, Western United States: Las Vegas, Nevada to Salt Lake City, Utah, July 1-7, 1989

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T h e dominant faunal elements a r e trilo­ bites typical of t h e North American Faunal Province (fig. 6-2; c o m p a r e fig. 5-4). T h e kind of sedimentary boudinage common in t h e lower unit suggests deposi­ tion in shallow, subtidal-shelf water below active wave base, but in well-oxygenated water (Wilson, 1969). This interpretation is further strengthened by (1) t h e strati­ graphic position of the unit directly below, and gradational with, rocks having distinctive shoal-water features and (2) field characteristics that clearly contrast with those of contemporaneous sediments in the Hales Limestone that were deposited farther oceanward.

In contrast, the overlying Tybo Shale is characterized by olive-green shale and thin (1-5 cm thick) interbedded calcisiltite turbidites. T h e turbidites characteristically consist either of parallel laminations (Bouma sequence division Tb), parallel laminations capped by ripple laminations (Bouma sequence divisions Tbc), ripple laminations (Bouma sequence division Tc), or ripple laminations capped by parallel laminations overlain by pelagic sediment (Bouma sequence divisions Tcde). In addition, r a r e directional sole markings (flute and tool casts) and fossil traces are preserved at the bases of some beds.

Strata from 163 to 196 m have yielded Clavohamulus elongatus Miller, C. bulbousus (Miller), Fryxellodontus lineatus Miller, and Semiacontiodus nogamii Miller; this fauna is diagnostic of the C. elongatus Subzone. These strata w e r e deposited during the Lange Ranch Eustatic Event, discussed below. s. sp.. This fauna is assigned to the Symphysurina brevispicata Subzone of the Symphysurina Z o n e and indicates that this trilobite zone is present in the upper part of the Hales Limestone. T h e base of the Symphysurina Z o n e is near the middle of t h e Clavohamulus elongatus conodont zone, which is the position of the base of the Symphysurina Z o n e elsewhere in North America (fig.

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Cambrian and Early Ordovician Stratigraphy and Paleontology of the Basin and Range Province, Western United States: Las Vegas, Nevada to Salt Lake City, Utah, July 1-7, 1989

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