scholarly journals Petroleum exploration plays and resource estimates, 1989, onshore United States; Region 5, West Texas and eastern New Mexico

1993 ◽  
Keyword(s):  
United States ◽  
New Mexico ◽  
Petroleum Exploration ◽  
West Texas

Permian Gastropoda of the southwestern United States: Subulitacea

1988 ◽  
Vol 62 (01) ◽  
pp. 56-69 ◽  
Author(s):  
Douglas H. Erwin
Keyword(s):  
United States ◽  
New Species ◽  
New Mexico ◽  
New Genus ◽  
Southwestern United States ◽  
New Family ◽  
West Texas ◽  
Permian System ◽  
The Family ◽  
The Status

The composition of Permian members of the superfamily Subulitacea is considered, and 12 new species of Subulitacea are described from the silicified fauna of the Permian System of West Texas and New Mexico. Other elements of the gastropod fauna were previously described by Yochelson (1956a, 1960) and Batten (1958).The new genusIschnoptygmais established for subulitaceans possessing a plate-like columellar fold, and includes the new speciesIschnoptygma archibaldiandI. valentinei.The genus is placed within the new family Ischnoptygmidae. New species of Subulitidae areCeraunocochlis deformis, C. elongata, C. kidderi, C. trekensis, Strobeus girtyi, Soleniscus diminutus, S. variabilis, Cylindritopsis hamiltonae, andC. spheroides.The status of the genusLabridensis questioned, but provisionally retained. The assignment of the family Meekospiridae to the Subulitacea is questioned, and a single new species,Meekospira mimiae, is described.

A Look Back at the Permian Reefs of West Texas and New Mexico

1988 ◽  
Vol 7 (2) ◽  
pp. 71-89 ◽  
Author(s):  
J. Rigby ◽  
Ann Millward
Keyword(s):  
World War Ii ◽  
New Mexico ◽  
Early Period ◽  
Petroleum Exploration ◽  
Complex Nature ◽  
University Of Wisconsin ◽  
West Texas ◽  
Early Exploration ◽  
Stratigraphic Nomenclature ◽  
The University

The Permian reef complexes of West Texas and New Mexico are among the classic carbonate sequences in the world and have significantly influenced geologic thinking for over half a century. Study of the reefs can be subdivided into 6 broad periods. The first period involved early exploration of the region, establishment of regional stratigraphic relationships and attempts at dating stratigraphic units. The Guadalupian Fauna typifies this early period. The second period, during the 1920-30's, was a time of early petroleum exploration in the region, following on discovery of the Kendrick Field in Winkler County, Texas, and resulted in attempts to explain the complicated subsurface stratigraphy. Development of a marginal reef model and research on facies relationships between the basin and shelf resulted in refinement of stratigraphic nomenclature.The third period, here termed the King period, was a time of more intense study of the outcrops and their subsurface extensions. It was a time when facies became more clearly differentiated and when the great diversity and abundance of fossils in the region became appreciated. This period ended when World War II curtailed research in the region. The fourth period began after the war, with heightened interest in reefs and paleoecology. It was a time when carbonate petrology and paleoecology rose as major fields of interest. It was also a time of mega-paleontology. Tens of tons of fossiliferous limestones were processed at the U.S. National Museum and the American Museum of Natural History and collections of literally millions of fossils were assembled. The earlier publication of Geology of the Southern Guadalupe Mountains, Texas and the later publication of The Permian Reef Complex of the Guadalupe Mountains Region, Texas and New Mexico characterize the period.The fifth period is marked by the return of industry investigators to study the reefs and associated rocks, perhaps spurred as much by Dunham's "Vadose pisolites in the Capitan reef" as by any single paper. The period was one of concern about origins of the distinctive pisolites of the complex, nature of the massive Capitan Limestone, diagenesis of carbonates and by concern for understanding the economically significant rocks of the backreef sequence. The sixth period, termed the Wisconsin phase, continued research along lines of the fifth period but was a time when faculty and students of the University of Wisconsin, and their associates, re-examined all facies of the Guadalupe Mountain reef complexes as a major effort, while industry became less broadly involved. Those efforts, and those now initiated by faculty and students of the University of Nebraska and Rice University, bring us essentially to date, but much still remains to be discovered and understood about the reef complexes.

scholarly journals The Synoptic Regulation of Dryline Intensity

2007 ◽  
Vol 135 (5) ◽  
pp. 1699-1709 ◽  
Author(s):  
David M. Schultz ◽  
Christopher C. Weiss ◽  
Paul M. Hoffman
Keyword(s):  
United States ◽  
Boundary Layer ◽  
New Mexico ◽  
Short Wave ◽  
Synoptic Scale ◽  
West Texas ◽  
Long Wave ◽  
Surface Cyclone ◽  
The Difference ◽  
Upper Level

Abstract To investigate the role of synoptic-scale processes in regulating the strength of the dryline, a dataset is constructed of all drylines occurring within the West Texas Mesonet (WTM) during April, May, and June of 2004 and 2005. In addition, dewpoint and wind data were collected from stations on the western (Morton; MORT) and eastern (Paducah; PADU) periphery of the WTM domain (230 km across), generally oriented east–west across the typical location of the dryline in west Texas. Drylines were characterized by two variables: the difference in dewpoint between MORT and PADU (hereafter, dryline intensity) and the difference in the eastward component of the wind between MORT and PADU (hereafter, dryline confluence). A high degree of correlation existed between the two variables, consistent with a strong role for dryline confluence in determining dryline intensity. Some cases departing from the strong correlation between these variables represent synoptically quiescent drylines whose strength is likely dominated by boundary layer mixing processes. Composite synoptic analyses were constructed of the upper and lower quartiles of dryline intensity, termed STRONG and WEAK, respectively. STRONG drylines were associated with a short-wave trough in the upper-level westerlies approaching west Texas, an accompanying surface cyclone over eastern New Mexico, and southerly flow over the south-central United States. This synoptic environment was favorable for enhancing the dryline confluence responsible for strengthening the dryline. In contrast, WEAK drylines were associated with an upper-level long-wave ridge over Texas and New Mexico, broad surface cyclogenesis over the southwestern United States, and a weak lee trough—the dryline confluence favorable for dryline intensification was much weaker. A third composite termed NO BOUNDARY was composed of dates with no surface airstream boundary (e.g., front, dryline) in the WTM domain. The NO BOUNDARY composite featured an upper-level long-wave ridge west of Texas and no surface cyclone or lee trough. The results of this study demonstrate the important role that synoptic-scale processes (e.g., surface lee troughs, upper-level short-wave troughs) play in regulating the strength of the dryline. Once such a favorable synoptic pattern occurs, mesoscale and boundary layer processes can lead to further intensification of the dryline.

Permian Gastropoda of the southwestern United States: Subulitacea

1988 ◽  
Vol 62 (1) ◽  
pp. 56-69 ◽  
Author(s):  
Douglas H. Erwin
Keyword(s):  
United States ◽  
New Species ◽  
New Mexico ◽  
New Genus ◽  
Southwestern United States ◽  
New Family ◽  
West Texas ◽  
Permian System ◽  
The Family ◽  
The Status

The composition of Permian members of the superfamily Subulitacea is considered, and 12 new species of Subulitacea are described from the silicified fauna of the Permian System of West Texas and New Mexico. Other elements of the gastropod fauna were previously described by Yochelson (1956a, 1960) and Batten (1958).The new genus Ischnoptygma is established for subulitaceans possessing a plate-like columellar fold, and includes the new species Ischnoptygma archibaldi and I. valentinei. The genus is placed within the new family Ischnoptygmidae. New species of Subulitidae are Ceraunocochlis deformis, C. elongata, C. kidderi, C. trekensis, Strobeus girtyi, Soleniscus diminutus, S. variabilis, Cylindritopsis hamiltonae, and C. spheroides. The status of the genus Labridens is questioned, but provisionally retained. The assignment of the family Meekospiridae to the Subulitacea is questioned, and a single new species, Meekospira mimiae, is described.

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