{"title":"In Memoriam - Frank Titus 1928-2013","authors":"B. Thomson","doi":"10.58799/nmg-v36n2.42","DOIUrl":"https://doi.org/10.58799/nmg-v36n2.42","url":null,"abstract":"","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71175978","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}
This paper presents the results of an aquifer characterization study in east-central Union County, New Mexico . The Ogallala Formation and upper Dakota Formation together vary from zero to several hundred feet in thickness and form a complex unconfined aquifer . Confinement increases with depth in the lower Dakota Formation and underlying formations . Shale layers form leaky confining beds . Water level and saturated thickness declines from the mid 1950s to the present have been significant, and large portions of the Ogallala–Dakota aquifer have been dewatered . Water levels in deep wells largely recover after irrigation season ends, but the recoveries are superimposed on a long-term declining water-level trend . Tritium and 14C analyses from groundwater samples indicate that there is no significant recharge occurring to the sampled zones of the aquifer, consistent with the ongoing water level declines . Seepage velocity calculations are consistent with a recharge model in which the groundwater was recharged thousands of years ago, tens of kilometers west of the study area, by rapid infiltration of playa lake waters and of precipitation on porous volcanic features, lava flows, and exposed bedrock of aquifer units .
{"title":"Hydrogeology of eastern Union County, northeast New Mexico","authors":"G. Rawling","doi":"10.58799/nmg-v36n4.64","DOIUrl":"https://doi.org/10.58799/nmg-v36n4.64","url":null,"abstract":"This paper presents the results of an aquifer characterization study in east-central Union County, New Mexico . The Ogallala Formation and upper Dakota Formation together vary from zero to several hundred feet in thickness and form a complex unconfined aquifer . Confinement increases with depth in the lower Dakota Formation and underlying formations . Shale layers form leaky confining beds . Water level and saturated thickness declines from the mid 1950s to the present have been significant, and large portions of the Ogallala–Dakota aquifer have been dewatered . Water levels in deep wells largely recover after irrigation season ends, but the recoveries are superimposed on a long-term declining water-level trend . Tritium and 14C analyses from groundwater samples indicate that there is no significant recharge occurring to the sampled zones of the aquifer, consistent with the ongoing water level declines . Seepage velocity calculations are consistent with a recharge model in which the groundwater was recharged thousands of years ago, tens of kilometers west of the study area, by rapid infiltration of playa lake waters and of precipitation on porous volcanic features, lava flows, and exposed bedrock of aquifer units .","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71176199","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 96-m-thick, mixed siliciclastic-carbonate interval spanning the boundary between the lower and middle members of the lower Permian (Wolfcampian) Hueco Formation in the southeastern Robledo Mountains, New Mexico, contains depth-sensitive lithofacies that allow delineation of sea-level cycles on the Robledo Shelf. Carbonate lithofacies include (1) fenestral dolomudstone (supratidal to high intertidal), (2) peloidal dolomudstone (low intertidal to lagoon), (3) foram packstone and grainstone (restricted marine), (4) intraclast, fossiliferous grainstone (tidal channel), and (5) fossiliferous packstone (open marine), whereas (6) shale (offshore marine) constitutes the only siliciclastic lithofacies. The presence of both siliciclastic and carbonate lithofacies may be related to sea-level change but may also have been influenced by paleoclimate, with carbonate sediment deposited during more arid periods and siliciclastic sediment deposited during more humid periods. Compared to the remainder of the Hueco Formation, the Robledo Shelf experienced more restricted marine conditions, was shallower, and was not traversed by rivers during deposition of the lower-middle Hueco transition. Several scales of sea-level cyclicity are present within the lower-middle Hueco transition, including decimeter-to meter-scale upwardshallowing parasequences, decimeter- to meter-scale sequences primarily represented by interbeds of carbonate and shale, and meter- to dekameter-scale composite megasequences composed of deeper-water sets of sequences overlain by shallower-water sets of sequences. A rough estimate of the average duration of the sequences is about 87 k.y., which is consistent with a glacial-eustatic origin. The average duration of the composite megasequences (about 600 k.y.), however, is longer than the longest glacial-eustatic cycle (about 400 k.y.), suggesting the possible role of non glacial eustacy and/or tectonic subsidence as controlling factors.
{"title":"Sequence stratigraphy of the lower-middle Hueco transition interval (lower Permian, Wolfcampian), Robledo Mountains, New Mexico","authors":"G. Mack, K. Giles, C. Durr","doi":"10.58799/nmg-v35n2.27","DOIUrl":"https://doi.org/10.58799/nmg-v35n2.27","url":null,"abstract":"A 96-m-thick, mixed siliciclastic-carbonate interval spanning the boundary between the lower and middle members of the lower Permian (Wolfcampian) Hueco Formation in the southeastern Robledo Mountains, New Mexico, contains depth-sensitive lithofacies that allow delineation of sea-level cycles on the Robledo Shelf. Carbonate lithofacies include (1) fenestral dolomudstone (supratidal to high intertidal), (2) peloidal dolomudstone (low intertidal to lagoon), (3) foram packstone and grainstone (restricted marine), (4) intraclast, fossiliferous grainstone (tidal channel), and (5) fossiliferous packstone (open marine), whereas (6) shale (offshore marine) constitutes the only siliciclastic lithofacies. The presence of both siliciclastic and carbonate lithofacies may be related to sea-level change but may also have been influenced by paleoclimate, with carbonate sediment deposited during more arid periods and siliciclastic sediment deposited during more humid periods. Compared to the remainder of the Hueco Formation, the Robledo Shelf experienced more restricted marine conditions, was shallower, and was not traversed by rivers during deposition of the lower-middle Hueco transition. Several scales of sea-level cyclicity are present within the lower-middle Hueco transition, including decimeter-to meter-scale upwardshallowing parasequences, decimeter- to meter-scale sequences primarily represented by interbeds of carbonate and shale, and meter- to dekameter-scale composite megasequences composed of deeper-water sets of sequences overlain by shallower-water sets of sequences. A rough estimate of the average duration of the sequences is about 87 k.y., which is consistent with a glacial-eustatic origin. The average duration of the composite megasequences (about 600 k.y.), however, is longer than the longest glacial-eustatic cycle (about 400 k.y.), suggesting the possible role of non glacial eustacy and/or tectonic subsidence as controlling factors.","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71175600","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":"Gallery of Geology - An unusual nautloid from the Pennsylvanian of New Mexico","authors":"B. Kues","doi":"10.58799/nmg-v35n4.103","DOIUrl":"https://doi.org/10.58799/nmg-v35n4.103","url":null,"abstract":"","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71175779","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 time-term method of analyzing seismic refraction data was used to process 62 time-distance pairs observed on a 13 station seismic network from 10 shot points in and around Albuquerque Basin, New Mexico. The time terms derived from the analysis range from 1.50 seconds at the Albuquerque volcanoes down to -.047 seconds at the Albuquerque Seismological Laboratory. In a general way the time terms correlate with the geologic foundation beneath the site: Large values are calculated for stations and shots within the basin, intermediate values on consolidated sedimentary rocks and Tertiary intrusions, and the smallest on Precambrian outcrops. The P-wave (Pg) velocity in bedrock was found to be 6.0 ± .02 km/s. This falls approximately midway between higher velocities reported to the east and west of Albuquerque Basin and lower velocities reported to the north and south. These numbers will be valuable in future efforts to accurately locate shallow nearby earthquakes and for studies seeking to unravel seismic complexities deeper in the crust.
{"title":"P-wave velocity in Precambrian basement (Pg) and P-wave time terms in and around Albuquerque Basin, New Mexico","authors":"L. Jaksha","doi":"10.58799/nmg-v35n4.95","DOIUrl":"https://doi.org/10.58799/nmg-v35n4.95","url":null,"abstract":"A time-term method of analyzing seismic refraction data was used to process 62 time-distance pairs observed on a 13 station seismic network from 10 shot points in and around Albuquerque Basin, New Mexico. The time terms derived from the analysis range from 1.50 seconds at the Albuquerque volcanoes down to -.047 seconds at the Albuquerque Seismological Laboratory. In a general way the time terms correlate with the geologic foundation beneath the site: Large values are calculated for stations and shots within the basin, intermediate values on consolidated sedimentary rocks and Tertiary intrusions, and the smallest on Precambrian outcrops. The P-wave (Pg) velocity in bedrock was found to be 6.0 ± .02 km/s. This falls approximately midway between higher velocities reported to the east and west of Albuquerque Basin and lower velocities reported to the north and south. These numbers will be valuable in future efforts to accurately locate shallow nearby earthquakes and for studies seeking to unravel seismic complexities deeper in the crust.","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71175963","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}
The distinctive rock types and faunas of the Juana Lopez Member of the Mancos Shale of the San Juan Basin can be recognized to the southeast in Socorro, Lincoln, and Otero Counties, New Mexico. Consequently, this lithostratigraphic name is extended formally into central New Mexico, where it is used as a bed-rank unit within the D-Cross Tongue of the Mancos Shale. The Juana Lopez Beds of the D-Cross Tongue of the Mancos Shale in central New Mexico consist of thin calcarenites and sandstones interbedded with thicker, noncalcareous shales as much as 21.4 ft (6.5 m) thick. Just as in the San Juan Basin, the base of the Juana Lopez Beds can lie in the middle Turonian Prionocyclus macombi Zone and its top, in the upper Turonian P. novimexicanus Zone. However, the unit is less than half as thick in central New Mexico as it is in the San Juan Basin, suggesting it is condensed to the southeast. Reduced thicknesses in units below and within the Juana Lopez Member and Beds suggest erosional unconformities throughout its geographic extent in New Mexico. The most distinctive fossil in the Juana Lopez is the small, ribbed oyster Cameleolopha lugubris (Conrad 1857), which is abundant in the basal part of the unit. The chronostratigraphy of the upper and lower contacts of the Juana Lopez in 11 outcrop sections extending from Mesa Verde National Park, Colorado, to northwest Otero County, New Mexico, indicate that neither contact represents a regional isochronous surface. An assemblage of three ammonite and two bivalve species from near the base of the Juana Lopez at four localities in New Mexico may provide the biostratigraphic resolution required for isochroneity. This assemblage includes the Boreal species Prionocyclus macombi, Coilopoceras inflatum, Inoceramus dimidius, and Cameleolopha lugubris along with the distinctive Tethyan ammonite Hourcquia mirabilis, described originally from Madagascar. However, this assemblage occurs in only three of the 11 profiled outcrop sections, although it is also known from the base of the Juana Lopez Member of the Carlile Shale in northeastern New Mexico.
{"title":"The Upper Cretaceous (Turonian) Juana Lopez Beds of the D-Cross Tongue of the Mancos Shale in central New Mexico and their relationship to the Juana Lopez Member of the Mancos Shale in the San Juan Basin","authors":"S. Hook, W. A. Cobban","doi":"10.58799/nmg-v35n3.59","DOIUrl":"https://doi.org/10.58799/nmg-v35n3.59","url":null,"abstract":"The distinctive rock types and faunas of the Juana Lopez Member of the Mancos Shale of the San Juan Basin can be recognized to the southeast in Socorro, Lincoln, and Otero Counties, New Mexico. Consequently, this lithostratigraphic name is extended formally into central New Mexico, where it is used as a bed-rank unit within the D-Cross Tongue of the Mancos Shale. The Juana Lopez Beds of the D-Cross Tongue of the Mancos Shale in central New Mexico consist of thin calcarenites and sandstones interbedded with thicker, noncalcareous shales as much as 21.4 ft (6.5 m) thick. Just as in the San Juan Basin, the base of the Juana Lopez Beds can lie in the middle Turonian Prionocyclus macombi Zone and its top, in the upper Turonian P. novimexicanus Zone. However, the unit is less than half as thick in central New Mexico as it is in the San Juan Basin, suggesting it is condensed to the southeast. Reduced thicknesses in units below and within the Juana Lopez Member and Beds suggest erosional unconformities throughout its geographic extent in New Mexico. The most distinctive fossil in the Juana Lopez is the small, ribbed oyster Cameleolopha lugubris (Conrad 1857), which is abundant in the basal part of the unit. The chronostratigraphy of the upper and lower contacts of the Juana Lopez in 11 outcrop sections extending from Mesa Verde National Park, Colorado, to northwest Otero County, New Mexico, indicate that neither contact represents a regional isochronous surface. An assemblage of three ammonite and two bivalve species from near the base of the Juana Lopez at four localities in New Mexico may provide the biostratigraphic resolution required for isochroneity. This assemblage includes the Boreal species Prionocyclus macombi, Coilopoceras inflatum, Inoceramus dimidius, and Cameleolopha lugubris along with the distinctive Tethyan ammonite Hourcquia mirabilis, described originally from Madagascar. However, this assemblage occurs in only three of the 11 profiled outcrop sections, although it is also known from the base of the Juana Lopez Member of the Carlile Shale in northeastern New Mexico.","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71175725","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. Hook, W. A. Cobban, White Oaks Canyon, L. Vegas
Rudistids are uncommon fossils in Upper Cretaceous rocks of the Western Interior of the United States. Since 1856 there have been fewer than 40 occurrences noted in the literature, many of these without descriptions or illustrations. Only six of these occurrences are from New Mexico. Therefore, the discovery of two fragments of solitary radiolitid rudistids and one fragment of a small bouquet from a sandy concretionary bed in the lower tongue of Mancos Shale in Lincoln County, New Mexico, is of some importance. Associated fossils in the concretions include the ammonites Spathites rioensis, Morrowites depressus, and Collignoniceras woollgari woollgari, placing the rudistid bed in the lower part of the middle Turonian C. woollgari Zone. Although specifically indeterminate, the rudistids are probably conspecific with a large rudistid bouquet composed of Durania cornupastoris that was described and illustrated from rocks in the same zone in the Greenhorn Limestone of Colorado.
在美国西部内陆的上白垩纪岩石中，粗鲁的化石是罕见的。自1856年以来，文献中记载的这种现象不到40次，其中许多都没有描述或插图。其中只有6起发生在新墨西哥州。因此，在新墨西哥州林肯县曼科斯页岩下舌的砂质结核层中发现的两个单独的放射性石质rudistids碎片和一个小花束碎片具有一定的重要性。结露中伴生化石包括鹦鹉石Spathites rioensis、Morrowites depressus和Collignoniceras woollgari woollgari，表明该芦石层位于中Turonian C. woollgari带的下部。虽然具体不确定，但这些粗石科植物可能与一束由杜鹃花组成的粗石科植物同属，这束植物是在科罗拉多州绿角石灰岩的同一区域的岩石中描述和说明的。
{"title":"Middle Turonian (Late Cretaceous) rudistids from the lower tongue of the Mancos Shale, Lincoln County, New Mexico","authors":"S. Hook, W. A. Cobban, White Oaks Canyon, L. Vegas","doi":"10.58799/nmg-v35n1.13","DOIUrl":"https://doi.org/10.58799/nmg-v35n1.13","url":null,"abstract":"Rudistids are uncommon fossils in Upper Cretaceous rocks of the Western Interior of the United States. Since 1856 there have been fewer than 40 occurrences noted in the literature, many of these without descriptions or illustrations. Only six of these occurrences are from New Mexico. Therefore, the discovery of two fragments of solitary radiolitid rudistids and one fragment of a small bouquet from a sandy concretionary bed in the lower tongue of Mancos Shale in Lincoln County, New Mexico, is of some importance. Associated fossils in the concretions include the ammonites Spathites rioensis, Morrowites depressus, and Collignoniceras woollgari woollgari, placing the rudistid bed in the lower part of the middle Turonian C. woollgari Zone. Although specifically indeterminate, the rudistids are probably conspecific with a large rudistid bouquet composed of Durania cornupastoris that was described and illustrated from rocks in the same zone in the Greenhorn Limestone of Colorado.","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71175859","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}
The earliest documented records of large earthquakes in New Mexico go back to the early 1900s, and seismicity has been monitored instrumentally since the early 1960s. This catalog is a continuation of previous catalogs spanning 1962 through 2004 and includes 165 earthquakes Md ≥ 2.0. In addition it also includes all located events with Md ≥ 0 in New Mexico. Similar to the 1999– 2004 catalog, we found that a large number of earthquakes Md ≥ 2.0 were located in two distinct regions. One of these regions is in southeastern New Mexico near the Dagger Draw oil field (32% of all events with Md ≥ 2.0), and the other is in northeastern New Mexico within and surrounding the coalbed methane fields near Raton (44% of all events with Md ≥ 2.0). Only 5% of the larger earthquakes occurred in the Socorro Seismic Anomaly region. The remaining events were scattered throughout New Mexico, southeastern Colorado, eastern Arizona, northern Mexico, and western Texas.
{"title":"Earthquake catalogs for New Mexico and bordering areas: 2005-2009","authors":"Jana Pursley, S. Bilek, C. Ruhl","doi":"10.58799/nmg-v35n1.3","DOIUrl":"https://doi.org/10.58799/nmg-v35n1.3","url":null,"abstract":"The earliest documented records of large earthquakes in New Mexico go back to the early 1900s, and seismicity has been monitored instrumentally since the early 1960s. This catalog is a continuation of previous catalogs spanning 1962 through 2004 and includes 165 earthquakes Md ≥ 2.0. In addition it also includes all located events with Md ≥ 0 in New Mexico. Similar to the 1999– 2004 catalog, we found that a large number of earthquakes Md ≥ 2.0 were located in two distinct regions. One of these regions is in southeastern New Mexico near the Dagger Draw oil field (32% of all events with Md ≥ 2.0), and the other is in northeastern New Mexico within and surrounding the coalbed methane fields near Raton (44% of all events with Md ≥ 2.0). Only 5% of the larger earthquakes occurred in the Socorro Seismic Anomaly region. The remaining events were scattered throughout New Mexico, southeastern Colorado, eastern Arizona, northern Mexico, and western Texas.","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71175559","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}
One of the most visually distinctive outcrops of sedimentary rock in New Mexico is located in Socorro County, a few kilometers northwest of Carthage, at Cañon Agua Buena. Strata of the Chinle Group, of Late Triassic age, crop out in the ravines here and are assigned primarily to the San Pedro Arroyo Formation, a unit of mudstone, limestone, and sandstone that overlies sandstone and conglomerate of the Shinarump Formation, with the limestones concentrated in the Ojo Huelos Member. Lucas (1991) first named this unit and established the type section in southern Valencia County at Ojo Huelos (Lucas 1991; Lucas et al. 2004). The Ojo Huelos Member is a persistent, distinctive marker unit throughout the Upper Triassic section in both Valencia and Socorro Counties, from Hubbell Springs near Belen and Carrizo Arroyo in the Lucero uplift to its southernmost outcrops near Carthage (Lucas 1991; Lucas et al. 2004; Cather and Osburn 2007; Spielmann and Lucas 2009; Tanner and Lucas 2012). The member consists mainly of micritic lime mudstone, ostracode-bearing wackestone to grainstone, peloidal grainstone, and distinctive pisolitic rudstone, interbedded with fine-grained siliciclastic mudstone. The age of
新墨西哥州最具视觉特色的沉积岩露头之一位于索科罗县，在迦太基西北几公里处，Cañon Agua Buena。晚三叠世Chinle群的地层在这里的峡谷中生长，主要属于圣佩德罗阿罗约组，这是一个泥岩、石灰石和砂岩的单元，覆盖在Shinarump组的砂岩和砾岩上，石灰石集中在Ojo Huelos段。Lucas(1991)首先命名了这个单元，并在Ojo Huelos的瓦伦西亚县南部建立了类型剖面(Lucas 1991;Lucas et al. 2004)。Ojo Huelos段是贯穿瓦伦西亚和索科罗县上三叠统剖面的一个持久的、独特的标志单元，从靠近贝伦的Hubbell Springs和Lucero隆起的Carrizo Arroyo到靠近Carthage的最南端露头(Lucas 1991;Lucas et al. 2004;Cather and Osburn 2007;斯皮尔曼和卢卡斯2009;Tanner and Lucas 2012)。该段主要由泥晶灰岩、介形虫砂粒岩、球粒粒岩和独特的泥质砂岩组成，与细粒硅质泥岩互层。的时代
{"title":"Gallery of Geology - Late Triassic pisolites in Socorro County, New Mexico","authors":"L. Tanner, S. Lucas","doi":"10.58799/nmg-v35n1.21","DOIUrl":"https://doi.org/10.58799/nmg-v35n1.21","url":null,"abstract":"One of the most visually distinctive outcrops of sedimentary rock in New Mexico is located in Socorro County, a few kilometers northwest of Carthage, at Cañon Agua Buena. Strata of the Chinle Group, of Late Triassic age, crop out in the ravines here and are assigned primarily to the San Pedro Arroyo Formation, a unit of mudstone, limestone, and sandstone that overlies sandstone and conglomerate of the Shinarump Formation, with the limestones concentrated in the Ojo Huelos Member. Lucas (1991) first named this unit and established the type section in southern Valencia County at Ojo Huelos (Lucas 1991; Lucas et al. 2004). The Ojo Huelos Member is a persistent, distinctive marker unit throughout the Upper Triassic section in both Valencia and Socorro Counties, from Hubbell Springs near Belen and Carrizo Arroyo in the Lucero uplift to its southernmost outcrops near Carthage (Lucas 1991; Lucas et al. 2004; Cather and Osburn 2007; Spielmann and Lucas 2009; Tanner and Lucas 2012). The member consists mainly of micritic lime mudstone, ostracode-bearing wackestone to grainstone, peloidal grainstone, and distinctive pisolitic rudstone, interbedded with fine-grained siliciclastic mudstone. The age of","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71175484","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}
The first part of this contribution, presented in the February 2012 issue of New Mexico Geology, laid the groundwork for an exploration of what geologists knew or surmised about the geology of New Mexico as the territory transitioned into statehood in 1912. Part 1 included an overview of the demographic, economic, social, cultural, and technological attributes of New Mexico and its people a century ago, and a discussion of important individuals, institutions, and areas and methods of research—the geologic environment, so to speak—that existed in the new state at that time.
{"title":"The geology of New Mexico as understood in 1912: an essay for the centennial of New Mexico statehood: Part 2","authors":"B. Kues","doi":"10.58799/nmg-v34n2.27","DOIUrl":"https://doi.org/10.58799/nmg-v34n2.27","url":null,"abstract":"The first part of this contribution, presented in the February 2012 issue of New Mexico Geology, laid the groundwork for an exploration of what geologists knew or surmised about the geology of New Mexico as the territory transitioned into statehood in 1912. Part 1 included an overview of the demographic, economic, social, cultural, and technological attributes of New Mexico and its people a century ago, and a discussion of important individuals, institutions, and areas and methods of research—the geologic environment, so to speak—that existed in the new state at that time.","PeriodicalId":35824,"journal":{"name":"New Mexico Geology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71175162","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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