Early Devonian (Pragian) vertebrates from the northern Roberts Mountains, Nevada

2016 ◽  
Vol 90 (4) ◽  
pp. 734-740 ◽  
Author(s):  
Carole J. Burrow ◽  
Michael A. Murphy
Keyword(s):  
United States ◽  
Saudi Arabia ◽  
Species Diversity ◽  
Lower Devonian ◽  
Western United States ◽  
The South ◽  
The West ◽  
Early Devonian ◽  
Northern Margin ◽  
Fossil Fish

AbstractFossil fish are poorly represented in middle Lower Devonian deposits of the western United States. Here we describe vertebrate microremains from mid-Pragian levels in the Kobeh Member, McColley Canyon Formation, central Nevada. The species diversity of the assemblages is low and dominated by the acanthodian Nostolepis costata Goujet, 1976. This species is found in older (late Lochkovian–early Pragian) deposits in France and Spain and mid-Pragian or slightly younger deposits in Saudi Arabia. This distribution suggests dispersal to the west from the Armorica terrane around the south of Laurussia to the Nevada region, and southeastward to Arabia, on the northern margin of Gondwana.

scholarly journals A Climatology of 500-hPa Closed Lows in the Northeastern Pacific Ocean, 1948–2011

2014 ◽  
Vol 53 (6) ◽  
pp. 1578-1592 ◽  
Author(s):  
Nina S. Oakley ◽  
Kelly T. Redmond
Keyword(s):  
United States ◽  
Pacific Ocean ◽  
Interannual Variability ◽  
West Coast ◽  
The United States ◽  
Western United States ◽  
The West ◽  
Reanalysis Dataset ◽  
The Pacific ◽  
Northeastern Pacific

AbstractThe northeastern Pacific Ocean is a preferential location for the formation of closed low pressure systems. These slow-moving, quasi-barotropic systems influence vertical stability and sustain a moist environment, giving them the potential to produce or affect sustained precipitation episodes along the west coast of the United States. They can remain motionless or change direction and speed more than once and thus often pose difficult forecast challenges. This study creates an objective climatological description of 500-hPa closed lows to assess their impacts on precipitation in the western United States and to explore interannual variability and preferred tracks. Geopotential height at 500 hPa from the NCEP–NCAR global reanalysis dataset was used at 6-h and 2.5° × 2.5° resolution for the period 1948–2011. Closed lows displayed seasonality and preferential durations. Time series for seasonal and annual event counts were found to exhibit strong interannual variability. Composites of the tracks of landfalling closed lows revealed preferential tracks as the features move inland over the western United States. Correlations of seasonal event totals for closed lows with ENSO indices, the Pacific decadal oscillation (PDO), and the Pacific–North American (PNA) pattern suggested an above-average number of events during the warm phase of ENSO and positive PDO and PNA phases. Precipitation at 30 U.S. Cooperative Observer stations was attributed to closed-low events, suggesting 20%–60% of annual precipitation along the West Coast may be associated with closed lows.

Anorogenic magmatism and the Grenvillian Orogeny

1989 ◽  
Vol 26 (3) ◽  
pp. 479-489 ◽  
Author(s):  
Brian F. Windley
Keyword(s):  
United States ◽  
South America ◽  
Continental Margin ◽  
South Atlantic ◽  
Island Arc ◽  
The South ◽  
The West ◽  
Continental Block ◽  
Grenvillian Orogeny ◽  
Alkaline Complexes

The Grenvillian Orogeny was preceded by extensive anorogenic volcanism and plutonism in the period 1500–1300 Ma in the form of rhyolites, epizonal granites, anorthosites, gabbros, alkaline complexes, and basic dykes. An analogue for the mid-Proterozoic anorogenic complexes is provided by the 2000 km by 200 km belt of anorogenic complexes in the Hoggar, Niger, and Nigeria, which contain anorthosites, gabbros, and peralkaline granites and were generated in a Cambrian to Jurassic rift that farther south led to the formation of the South Atlantic. An analogue for the 1 × 106 km2 area of 1500–1350 Ma rhyolites (and associated epizonal granites) that underlie the mid-continental United States is provided by the 1.7 × 106 km2 area of Jurassic Tobifera rhyolites in Argentina, which were extruded on the stretched continental margin of South America immediately preceding the opening of the South Atlantic. The mid-Proterozoic complexes were intruded close to the continental margin of the Grenvillian ocean and were commonly superimposed by the craton-directed thrusts that characterized the final stages of the Grenvillian Orogeny. The bulk of the Keweenawan rift and associated anorogenic magmatism formed about 1100 Ma at the same time as the Ottawan Orogeny in Ontario, which probably resulted from the collision of the island arc of the Central Metasedimentary Belt attached to the continental block in the east with the continental block to the west. The most appropriate modern equivalent would be the Rhine Graben, which formed at the same time as the main Alpine compression.

How the West Was Won: Woman Suffrage in the Western United States, 1868-1914

2005 ◽  
Vol 39 (1) ◽  
pp. 131
Author(s):  
Melanie Gustafson ◽  
Rebecca J. Mead
Keyword(s):  
United States ◽  
Woman Suffrage ◽  
Western United States ◽  
The West

Water Development and Water Planning in the South-Western United States

1969 ◽  
Vol 135 (4) ◽  
pp. 610
Author(s):  
Donald M. Harding ◽  
Johannes Humlum
Keyword(s):  
United States ◽  
Western United States ◽  
The South ◽  
Water Planning ◽  
Water Development

Abstract 15333: Choosing Where to Live or Die: Regional Variation in Outcomes Following Out-of-hospital Cardiac Arrest (OHCA) in the United States

Circulation ◽  
2015 ◽  
Vol 132 (suppl_3) ◽  
Author(s):  
Aiham Albaeni ◽  
May A. Beydoun ◽  
Shaker M. Eid ◽  
Bolanle Akinyele ◽  
Lekshminarayan RaghavaKurup ◽  
...  
Keyword(s):  
United States ◽  
Care Delivery ◽  
The United States ◽  
Hospital Charges ◽  
Trauma Patients ◽  
The South ◽  
The West ◽  
Total Hospital ◽  
North East ◽  
Nationwide Inpatient Sample Database

Background: Regional Differences in health outcomes following OHCA has been poorly studied, and was the focus of this investigation. Methods: We used the 2002 to 2012 Nationwide Inpatient Sample database to identify adults ≥ 18 years old, with an ICD-9 code principal diagnosis of cardio respiratory arrest (427.5) or ventricular fibrillation (427.1). Trauma patients were excluded. In 4 predefined federal geographic regions: North East, Midwest, South and West, means and proportions of total hospital charges (adjusted to the 2012 consumer price index,) and mortality rate were calculated. Multiple linear and logistic regression models, were adjusted for patient demographics, hospital characteristics and Charlson Comorbidity Index. Trends in binary outcome were examined with YearхRegion interaction terms. Results: From 2002 to 2012, of 155,592 OHCA patients who survived to hospital admission , 26,007 (16.7%) were in the Northeast, 39,921 (25.7% ) in the Midwest, 56,263 (36.2%) in the South, and 33,401 (21.5% ) in the West. Total hospital charges (THC) rose significantly over the years across all regions of the United States ( P trend <0.0001), and were higher in the West Vs the North East (THC>$109,000/admission, AOR 1.85; 95% CI 1.53-2.24, p<0.0001), and not different in other regions. Compared to the Northeast, mortality was lower in the Midwest ( AOR 0.86, 95% CI 0.77-0.97 p=0.01), marginally lower in the South ( AOR 0.91, 95% CI 0.82-1.01 p=0.07), with no difference detected between the West and the Northeast ( AOR 1.02, 95% CI 0.90-1.16 P=0.78). Increased expenditure was not rewarded by an increase in survival, as trends in Mortality did not differ significantly between regions (YearхRegion effects P>0.05, P trend =0.29). Conclusions: Nationwide, there is a considerable variability in survival and charges associated with caring for the post arrest patient. Higher charges did not yield better outcomes. Further investigation is needed to optimize health care delivery.

A comparison of earthquake damage areas as a function of magnitude across the United States

1993 ◽  
Vol 83 (4) ◽  
pp. 1064-1080 ◽  
Author(s):  
G. A. Bollinger ◽  
M. C. Chapman ◽  
M. S. Sibol
Keyword(s):  
United States ◽  
North America ◽  
Ground Motion ◽  
Epicentral Distance ◽  
The United States ◽  
Western United States ◽  
Eastern North America ◽  
Similar Response ◽  
Eastern United States ◽  
The West

Abstract This study investigates the relationship between earthquake magnitude and the size of damage areas in the eastern and western United States. To quantify damage area as a function of moment magnitude (M), 149 MMI VI and VII areas for 109 earthquakes (88 in the western United States, 21 in the eastern United States and Canada) were measured. Regression of isoseismal areas versus M indicated that areas in the East were larger than those in the West, at both intensity levels, by an average 5 × in the M 4.5 to 7.5 range. In terms of radii for circles of equivalent area, these results indicate that damaging ground motion from shocks of the same magnitude extend 2 × the epicentral distance in eastern North America compared to the West. To determine source and site parameters consistent with the above results, response spectral levels for eastern North America were stochastically simulated and compared with response spectral ordinates derived from recorded strong ground motion data in the western United States. Stress-drop values of 200 bars, combined with a surficial 2-km-thick low velocity “sedimentary” layer over rock basement, produced results that are compatible with the intensity observations, i.e., similar response spectral levels in the east at approximately twice their epicentral distance in the western U.S. distance. These results suggest that ground motion modeling in eastern North America may need to incorporate source and site parameters different from those presently in general use. The results are also of importance to eastern U.S. hazard assessments as they require allowance for the larger damage areas in preparedness and mitigation programs.

Mail Routes and the Costs of Expansion, 1866–83

Paper Trails ◽  
2021 ◽  
pp. 75-93
Author(s):  
Cameron Blevins
Keyword(s):  
United States ◽  
Western United States ◽  
Post Office ◽  
Public Infrastructure ◽  
The West ◽  
Agency Model ◽  
Administrative Capacity ◽  
The Us

Chapter 4 examines the transportation of mail in the western United States. During the 1860s and 1870s the Post Office Department contracted with private stagecoach companies to carry the mail on its behalf, allowing it to extend mail routes across the region without establishing its own costly public infrastructure. Government mail contracts effectively subsidized the western stagecoach industry and facilitated the region’s breakneck growth during these decades. But staging companies began to lobby, collude, and bribe their way into exorbitant contracts worth millions of dollars, and by the end of the 1870s the situation had devolved into a full-fledged institutional crisis. This chapter is a story about mismanagement, fraud, and corruption, but it also speaks to the federal government’s lack of centralized administrative capacity. The decentralized agency model may have allowed the US Post to rapidly spread across the West, but this frenetic regional expansion project came with considerable costs.

scholarly journals A multivariate spatial analysis of vowel formants in American English

2013 ◽  
Vol 1 (1) ◽  
pp. 31-51 ◽  
Author(s):  
Jack Grieve ◽  
Dirk Speelman ◽  
Dirk Geeraerts
Keyword(s):  
United States ◽  
Spatial Analysis ◽  
American English ◽  
Western United States ◽  
The West ◽  
Acoustic Data ◽  
Vowel Formant ◽  
Multivariate Spatial Analysis ◽  
Vowel Formants ◽  
Vowel Shift

This paper presents the results of a multivariate spatial analysis of thirty-eight vowel formant variables measured in 236 cities from across the contiguous United States, based on the acoustic data from the Atlas of North American English. The results of the analysis both confirm and challenge the results of the Atlas. Most notably, while the analysis identifies similar patterns as the Atlas in the West and the Southeast, the analysis finds that the Midwest and the Northeast are distinct dialect regions that are considerably stronger than the traditional Midland dialect region identified in the Atlas. The analysis also finds evidence that a vowel shift is actively shaping the language of the Western United States.

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