Rocky Mountain Geology最新文献

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Heart Mountain and South Fork fault systems: Architecture and evolution of the collapse of an Eocene volcanic system, northwest Wyoming: COMMENT 心脏山和南叉断层系统:怀俄明州西北部始新世火山系统崩塌的结构和演化:评论
Rocky Mountain Geology Pub Date : 2011-03-01 DOI: 10.2113/GSROCKY.46.1.71
M. H. Anders, J. Craddock, D. Malone, J. F. Magloughlin
{"title":"Heart Mountain and South Fork fault systems: Architecture and evolution of the collapse of an Eocene volcanic system, northwest Wyoming: COMMENT","authors":"M. H. Anders, J. Craddock, D. Malone, J. F. Magloughlin","doi":"10.2113/GSROCKY.46.1.71","DOIUrl":"https://doi.org/10.2113/GSROCKY.46.1.71","url":null,"abstract":"We would like to begin by paying tribute to Ed Beutner who passed away in 2008. Ed made significant contributions to the continuing debate over one of the most enigmatic features on the surface of the Earth, the Heart Mountain slide block. Ed will be greatly missed and we wish that he were here to respond to our discussion of his most recent paper—we are certain his comments would have been insightful and of interest to all working on the Heart Mountain problem. In lieu of having Ed's response, we are confident that Tom Hauge will provide a vigorous defense picking up the mantle so aptly held by Ed. We have a number of concerns about the slow/fast model presented by Beutner and Hauge (2009). In our view, many of their arguments supporting slow or incremental movement of the Heart Mountain slide block are not supported by the evidence. In addition, we wish to correct certain erroneous statements and omissions about previous work.\u0000\u0000In reference to the “phreatomagmatic-hydraulic” model of Straw and Schmidt (1981a, b), Beutner and Hauge (2009, p. 159) state that “… Aharonov and Anders (2006) provided a refined version of the last model.” The Aharonov and Anders model is not a “refined version” of the Straw and Schmidt model as presented in their 1981a and 1981b abstracts. Straw and Schmidt (1981a) wrote: “eruptive centers exerted explosive pressure on water in the regional fracture system” and that the groundwater “exceeded normal lithostatic stress and ‘lift’ the upper plate.” Aharonov and Anders (2006) proposed that the intrusion of dikes heated trapped ground water and reduced pore space via the Skempton effect (Skempton, 1954), thus causing elevated basal pore pressure, enabling sliding of the upper plate along the extremely low 2° gradient. These two models are only …","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"46 1","pages":"71-75"},"PeriodicalIF":0.0,"publicationDate":"2011-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.46.1.71","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68311141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Characterization of porosity and permeability for CO2 sequestration models in the Mississippian Madison Group, Moxa Arch–LaBarge Platform, southwestern Wyoming 怀俄明州西南部Moxa Arch-LaBarge平台密西西比麦迪逊组CO2封存模型的孔隙度和渗透率特征
Rocky Mountain Geology Pub Date : 2010-09-21 DOI: 10.2113/GSROCKY.45.2.133
G. Thyne, M. Tomasso, S. Bywater‐Reyes, D. Budd, Brian M. Reyes
{"title":"Characterization of porosity and permeability for CO2 sequestration models in the Mississippian Madison Group, Moxa Arch–LaBarge Platform, southwestern Wyoming","authors":"G. Thyne, M. Tomasso, S. Bywater‐Reyes, D. Budd, Brian M. Reyes","doi":"10.2113/GSROCKY.45.2.133","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.133","url":null,"abstract":"Porosity and permeability data for the Mississippian Madison Group in southwestern Wyoming were compiled and evaluated to relate these properties to stratigraphic facies in the Madison Group. The study was performed to provide baseline data for a geologic model required to sequester carbon in the study area. Public domain geological and petrophysical data provided the basis for the evaluation. Using the available database of wire-line logs and core from wells that penetrate the Madison Group, we place the wells within the regional structural and sequence-stratigraphic framework and detail porosity-permeability relationships. The highest porosity and permeability in the study area is present in the lower portion of the formation in dolomitic packstone-to grainstone-dominated facies near the top of the transgressive systems tract. Wire-line logs were used to calculate porosity values that correlate well with the more limited core-based data. The porosity in the Madison Group has a tri-modal distribution with porosity related to depositional facies. The first group is characterized by low porosity ( 12 percent) with a strong log permeability to porosity covariance. While lateral variations in porosity related to depositional facies can be traced over tens of kilometers, natural fractures appear to be a significant control on permeability in the lower porosity portions of the Madison.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"133-150"},"PeriodicalIF":0.0,"publicationDate":"2010-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.133","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Geologic carbon sequestration in Wyoming: prospects and progress 怀俄明州地质碳封存:前景与进展
Rocky Mountain Geology Pub Date : 2010-09-21 DOI: 10.2113/GSROCKY.45.2.83
C. Frost, Anne C. Jakle
{"title":"Geologic carbon sequestration in Wyoming: prospects and progress","authors":"C. Frost, Anne C. Jakle","doi":"10.2113/GSROCKY.45.2.83","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.83","url":null,"abstract":"Coal supplies nearly 50 percent of electricity generation in the United States and 25 percent of the global energy supply; Wyoming produces approximately 40 percent of the coal consumed in the United States. It is likely that near-term energy strategies will include coal and other fossil energy sources in the fuel mix, therefore mitigating carbon dioxide emissions through geologic carbon capture and sequestration (CCS) is crucial. Here we discuss the current state of CCS technology across the globe and its future potential for development. We also outline the current regulatory structure for CCS in the United States, specifically Wyoming, and we introduce the study undertaken by University of Wyoming researchers and their collaborators to characterize Paleozoic deep saline aquifers on the Moxa Arch in southwestern Wyoming for long-term geologic carbon storage. The research presented in this special issue of Rocky Mountain Geology and future research that builds on these findings, such as the site characterization project underway on the Rock Springs Uplift in Wyoming, will be important steps to advance successful CCS technologies at a rate and scale that can make a meaningful impact on greenhouse gas emissions and to construct commercial geologic sequestration projects in the Rocky Mountain West.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"83-91"},"PeriodicalIF":0.0,"publicationDate":"2010-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.83","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Potential impacts of federal regulation of greenhouse gas emissions on Wyoming's energy-derived tax revenue 联邦温室气体排放法规对怀俄明州能源衍生税收的潜在影响
Rocky Mountain Geology Pub Date : 2010-09-21 DOI: 10.2113/GSROCKY.45.2.181
Milton E. Geiger, R. Coupal, D. Mcleod
{"title":"Potential impacts of federal regulation of greenhouse gas emissions on Wyoming's energy-derived tax revenue","authors":"Milton E. Geiger, R. Coupal, D. Mcleod","doi":"10.2113/GSROCKY.45.2.181","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.181","url":null,"abstract":"The implementation of federal climate change legislation would alter the relative price advantages of fossil fuels produced in Wyoming and resultant tax revenue. Our policy model demonstrates changes in the prices and quantities produced of coal, natural gas, oil, and wind energy—including electrical generation and multiplier effects—resulting from federal action. With carbon dioxide equivalent (CO 2 -e) prices ranging from $0–$70/ton, Wyoming tax revenue would increase due to tremendous growth in price and production of natural gas, which substitutes for declines in coal revenue. Wind energy contributions to tax revenue would remain limited due to a low effective tax rate relative to fossil fuels.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"181-191"},"PeriodicalIF":0.0,"publicationDate":"2010-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.181","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Baseline geochemical characterization of potential receiving reservoirs for carbon dioxide in the Greater Green River Basin, Wyoming 怀俄明州大绿河流域潜在二氧化碳接收储层的基线地球化学特征
Rocky Mountain Geology Pub Date : 2010-09-01 DOI: 10.2113/GSROCKY.45.2.93
M. Smith, Shikha Sharma, Teal B. Wyckoff, C. Frost
{"title":"Baseline geochemical characterization of potential receiving reservoirs for carbon dioxide in the Greater Green River Basin, Wyoming","authors":"M. Smith, Shikha Sharma, Teal B. Wyckoff, C. Frost","doi":"10.2113/GSROCKY.45.2.93","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.93","url":null,"abstract":"Geologic sequestration of anthropogenic carbon dioxide (CO 2 ) will be a necessary part of a carbon management strategy for reducing atmospheric CO 2 emissions so long as fossil fuels are a significant part of the energy mix. Proposed federal and state regulations for underground injection of CO 2 require that underground sources of drinking water be protected. Accordingly, proposed federal regulations require analysis of the suitability of different receiving formations for geologic sequestration. This study compiles all available water quality data for four potential CO 2 receiving formations in the Greater Green River Basin of southwestern Wyoming. The Greater Green River Basin encompasses two large geologic structures, the Moxa Arch and Rock Springs Uplift, which potentially are capable of storing commercial quantities of CO 2 in a number of formations, including the Nugget Sandstone, Tensleep/Weber Sandstone, Madison li mestone, and Bighorn Dolomite. The data suggest that except along the basin margins, the Tensleep/Weber, Madison, and Bighorn Formations are suitable targets under proposed federal and state geologic sequestration regulations. However, low total dissolved solids in Nugget Sandstone groundwater in parts of the Rock Springs Uplift suggest the potential for local, fracture-assisted recharge in this area. For this reason the Nugget Sandstone is less suitable than the deeper formations for CO 2 storage in the Rock Springs Uplift.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"93-111"},"PeriodicalIF":0.0,"publicationDate":"2010-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.93","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Cyberinfrastructure for collaborative geologic carbon sequestration research a conceptual model 协同地质固碳研究的网络基础设施概念模型
Rocky Mountain Geology Pub Date : 2010-09-01 DOI: 10.2113/GSROCKY.45.2.163
J. Hamerlinck, Teal B. Wyckoff, J. Oakleaf, P. Polzer
{"title":"Cyberinfrastructure for collaborative geologic carbon sequestration research a conceptual model","authors":"J. Hamerlinck, Teal B. Wyckoff, J. Oakleaf, P. Polzer","doi":"10.2113/GSROCKY.45.2.163","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.163","url":null,"abstract":"This paper describes the design and development of a conceptual framework for creating and implementing a cyberinfrastructure model to support interdisciplinary science associated with geologic carbon sequestration at the University of Wyoming. “Cyberinfrastructure” is a term increasingly used within the scientific community to represent information infrastructure networks connecting technology, data, and people to support research activities and the dissemination of its results. In this study, a cyberinfrastructure was designed for a multi-team, multi-task project case study centered on carbon sequestration research in the Moxa Arch, Wyoming. The design was based on a needs assessment conducted to identify information technology practices and requirements for each science team, resulting in a prototype carbon capture and storage knowledgebase workflow model. Major components of the workflow model include social networking functionality and geographic information system–based data management and visualization. The long-term goal of the effort is to build a cyberinfrastructure that fosters and enhances collaboration across research involved with geologic characterization, reservoir modeling, and long-term monitoring of geologic sequestration activities in Wyoming and throughout the Rocky Mountain Region.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"163-180"},"PeriodicalIF":0.0,"publicationDate":"2010-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.163","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On the development of a high-performance tool for the simulation of CO2 injection into deep saline aquifers 深部盐层CO2注入模拟高性能工具的研制
Rocky Mountain Geology Pub Date : 2010-09-01 DOI: 10.2113/GSROCKY.45.2.151
C. Douglas, F. Furtado, V. Ginting, M. Mendes, F. Pereira, M. Piri
{"title":"On the development of a high-performance tool for the simulation of CO2 injection into deep saline aquifers","authors":"C. Douglas, F. Furtado, V. Ginting, M. Mendes, F. Pereira, M. Piri","doi":"10.2113/GSROCKY.45.2.151","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.151","url":null,"abstract":"We report on the development of a multiscale parallel simulator for porous media flow problems. We combine state-of-the-art numerical techniques in a new object-oriented, high-performance simulation tool. The new multiscale parallel software will adapt itself to the type and number of available processing cores. The combination of: physically based operator splitting for multiscale time discretization of nonlinear systems of partial differential equations arising in multiphase flows in porous media, domain decomposition for the parallel solution of elliptic and parabolic problems, and semi-discrete central finite volume schemes for hyperbolic systems allows us to produce new very accurate simulations of multiphase flow in porous media problems that are of interest in many areas of science and technology, such as petroleum reservoir and environmental engineering. The new simulation code may aid the assessment and monitoring of CO 2 sequestration projects by providing accurate predictions of the migration and trapping of injected CO 2 plumes.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"151-161"},"PeriodicalIF":0.0,"publicationDate":"2010-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Stratigraphic evaluation of reservoir and seal in a natural CO2 field Lower Paleozoic, Moxa Arch, southwest Wyoming 怀俄明州西南部Moxa Arch下古生界天然CO2油田储层与封盖层地层学评价
Rocky Mountain Geology Pub Date : 2010-09-01 DOI: 10.2113/GSROCKY.45.2.113
R. Lynds, E. Campbell-Stone, T. P. Becker, C. Frost
{"title":"Stratigraphic evaluation of reservoir and seal in a natural CO2 field Lower Paleozoic, Moxa Arch, southwest Wyoming","authors":"R. Lynds, E. Campbell-Stone, T. P. Becker, C. Frost","doi":"10.2113/GSROCKY.45.2.113","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.2.113","url":null,"abstract":"The Moxa Arch in the Greater Green River Basin, southwestern Wyoming, hosts two potential reservoirs for CO2 sequestration. The Bighorn Dolomite and Madison Limestone are interpreted to be independent reservoirs based on differing CO2 compositions and production histories; the two reservoirs are separated by Devonian carbonates, siliciclastic rocks, and evaporites.\u0000\u0000On the Moxa Arch, the Bighorn ranges in thickness from 67 to 120 m with porosities from 3 to 15 percent. The massive buff-colored Steamboat Point Member comprises the bulk of the subsurface Bighorn in southwest Wyoming. Mottled dolostone (light-colored patches with higher porosity and dark-colored patches with lower porosity) is very common and is presumably the result of preferential early dolomitization of bioturbation. Core study suggests that this factor affects gas saturation and storage in this extensive reservoir.\u0000\u0000The Lower Member of the Jefferson Formation is the most probable seal within the Devonian stratigraphy. Strata of this member are interpreted to have been deposited in a shallow basin semi-isolated from the deeper marine environment to the west. 87Sr/86Sr isotopic analyses of anhydrite sampled from Moxa Arch well cuttings support the interpretation of a depositional environment exposed to a mixture of seawater and freshwater. High-frequency relative sea level fluctuations superimposed on a gently sloping shelf produced alternating layers of marine carbonates, peritidal siliciclastic rocks, and evaporites. The evaporites are interpreted to seal CO2 in the Bighorn Dolomite from the overlying Madison Limestone. The Lower Paleozoic strata on the Moxa Arch provide an effective trap-reservoir-seal combination for naturally occurring CO2 with potential applications to future studies at analogous locations in the central Rocky Mountain Region.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"113-132"},"PeriodicalIF":0.0,"publicationDate":"2010-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.2.113","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68309997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
U-Pb geochronology of Proterozoic granites in the Sawatch Range, central Colorado, U.S.A. 美国科罗拉多州中部萨沃奇山脉元古代花岗岩的U-Pb年代学
Rocky Mountain Geology Pub Date : 2010-03-20 DOI: 10.2113/GSROCKY.45.1.1
James V. Jones, S. Rogers, J. Connelly
{"title":"U-Pb geochronology of Proterozoic granites in the Sawatch Range, central Colorado, U.S.A.","authors":"James V. Jones, S. Rogers, J. Connelly","doi":"10.2113/GSROCKY.45.1.1","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.1.1","url":null,"abstract":"We report new U-Pb zircon ages for four previously undated Proterozoic granitoid intrusions exposed in the southern Sawatch Range, central Colorado. Coarse-grained to K-feldspar megacrystic granite (Henry Mountain granite) exposed along Taylor Canyon 20 km north of Gunnison, Colorado, crystallized at 1697 ± 7 Ma. It cuts across high-temperature deformational fabrics in metavolcanic and metasedimentary country rocks, thus bracketing at least one Paleoproterozoic tectonic event locally. This granite also contains a well-developed northeaststriking, subvertical foliation that postdates emplacement. The three other intrusions all yielded Mesoproterozoic ages. The Monarch Pass pluton, comprising coarse- to medium-grained granodiorite exposed 50 km east of Gunnison, crystallized at 1447 ± 9 Ma. It cuts across well-developed fabrics in metavolcanic host rocks and contains a widespread biotite foliation. Coarse-grained to K-feldspar megacrystic granite (Horsethief granite) exposed 5–10 km northwest of Taylor Park Reservoir was emplaced at 1437 ± 5 Ma, and it is locally deformed. Fine-grained, muscovite-biotite granite (Taylor River granite) that cuts across the southwestern part of the Henry Mountain pluton crystallized at 1428 ± 23 Ma. A subvertical, northeast-striking biotite foliation cuts across the contact between these two intrusions, suggesting that northwest-directed subhorizontal shortening occurred locally during the Mesoproterozoic. These ages provide new opportunities to constrain the age of tectonism in central Colorado and to further understand the Proterozoic tectonic evolution of southern Laurentia.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"45 1","pages":"1-22"},"PeriodicalIF":0.0,"publicationDate":"2010-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.1.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68310165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Is Stenomylus tubutamensis Ferrusquia-Villafranca 1990 a valid species? 管窄线虫是一个有效的物种吗?
Rocky Mountain Geology Pub Date : 2010-03-20 DOI: 10.2113/GSROCKY.45.1.35
Michael Cassiliano
{"title":"Is Stenomylus tubutamensis Ferrusquia-Villafranca 1990 a valid species?","authors":"Michael Cassiliano","doi":"10.2113/GSROCKY.45.1.35","DOIUrl":"https://doi.org/10.2113/GSROCKY.45.1.35","url":null,"abstract":"Stenomylus tubutamensis was reported as the smallest species of the genus by Ferrusquia-Villafranca (1990). Eight diagnostic characters, or groups of characters were listed as autapomorphies for S. tubutamensis . Three additional characters were shared with other species of Stenomylus . A re-analysis of S. tubutamensis was made by comparing its diagnostic characters to the same characters based on larger samples of other species of Stenomylus . The re-analysis shows that S. tubutamensis possesses one autapomorphy based on the original diagnostic characters. Nor does the S. tubutamensis possess a unique combination of characters. The study shows that many characters, especially raw dental metric characters, of the Stenomylinae are quite variable in their expression and can only be assessed by examination of means and ranges of variation based on large samples. The diagnosis of S. tubutamensis is revised. Relative to the other species of Stenomylus , S. tubutamensis is now diagnosed by the possession of the smallest upper canine, smallest P1, shortest average p1–p2 diastema, shortest average C–P1 diastema, shortest average p2–p3 diastema, and narrow, slit-like fossettids on the lower molars. The abandonment of the subgenera Stenomylus and Pegomylus is proposed.","PeriodicalId":34958,"journal":{"name":"Rocky Mountain Geology","volume":"16 1","pages":"35-57"},"PeriodicalIF":0.0,"publicationDate":"2010-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2113/GSROCKY.45.1.35","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68309782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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