Some Middle Ordovician brachiopods and trilobites from the Basin Ranges, western United States

1967 ◽  
Author(s):  
Reuben James Ross ◽  
Harley Barnes
Keyword(s):  
United States ◽  
Western United States ◽  
Middle Ordovician

New Lower and Middle Ordovician stelleroids (Echinodermata) and their bearing on the origins and early history of the stelleroid echinoderms

1993 ◽  
Vol 67 (1) ◽  
pp. 103-113 ◽  
Author(s):  
Daniel B. Blake ◽  
Thomas E. Guensburg
Keyword(s):  
United States ◽  
North America ◽  
Early History ◽  
Western United States ◽  
Middle Ordovician ◽  
History Of

Ophioxenikos langenheimi n. gen. and sp. (class Somasteroidea), Stibaraster ratcliffei n. gen. and sp., and Cnemidactis? macroadambulacralatus n. sp. (both class Asteroidea) are new stelleroid echinoderms described from Lower and Middle Ordovician strata of the western United States. Stibaraster clearly is at the asteroid grade of organization, although an early representative of the class. Ophioxenikos is the first fossil somasteroid recognized from beyond Europe. It is similar to Chinianaster and Villebrunaster, ambulacral characters of all three suggest affinities with ophiuroids. Cnemidactis? is recognized from North America; it is unusual in the presence of proportionately large marginal ossicles. An indeterminate species is unusual in its structural parallels with living taxa. In recent years, the possibility that edrioasteroids were ancestral to stelleroids has been revived. Supporting arguments for this hypothesis neglect important differences; ancestry of stelleroids remains uncertain.

Trilobites at the base of the Middle Ordovician, western United States

1996 ◽  
Vol 70 (1) ◽  
pp. 73-99 ◽  
Author(s):  
Richard A. Fortey ◽  
Mary L. Droser
Keyword(s):  
United States ◽  
New Species ◽  
Type Species ◽  
Western United States ◽  
Middle Ordovician ◽  
Regional Correlation ◽  
The U.S

Sections in the Basin Ranges provide stratigraphic standards for the Ordovician of the U.S., from which zones based on trilobites have been widely employed in regional correlation. This paper describes new trilobite faunas from a poorly known part of the succession, at the base of the Middle Ordovician (Whiterockian) in western Utah and eastern Nevada, and including the type Ibexian section near Ibex, Utah. The faunas are from the topmost Wahwah, and overlying Juab Limestone Formations, in strata equivalent to Zone L. Although well-preserved, none of the trilobites are silicified. All are typical of inshore carbonate, Bathyurid biofacies. The majority are new species congeneric with, but different from species from the overlying Kanosh Formation. The dominant bathyurid is the hitherto little-knownPsephosthenaspis, after which the new Zone is named. A threefold subdivision of thePsephosthenaspisZone is based on successive species of the genus. The lower two of these are probably equivalent to the Valhallan Stage, described from more offshore biofacies from Spitsbergen. Eighteen species are described, of which nine are formally named as new including:Goniotelina ensifer, Petigurus inexpectatus, Psephosthenaspis microspinosa, M. glabrior, Pseudoolenoides aspinosus, Ectenonotus progenitor, Kanoshia reticulataandPseudomera arachnopyge.The type species of a remarkable new illaenid-like bathyurelline,Madaraspis magnificagen. et sp. nov., is described.

Writing Time in Metaphors

2018 ◽  
Author(s):  
Jennifer J. Smith
Keyword(s):  
United States ◽  
The United States ◽  
Western United States ◽  
Entire System ◽  
Language And Culture ◽  
Space Race ◽  
Do So

Coherence of place often exists alongside irregularities in time in cycles, and chapter three turns to cycles linked by temporal markers. Ray Bradbury’s The Martian Chronicles (1950) follows a linear chronology and describes the exploration, conquest, and repopulation of Mars by humans. Conversely, Louise Erdrich’s Love Medicine (1984) jumps back and forth across time to narrate the lives of interconnected families in the western United States. Bradbury’s cycle invokes a confluence of historical forces—time as value-laden, work as a calling, and travel as necessitating standardized time—and contextualizes them in relation to anxieties about the space race. Erdrich’s cycle invokes broader, oppositional conceptions of time—as recursive and arbitrary and as causal and meaningful—to depict time as implicated in an entire system of measurement that made possible the destruction and exploitation of the Chippewa people. Both volumes understand the United States to be preoccupied with imperialist impulses. Even as they critique such projects, they also point to the tenacity with which individuals encounter these systems, and they do so by creating “interstitial temporalities,” which allow them to navigate time at the crossroads of language and culture.

Characterizing fire behavior from laboratory burns of multi-aged, mixed-conifer masticated fuels in the western United States

2018 ◽  
Author(s):  
Faith Ann Heinsch ◽  
Pamela G. Sikkink ◽  
Helen Y. Smith ◽  
Molly L. Retzlaff
Keyword(s):  
United States ◽  
Fire Behavior ◽  
Western United States ◽  
Mixed Conifer

Women's Studies in the Western United States

NWSA Journal ◽  
2004 ◽  
Vol 16 (2) ◽  
pp. 180-189
Author(s):  
Karen L. Salley ◽  
Barbara Scott Winkler ◽  
Megan Celeen ◽  
Heidi Meck
Keyword(s):  
United States ◽  
Women's Studies ◽  
Western United States ◽  
Women’S Studies
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