{"title":"ASPECT RELATED MICROCLIMATE’S EFFECTS ON SOIL-FORMING PROCESSES, HILLSLOPE EVOLUTION, AND VEGETATION DISTRIBUTION IN A SEMIARID WATERSHED, SEVILLETA NATIONAL WILDLIFE REFUGE, NEW MEXICO","authors":"Devin G. Gaugler","doi":"10.56577/sm-2008.877","DOIUrl":"https://doi.org/10.56577/sm-2008.877","url":null,"abstract":"","PeriodicalId":435999,"journal":{"name":"New Mexico Geological Society, 2008 Annual Spring Meeting, Proceedings Volume","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126410925","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}
A. Fargo, W. Mcintosh, W. Mcintosh, N. Dunbar, N. Dunbar
The history and chronology of the Minna Bluff volcanic peninsula provides insight into past dynamics of the Ross Ice Sheet. Twenty-five samples of volcanic rock from different elevations on Minna Bluff have been dated using Ar/Ar geochronology. When volcanoes interact with glacial ice the resulting lithofacies can provide useful information on ice thickness that can be used to interpret ice-sheet history. Datable volcanic rocks that bracket obvious glacial unconformities also provide information about glacial history. This information can be combined with data from the ANDRILL marine core to help determine ice-sheet chronology for the Miocene in the McMurdo Sound region. Prior K/Ar dating of the southeastern exposures at Minna Bluff yielded dates ranging from 11 to 7.26 Ma and suggested that the southern tip of the bluff represents the oldest eruptions. New Ar/Ar results from sanidine and amphibole mineral separates and groundmass concentrates, show older ages of 11.67 ± 0.19 Ma in the northern end of Minna Hook (the eastern end of the 50 km long bluff) and the youngest age of 8.28 ± 0.17 Ma from one of the stratigraphically highest lava domes on Minna Hook. A prominent glacial unconformity, which probably represents either over riding by the Ross Ice-Sheet or formation of localized glaciers on the bluff, separates the lower volcanic section (dominated by basanite flows and breccias) from the central volcanic section (dominated by trachyte domes and secondary basanite flows). Multiple pairs of samples were collected from both above and below this unconformity in order to best constrain the period of glacial erosion. The youngest age from beneath the unconformity is 9.74 ± 0.07 Ma and the oldest age above the unconformity is 9.53 ± 0.07 Ma. This leaves between 350,000 and 70,000 years (allowing for errors at two sigma) for the glacial erosion to have taken place.
{"title":"40AR/39AR GEOCHRONOLOGICAL ANALYSIS OF MINNA BLUFF, ANTARCTICA: EVIDENCE FOR PAST GLACIAL EVENTS WITHIN THE ANTARCTIC CRYOSPHERE","authors":"A. Fargo, W. Mcintosh, W. Mcintosh, N. Dunbar, N. Dunbar","doi":"10.56577/sm-2008.874","DOIUrl":"https://doi.org/10.56577/sm-2008.874","url":null,"abstract":"The history and chronology of the Minna Bluff volcanic peninsula provides insight into past dynamics of the Ross Ice Sheet. Twenty-five samples of volcanic rock from different elevations on Minna Bluff have been dated using Ar/Ar geochronology. When volcanoes interact with glacial ice the resulting lithofacies can provide useful information on ice thickness that can be used to interpret ice-sheet history. Datable volcanic rocks that bracket obvious glacial unconformities also provide information about glacial history. This information can be combined with data from the ANDRILL marine core to help determine ice-sheet chronology for the Miocene in the McMurdo Sound region. Prior K/Ar dating of the southeastern exposures at Minna Bluff yielded dates ranging from 11 to 7.26 Ma and suggested that the southern tip of the bluff represents the oldest eruptions. New Ar/Ar results from sanidine and amphibole mineral separates and groundmass concentrates, show older ages of 11.67 ± 0.19 Ma in the northern end of Minna Hook (the eastern end of the 50 km long bluff) and the youngest age of 8.28 ± 0.17 Ma from one of the stratigraphically highest lava domes on Minna Hook. A prominent glacial unconformity, which probably represents either over riding by the Ross Ice-Sheet or formation of localized glaciers on the bluff, separates the lower volcanic section (dominated by basanite flows and breccias) from the central volcanic section (dominated by trachyte domes and secondary basanite flows). Multiple pairs of samples were collected from both above and below this unconformity in order to best constrain the period of glacial erosion. The youngest age from beneath the unconformity is 9.74 ± 0.07 Ma and the oldest age above the unconformity is 9.53 ± 0.07 Ma. This leaves between 350,000 and 70,000 years (allowing for errors at two sigma) for the glacial erosion to have taken place.","PeriodicalId":435999,"journal":{"name":"New Mexico Geological Society, 2008 Annual Spring Meeting, Proceedings Volume","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121415406","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}
{"title":"SINKHOLES IN SOUTHEAST NEW MEXICO – PROFILING THE GEOCHEMICAL, HYDROLOGICAL AND MICROBIAL CHARACTER OF SINKS ALONG THE PECOS RIVER AT BITTER LAKE NWR, ROSWELL, NM","authors":"Z. E. Premo, L. Crossey","doi":"10.56577/sm-2008.894","DOIUrl":"https://doi.org/10.56577/sm-2008.894","url":null,"abstract":"","PeriodicalId":435999,"journal":{"name":"New Mexico Geological Society, 2008 Annual Spring Meeting, Proceedings Volume","volume":"1977 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125096194","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}
{"title":"TRIASSIC STRATIGRAPHY SOUTH OF LAMY, NEW MEXICO","authors":"J. Spielmann, J. Spielmann, S. Lucas","doi":"10.56577/sm-2008.906","DOIUrl":"https://doi.org/10.56577/sm-2008.906","url":null,"abstract":"","PeriodicalId":435999,"journal":{"name":"New Mexico Geological Society, 2008 Annual Spring Meeting, Proceedings Volume","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133769608","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}
At the reference section of the Juana Lopez Member of the Mancos Shale near La Ventana in central New Mexico, the unit is thick and well exposed. In 1966, Dane and others reported a reference section of 107 ft thick, the same thickness as the type section at Galisteo Dam. The Juana Lopez consists of three lithic intervals--lower calcarenites, middle shale and upper calcarenites, and is underlain by the Carlile Member of the Mancos Shale. Only the upper part of the Carlile Member is exposed at La Ventana, and the Semilla Sandstone Member is very thin. The ammonite fauna from the Carlile and Semilla includes Prionocyclus hyatti (Stanton), Coilopoceras springeri Hyatt, Romaniceras (Romaniceras) mexicanum Jones and Placenticeras cumminsi Cragin. The ammonite fauna from the Juana Lopez includes Scaphites whitfieldi Cobban, Prionocyclus novimexicanus (Marcou), Prionocyclus macombi Meek, Coilopoceras colleti Hyatt and Baculites sp. Ammonite diversity in the upper calcarenite interval of the Juana Lopez is lower than at the type section. It includes primarily P. novimexicanus , secondarily S. whitfieldi , and rarely Baculites sp. The middle shale interval, as at the type section, has a low diversity ammonite fauna dominated by P. macombi with an occasional C. colleti. The P. hyatti Zone, present in the Carlile Member at La Ventana, also occurs in other places in New Mexico, especially in the Carlile Member at Galisteo Dam. The P. macombi and P. novimexicanus zones are present in the Juana Lopez Member
{"title":"TURONIAN AMMONITES FROM THE UPPER CRETACEOUS CARLILE AND SEMILLA SANDSTONE MEMBERS AND REFERENCE AREA OF THE JUANA LOPEZ MEMBER OF THE MANCOS SHALE, EASTERN SIDE OF THE SAN JUAN BASIN, LA VENTANA, SANDOVAL COUNTY, NEW MEXICO","authors":"P. Sealey, S. Lucas","doi":"10.56577/sm-2008.900","DOIUrl":"https://doi.org/10.56577/sm-2008.900","url":null,"abstract":"At the reference section of the Juana Lopez Member of the Mancos Shale near La Ventana in central New Mexico, the unit is thick and well exposed. In 1966, Dane and others reported a reference section of 107 ft thick, the same thickness as the type section at Galisteo Dam. The Juana Lopez consists of three lithic intervals--lower calcarenites, middle shale and upper calcarenites, and is underlain by the Carlile Member of the Mancos Shale. Only the upper part of the Carlile Member is exposed at La Ventana, and the Semilla Sandstone Member is very thin. The ammonite fauna from the Carlile and Semilla includes Prionocyclus hyatti (Stanton), Coilopoceras springeri Hyatt, Romaniceras (Romaniceras) mexicanum Jones and Placenticeras cumminsi Cragin. The ammonite fauna from the Juana Lopez includes Scaphites whitfieldi Cobban, Prionocyclus novimexicanus (Marcou), Prionocyclus macombi Meek, Coilopoceras colleti Hyatt and Baculites sp. Ammonite diversity in the upper calcarenite interval of the Juana Lopez is lower than at the type section. It includes primarily P. novimexicanus , secondarily S. whitfieldi , and rarely Baculites sp. The middle shale interval, as at the type section, has a low diversity ammonite fauna dominated by P. macombi with an occasional C. colleti. The P. hyatti Zone, present in the Carlile Member at La Ventana, also occurs in other places in New Mexico, especially in the Carlile Member at Galisteo Dam. The P. macombi and P. novimexicanus zones are present in the Juana Lopez Member","PeriodicalId":435999,"journal":{"name":"New Mexico Geological Society, 2008 Annual Spring Meeting, Proceedings Volume","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116803682","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}
{"title":"CONDUCTIVE HEAT FLUX OVER SELECTED GEOTHERMAL SYSTEMS IN THE RIO GRANDE RIFT AND ADJACENT AREAS SUGGESTS A PROCESS OF SHALLOW HYDROTHERMAL SYSTEM SIZE SCALING","authors":"J. Witcher","doi":"10.56577/sm-2008.913","DOIUrl":"https://doi.org/10.56577/sm-2008.913","url":null,"abstract":"","PeriodicalId":435999,"journal":{"name":"New Mexico Geological Society, 2008 Annual Spring Meeting, Proceedings Volume","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132871738","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}
S. Kelley, K. Kempter, F. Maldonado, G. Smith, S. Connell, D. Koning
{"title":"STRATIGRAPHY AND TECTONIC IMPLICATIONS OF OLIGOCENE TO EARLY MIOCENE SEDIMENTATION IN THE JEMEZ MOUNTAINS, NORTH-CENTRAL NEW MEXICO","authors":"S. Kelley, K. Kempter, F. Maldonado, G. Smith, S. Connell, D. Koning","doi":"10.56577/sm-2008.882","DOIUrl":"https://doi.org/10.56577/sm-2008.882","url":null,"abstract":"","PeriodicalId":435999,"journal":{"name":"New Mexico Geological Society, 2008 Annual Spring Meeting, Proceedings Volume","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124340074","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}
{"title":"PRELIMINARY INTERPETATION OF SIX YEARS OF TILTMETER MOTIONS ABOVE THE FLANKS OF THE SOCORRO MAGMA BODY, CENTRAL RIO GRANDE RIFT","authors":"D. W. Love, B. Allen, R. Chamberlin, W. Haneberg","doi":"10.56577/sm-2008.886","DOIUrl":"https://doi.org/10.56577/sm-2008.886","url":null,"abstract":"","PeriodicalId":435999,"journal":{"name":"New Mexico Geological Society, 2008 Annual Spring Meeting, Proceedings Volume","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115526981","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}
{"title":"MALPAIS SPRING AND MALPAIS SALT MARSH, NORTHERN TULAROSA BASIN, NEW MEXICO","authors":"R. Myers, B. Allen, D. W. Love","doi":"10.56577/sm-2008.893","DOIUrl":"https://doi.org/10.56577/sm-2008.893","url":null,"abstract":"","PeriodicalId":435999,"journal":{"name":"New Mexico Geological Society, 2008 Annual Spring Meeting, Proceedings Volume","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114186040","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}
J. Spielmann, J. McDonnell, Dick Traeger, J. Spielmann, S. Lucas, A. Heckert, P. Hester
Rousseau was one of the most important invertebrate paleontologists in the history of New Mexico geology. His prolific collecting and publishing established four orders, approximately 100 genera and over 400 species of invertebrates, most of them cephalopods. Many of his specimens were collected from BLM-administrated lands in New Mexico and Texas. The extensive collection produced by Flower is one of the most important records of Paleozoic invertebrates in the country. ~10,000 locality
{"title":"THE ROUSSEAU H. FLOWER INVERTEBRATE FOSSIL COLLECTION: CONSERVATION AND CURATION","authors":"J. Spielmann, J. McDonnell, Dick Traeger, J. Spielmann, S. Lucas, A. Heckert, P. Hester","doi":"10.56577/sm-2008.905","DOIUrl":"https://doi.org/10.56577/sm-2008.905","url":null,"abstract":"Rousseau was one of the most important invertebrate paleontologists in the history of New Mexico geology. His prolific collecting and publishing established four orders, approximately 100 genera and over 400 species of invertebrates, most of them cephalopods. Many of his specimens were collected from BLM-administrated lands in New Mexico and Texas. The extensive collection produced by Flower is one of the most important records of Paleozoic invertebrates in the country. ~10,000 locality","PeriodicalId":435999,"journal":{"name":"New Mexico Geological Society, 2008 Annual Spring Meeting, Proceedings Volume","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126839792","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}
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