Proceedings Volume: "Evaluating How Continental Sedimentary Basins Fill: Development and Preservation of Sedimentary Successions", New Mexico Geological Society, 2012 Annual Spring Meeting最新文献

{"title":"Large-volume Quaternary travertine deposits in the Rio Grande rift and Jemez lineament, New Mexico and Arizona: Implications for paleoclimate, landscape evolution, and neotectonics","authors":"A. Priewisch, L. Crossey, E. Embid, K. Karlstrom, V. Polyak, Y. Asmerom, J. Ricketts, A. Nereson","doi":"10.56577/sm-2012.173","DOIUrl":"https://doi.org/10.56577/sm-2012.173","url":null,"abstract":"","PeriodicalId":240412,"journal":{"name":"Proceedings Volume: \"Evaluating How Continental Sedimentary Basins Fill: Development and Preservation of Sedimentary Successions\", New Mexico Geological Society, 2012 Annual Spring Meeting","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132909381","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":"Revision of Redondasaurus (Archosauria: Parasuchidae) from the Upper Triassic (Apachean) of the American southwest","authors":"J. Spielmann, S. Lucas","doi":"10.56577/sm-2012.195","DOIUrl":"https://doi.org/10.56577/sm-2012.195","url":null,"abstract":"A recent restudy of Apachean-age phytosaurs, primarily from the Chinle Group of the American Southwest, has allowed for the recognition of at least six new skulls of the Apachean Redondasaurus, which when added to previously known cranial material, brings the total number of recognized Redondasaurus skulls to ~ 12. With this larger sample size, new taxonomically informative characters have been recognized that further distinguish Redondasaurus from closely-related phytosaur taxa (e.g., Pseudopalatus, Nicrosaurus). The primary diagnostic character of Redondasaurus has traditionally been supratemporal fenestrae that are hidden in dorsal view. However, now, with a greater sampling of skull characters, the following features are also recognized as diagnostic of Redondasaurus: reduced antorbital fenestrae; a prominent pre-infratemporal shelf at the anteroventral margin of the lateral temporal fenestra; septomaxillae that wrap around the outer margin of the external narial opening; a thickened orbital margin (distinguishing it from all other phytosaur except Coburgosuchus); and an inflated posterior nasal behind the external narial opening. Based on these newly recognized diagnostic characters Redondasaurus is demonstrably distinct from Pseudopalatus and arguments for their synonymy should be abandoned. Further, we interpret Redondasaurus as sexually dimorphic, with the males possessing an overall more robust skull with a crest that extends the length of the snout and females with a more gracile skull that lacks a crest, analogous to the sexual dimorphs recognized in Pseudopalatus. Given the sexual dimorphism in Redondasaurus, the two named species should be synonymized, as the only difference between the two species were sexually dimorphic characters of the crest. Thus, the holotype of Redondasaurus gregorii is the female morph and the holotype of R. bermani is the male morph. Given R. gregorii’s priority, R. bermani should be treated as a junior subjective synonym. The newly recognized diagnostic characters of Redondasaurus will hopefully allow additional specimens to be identified and increase the biostratigraphic utility of this taxon.","PeriodicalId":240412,"journal":{"name":"Proceedings Volume: \"Evaluating How Continental Sedimentary Basins Fill: Development and Preservation of Sedimentary Successions\", New Mexico Geological Society, 2012 Annual Spring Meeting","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133983880","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":"An unusually large metaposaurid from the Salitral Formation of the Chinle Group (Upper Triassic: Carnian?) on lands belonging to the Pueblo of Jemez","authors":"K. Madalena, K. Zeigler, S. Sumida","doi":"10.56577/sm-2012.182","DOIUrl":"https://doi.org/10.56577/sm-2012.182","url":null,"abstract":"Lands belonging to the Pueblo of Jemez in north-central New Mexico include sedimentary strata that range in age from Mississippian to Pleistocene, and include excellent exposures of Upper Triassic strata. The Salitral Formation of the lower Chinle Group (Upper Triassic: Carnian) are present in the southeastern corner of the Jemez Reservation in an area that is complexly faulted. Samples for paleomagnetic analyses have been taken from the area in order to clarify the stratigraphic relationships and are currently in progress. Material pertaining to a metoposaurid amphibian was recovered from a grayish-purple calcrete nodule horizon in the lower Salitral Formation, approximately 7-8 m above the underlying Shinarump (=Agua Zarca) Formation. The fossil-bearing horizon is comprised primarily of a poorly consolidated conglomeratic lens dominated by calcareous nodules from 1-10 cm diameter. This unit also contains moderately abundant fragments of metoposaur and phytosaur material. Metoposaurid material includes cranial and shoulder girdle elements as well as teeth. Phytosaur material includes teeth and osteoderms with a characteristically high dorsal ridge. The metoposaurid specimens are fragmentary, but are significant for their extraordinary size. A partial interclavicle is conservatively reconstructed as well over 450 cm in width. The largest specimen reported from Texas is 430 cm, and a specimen previously reported as the largest from New Mexico is 400 cm in width. Published sizes of metoposaurid interclavicles from the Chinle Formation of New Mexico and the Dockum Formation of West Texas average 307 m and 313 cm respectively. Thus, the Jemez metoposaur is one of the largest ever reported, approximately 47-48% larger than those published averages, and approximately 5% larger than the largest one yet reported. Although measurements of the thickness of dermal elements of the pectoral girdle are not commonly available, the Jemez metoposaur also appears remarkable in this regard, measuring over 2.5 cm from deep to superficial surfaces.","PeriodicalId":240412,"journal":{"name":"Proceedings Volume: \"Evaluating How Continental Sedimentary Basins Fill: Development and Preservation of Sedimentary Successions\", New Mexico Geological Society, 2012 Annual Spring Meeting","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115735218","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":"Complex sediment preservation and removal in the northern and central Tularosa Basin, New Mexico, due to deflation, base level changes, down-wind accumulations, and recycling","authors":"D. Love, B. Allen, D. Koning","doi":"10.56577/sm-2012.157","DOIUrl":"https://doi.org/10.56577/sm-2012.157","url":null,"abstract":"On the floor of the Tularosa Basin, deflation has repeatedly controlled local base levels and related eolian, playa, and alluvial geomorphic features, with eolian sediment being an important contributor to aggradation on eastern basin margins. Modern surface water transports fine sediment and dissolved salts to the lowest parts of the basin in deflated, non-integrated playas such as modern Lake Lucero (base elevation 1,183 m, 44 m below the drainage divide to the south). Shallow ground water controls depths of deflation which in turn determine local base levels. Deflation basins scoured and partially filled episodically, so alluvial terraces are preserved at several intermediate levels between the maximum level of basin fill and present streams. At one of these levels (locally ~17 m below the level of maximum fill; 2-11 m above Salt Creek) an inactive gypsum-marsh deposit covers >50 km 2. Radiocarbon ages of 10,900 to 10,300 yr bracket as much as 1.5 m of gypsum-marsh deposition. At least two intermediate levels of terrace-alluvium lie between the marsh and the level of maximum basin fill. Three levels of Holocene alluvium are inset below the marsh, reflecting short-term aggradation between deflation episodes and erosion by Salt Creek. During Holocene time, between the San Andres Mountain front and Alkali Flat, alluvial-fan drainages that had been graded to the edge of Pleistocene Lake Otero cut downward and planed laterally following 20 m of base-level fall during lake-bed deflation. Deflated sediment was transported primarily to the northeast. Lunette dunes formed immediately downwind of many blowout areas; White Sands dune field accumulated beyond Lake Lucero and Alkali Flat. Farther downwind, clay- to sand-size gypsum episodically formed broad sheets. An unknown (presumably large) component of clay- to-fine sand, including gypsum, is (and was) carried eastward to the alluvial fans and slopes of the Sacramento Mountains. Holocene runoff has reworked components of that sediment back onto the alluvial fans. Most late Quaternary sediment preservation is on the eastern and western alluvial fans, in the proximal hanging walls of active normal faults, but episodic deflation precludes long-term sediment preservation in the basin center.","PeriodicalId":240412,"journal":{"name":"Proceedings Volume: \"Evaluating How Continental Sedimentary Basins Fill: Development and Preservation of Sedimentary Successions\", New Mexico Geological Society, 2012 Annual Spring Meeting","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128609770","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":"Geothermal exploration of the Winston Graben, central New Mexico","authors":"M. Sophy, S. Kelley","doi":"10.56577/sm-2012.170","DOIUrl":"https://doi.org/10.56577/sm-2012.170","url":null,"abstract":"","PeriodicalId":240412,"journal":{"name":"Proceedings Volume: \"Evaluating How Continental Sedimentary Basins Fill: Development and Preservation of Sedimentary Successions\", New Mexico Geological Society, 2012 Annual Spring Meeting","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130263952","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 results from a late Pleistocene to Holocene paleoclimate study of the lake sediment cores, northern New Mexico","authors":"D. Cedillo, A. R. Brister, C. A. Lopresti, M. Maldonado, R. Pitrucha, C. West, E. Martinez, J. Lineline, M. Petronis","doi":"10.56577/sm-2012.172","DOIUrl":"https://doi.org/10.56577/sm-2012.172","url":null,"abstract":"The geography of the Las Vegas National Wildlife Refuge (LVNWR) and surrounding region has changed dramatically since the late Pleistocene in response to the expansion and contraction of alpine glaciers activity and associated climate change. During the late Pleistocene, we hypothesize that the area just east of the Sangre de Cristo Mountains at the latitude of Las Vegas, NM consisted of several or a network of interconnected lacustrine systems. Following the end of glacial activity, these lacustrine systems shrank to their current condition of minor low-volume isolated lakes and numerous playas and pluvial bodies. Preliminary data from an integrated, paleoclimatic study of sediment cores collected from three playa lakes provide insight into late Pleistocene to Holocene paleoclimatic variations in northeastern NM. Sedimentologic, midge fossil, and rock magnetic data acquired from the sediment cores is used to characterize the materials, identify stratigraphic changes, document shifting lake levels, assess temperature changes, and infer paleoclimate conditions. Data collected from McAllister and Wallace Lake are encouraging and reveal depth dependent changes in fossil assemblages, grain size, and rock magnetic properties that have been interpret to reflect climatic driven variations impacting the depositional system. Bulk low-field magnetic susceptibility decreases by an order of magnitude from the surface to the base of the measured core suggesting a change in detrital magnetic influx into the lacustrian system. Curie point estimates indicate that the dominant magnetic mineral in all samples is cubic, low-Ti titanomagnetite phase. An environmental magnetism study of sediment from the LVNWR and surrounding plays can help provide invaluable and untapped record of late Pleistocene to Holocene climatic change. Additional data are being collected which will aid with interpreting the evolution of the lacustrine system. We postulate that concurrent with alpine glacial activity during the Pleistocene, the LVNWR and the transitional Great Plains region to the northeast was an expansive single lake or interconnected lake system, analogous to the Pleistocene lakes of the Estancia Basin (Lake Estancia) and the Tularosa Basin (Lake Otero) of central and southern NM.","PeriodicalId":240412,"journal":{"name":"Proceedings Volume: \"Evaluating How Continental Sedimentary Basins Fill: Development and Preservation of Sedimentary Successions\", New Mexico Geological Society, 2012 Annual Spring Meeting","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134048251","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}