Cambrian and Early Ordovician Stratigraphy and Paleontology

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Published by means of 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 assessment of the geology of the Basin and diversity province and an advent to Cambrian and Early Ordovician stratigraphy and paleontology. Emphasis can be put on nearby stratigraphy, depositional environments, biofacies and lithofacies family, biostratigraphy, trilobite mass extinctions ("biomere boundaries"), proof for eustatic sea-level adjustments, paleotectonic heritage, and paleogeographic reconstructions. A transect might be made throughout a overdue Cambrian and Early Ordovician passive continental margin from deep-water-carbonate submarine-fan and slope facies in principal Nevada to temporally identical shallow-water microbial bioherms, and carbonate sand and dirt facies in japanese Nevada.

Chapter 2 Geology of the Basin and variety 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: past due Cambrian and Early Ordovician Stratigraphy, Biostratigraphy and Depositional Environments, sizzling Creek diversity, Nevada (pages 28–36): Harry E. cook dinner, Michael E. Taylor and James F. Miller
Chapter 6 Day three: past due Cambrian and Early Ordovician Biostratigraphy and Depositional Environments of the Whipple Cave Formation and condo Limestone, crucial Egan variety, Nevada (pages 37–44): Michael E. Taylor, Harry E. prepare dinner and James F. Miller
Chapter 7 Day four: past due Cambrian and Early Ordovician Stratigraphy and Biostratigraphy, Southern apartment 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 critical residence variety and Drum Mountains, Utah (pages 59–72): Margaret N. Rees and Richard A. Robison
Chapter nine a pragmatic box consultant 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

Example text

T h e Cambrian section h e r e is very similar to the o n e at Titanothere Canyon, but it is slightly metamorphosed. N e a r the north end of B a r e Mountain, a Middle Ordovician section just below t h e summit contains a major organic buildup, Meiklejohn bioherm, that includes a rich assortment of sponges and other fossils (Ross, 1972). T h e bioherm can b e seen by looking back from the highway after passing through Beatty. All outcrops in the immediate vicinity of Beatty consist of Tertiary volcanic rocks.

Bevifrons (Kobayashi). T h e assemblage probably represents the Missisquoia depressa Subzone, but the nominal species is absent. Conodonts from these strata a r e assigned to various subzones of the Cordylodus proavus Z o n e . F r o m the base of this unit, at 123 m to 155 m, the fauna includes C. proavus, Hirsutodontus hirsutus, and H rarus Miller; these are assigned to the H. hirsutus Subzone. T h e presence of Fryxellodontus inornatus at 155 m marks the base of the F. inornatus Subzone, which continues up to 163 m.

95 assuming a speed of about 100 km per hour. F o r the first 40-45 minutes, the highway follows the Las Vegas Valley, which is the site of the major rightlateral strike-slip Las Vegas fault zone of late Tertiary age. Oroclinal deflection of regional strikes by t h e rightlateral stresses is beautifully developed in the mountains to the north and south. Directly ahead, during the first 5-10 minutes of this segment of the trip, the eastern end of the Spring Mountains is excellently illuminated in t h e morning light.

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