Greg A. Ludvigson
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View article: Volcanogenic zircon geochronology from paleosols in Cenozoic terrestrial strata
Volcanogenic zircon geochronology from paleosols in Cenozoic terrestrial strata Open
View article: The Onset of Summer Drought on the Iberian Peninsula Following Pliocene Global Cooling
The Onset of Summer Drought on the Iberian Peninsula Following Pliocene Global Cooling Open
The highly biodiverse Iberian Peninsula has winter‐dominated precipitation and summer drought. The onset of this modern climate regime, termed a Mediterranean‐Type Climate, began during the Late Pliocene–Early Pleistocene, concurrent with …
View article: Paleosol Geochronometry Using Volcanogenic Zircons: A Case Study from the Late Miocene Ogallala Formation in the Central Great Plains, USA
Paleosol Geochronometry Using Volcanogenic Zircons: A Case Study from the Late Miocene Ogallala Formation in the Central Great Plains, USA Open
View article: Integrated geochronological and chemostratigraphic study of middle Miocene strata (Ogallala Group) at the eastern margin of the North American Great Plains
Integrated geochronological and chemostratigraphic study of middle Miocene strata (Ogallala Group) at the eastern margin of the North American Great Plains Open
Global and regional shifts in climate and environmental conditions during the Miocene gradually gave rise to the grassland biomes that now dominate the modern North American Great Plains. Strata comprising the Ogallala Group provide critic…
View article: U‐Pb Geochronology of Paleosol Carbonate Cements by LA‐ICP‐MS: A Proof of Concept and Strategy for Dating the Terrestrial Record
U‐Pb Geochronology of Paleosol Carbonate Cements by LA‐ICP‐MS: A Proof of Concept and Strategy for Dating the Terrestrial Record Open
This study investigates the potential of laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) U‐Pb dating for carbonate nodules in the Late Triassic Ischigualasto Formation of northwestern Argentina. We establish a fully…
View article: Carbonate Stable Isotope Data Suggest Freshwater Environment for the McMurray Formation (Aptian), Alberta, Canada
Carbonate Stable Isotope Data Suggest Freshwater Environment for the McMurray Formation (Aptian), Alberta, Canada Open
Stable isotope, trace element, and cathodoluminescence analyses were performed on gastropods and matrix from rock cores of the Middle to Upper McMurray Formation (Lower Cretaceous/Aptian, Northwestern Alberta, Canada) to characterize the e…
View article: Comment on gchron-2024-7
Comment on gchron-2024-7 Open
Abstract. A promising primary reference material for U-Pb LA-ICP-MS carbonate dating is analysed and reported here. The new RM is a botryoidal cement (C1) from sample RA138. The sample was collected in outcrop strata of mi…
View article: Exploring the Deuterium Excess of Cretaceous Arctic Paleoprecipitation Using Stable Isotope Composition of Clay Minerals from the Prince Creek Formation (Maastrichtian) in Northern Alaska
Exploring the Deuterium Excess of Cretaceous Arctic Paleoprecipitation Using Stable Isotope Composition of Clay Minerals from the Prince Creek Formation (Maastrichtian) in Northern Alaska Open
We report estimated stable isotope compositions of Artic paleoprecipitation using phyllosilicates sampled from three paleosols and two bentonites in the Prince Creek Formation (Maastrichtian) in northern Alaska. Previous studies reported a…
View article: Ibex Hollow Tuff from ca. 12 Ma supereruption, southern Idaho, identified across North America, eastern Pacific Ocean, and Gulf of Mexico
Ibex Hollow Tuff from ca. 12 Ma supereruption, southern Idaho, identified across North America, eastern Pacific Ocean, and Gulf of Mexico Open
The Ibex Hollow Tuff, 12.08 ± 0.03 Ma (40Ar/39Ar), is a widespread tephra layer erupted from the Bruneau-Jarbidge volcanic field of southern Idaho. Tephra from this eruption was deposited across much of western and central North America an…
View article: Using the factors of soil formation to assess stable carbon isotope disequilibrium in late Pleistocene (MIS 3) buried soils of the Great Plains, North America
Using the factors of soil formation to assess stable carbon isotope disequilibrium in late Pleistocene (MIS 3) buried soils of the Great Plains, North America Open
The stable carbon isotope composition of both soil organic matter (SOM) and pedogenic carbonate are widely used as paleoenvironmental proxies. This study utilizes δ13C analyses to reconstruct bioclimatic change from a series of buried soil…
View article: Revision to Nomenclature of the Zarah Subgroup of the Kansas City Group (Pennsylvanian) in Kansas
Revision to Nomenclature of the Zarah Subgroup of the Kansas City Group (Pennsylvanian) in Kansas Open
This paper provides a summary review of proposed nomenclatural revisions to the Zarah Subgroup of the Kansas City Group (Pennsylvanian) in Kansas and outlines changes adopted by the Kansas Geological Survey. The Iola Limestone, which compr…
View article: U–Pb Geochronology and Stable Isotope Geochemistry of Terrestrial Carbonates, Lower Cretaceous Cedar Mountain Formation, Utah: Implications for Synchronicity of Terrestrial and Marine Carbon Isotope Excursions
U–Pb Geochronology and Stable Isotope Geochemistry of Terrestrial Carbonates, Lower Cretaceous Cedar Mountain Formation, Utah: Implications for Synchronicity of Terrestrial and Marine Carbon Isotope Excursions Open
The terrestrial Lower Cretaceous Cedar Mountain Formation, Utah, is a critical archive of paleoclimate, tectonics, and vertebrate ecology and evolution. Early Cretaceous carbon cycle perturbations associated with ocean anoxia have been int…
View article: Stable Isotope Tracers of Cretaceous Arctic Paleoprecipitation
Stable Isotope Tracers of Cretaceous Arctic Paleoprecipitation Open
We report estimated stable isotope compositions of depositional waters and paleoprecipitation from the Cretaceous Arctic to further elucidate the role of the global hydrologic cycle in sustaining polar warmth during that period. Estimates …
View article: Differentiating early from later diagenesis in a Cretaceous sandstone and petroleum reservoir of the Cedar Mountain Formation, Utah
Differentiating early from later diagenesis in a Cretaceous sandstone and petroleum reservoir of the Cedar Mountain Formation, Utah Open
Previously published anomalous whole-rock stable isotopic values from the Poison Strip Sandstone Member of the Cretaceous Cedar Mountain Formation (CMF) of eastern Utah are of uncertain origins. This study investigated the diagenetic histo…
View article: Peer Review #1 of "Age constraint for the Moreno Hill Formation (Zuni Basin) by CA-TIMS and LA-ICP-MS detrital zircon geochronology (v0.1)"
Peer Review #1 of "Age constraint for the Moreno Hill Formation (Zuni Basin) by CA-TIMS and LA-ICP-MS detrital zircon geochronology (v0.1)" Open
The "mid-Cretaceous" (~ 125 -80 Ma) was punctuated by major plate-tectonic upheavals resulting in widespread volcanism, mountain-building, eustatic sea-level changes, and climatic shifts that together had a profound impact on terrestrial b…
View article: Multi-proxy strategy for determining palaeoclimate parameters in the Ruby Ranch Member of the Cedar Mountain Formation
Multi-proxy strategy for determining palaeoclimate parameters in the Ruby Ranch Member of the Cedar Mountain Formation Open
Supplementary figure 3: Clumped isotope averages
View article: Multi-proxy strategy for determining palaeoclimate parameters in the Ruby Ranch Member of the Cedar Mountain Formation
Multi-proxy strategy for determining palaeoclimate parameters in the Ruby Ranch Member of the Cedar Mountain Formation Open
Supplementary figure 2: All samples gases
View article: Assessing Stable Carbon Isotope Disequilibrium in Late Pleistocene Buried Soils of the Great Plains, USA, Using a State Factor Approach
Assessing Stable Carbon Isotope Disequilibrium in Late Pleistocene Buried Soils of the Great Plains, USA, Using a State Factor Approach Open
View article: Multi-proxy strategy for determining palaeoclimate parameters in the Ruby Ranch Member of the Cedar Mountain Formation
Multi-proxy strategy for determining palaeoclimate parameters in the Ruby Ranch Member of the Cedar Mountain Formation Open
Supplementary figure 1: Bulk geochemistry
View article: Multi-proxy strategy for determining palaeoclimate parameters in the Ruby Ranch Member of the Cedar Mountain Formation
Multi-proxy strategy for determining palaeoclimate parameters in the Ruby Ranch Member of the Cedar Mountain Formation Open
A multiproxy approach for evaluating palaeoclimate parameters in deep-time can result in improvements to inter-related factors affecting palaeohydrology. Here we utilize diverse geochemical tools to improve palaeoclimate estimates for the …
View article: Chronostratigraphy and terrestrial palaeoclimatology of Berriasian–Hauterivian strata of the Cedar Mountain Formation, Utah, USA
Chronostratigraphy and terrestrial palaeoclimatology of Berriasian–Hauterivian strata of the Cedar Mountain Formation, Utah, USA Open
A supplementary data table summarising LA-ICP-MS U-Pb data on a 50 zircon from sample PSMA 11.71 (data sorted by ascending 206Pb/238U age)
View article: Mississippian Stratigraphic Nomenclature Revisions in Kansas
Mississippian Stratigraphic Nomenclature Revisions in Kansas Open
This paper reviews proposed Mississippian nomenclature changes in Kansas and outlines the changes to Zeller (1968) that have been adopted by the Kansas Geological Survey. The Sedalia Dolomite is changed to the Sedalia Formation and the Nor…
View article: Changes in CO2 during Ocean Anoxic Event 1d indicate similarities to other carbon cycle perturbations
Changes in CO2 during Ocean Anoxic Event 1d indicate similarities to other carbon cycle perturbations Open
View article: Mississippian Stratigraphic Nomenclature Revisions in Kansas
Mississippian Stratigraphic Nomenclature Revisions in Kansas Open
This paper reviews proposed Mississippian nomenclature changes in Kansas and outlines the changes to Zeller (1968) that have been adopted by the Kansas Geological Survey. The Sedalia Dolomite is changed to the Sedalia Formation and the Nor…
View article: Quaternary Stratigraphy and Stratigraphic Nomenclature Revisions in Kansas
Quaternary Stratigraphy and Stratigraphic Nomenclature Revisions in Kansas Open
This paper outlines Quaternary nomenclature changes to Zeller (1968) that have been adopted by the Kansas Geological Survey (KGS). The KGS formally recognizes two series/epochs for the Quaternary: the Holocene and Pleistocene. Pleistocene …
View article: Quaternary Stratigraphy and Stratigraphic Nomenclature Revisions in Kansas
Quaternary Stratigraphy and Stratigraphic Nomenclature Revisions in Kansas Open
This paper outlines Quaternary nomenclature changes to Zeller (1968) that have been adopted by the Kansas Geological Survey (KGS). The KGS formally recognizes two series/epochs for the Quaternary: the Holocene and Pleistocene. Pleistocene …
View article: Use of multiple oxygen isotope proxies for elucidating Arctic Cretaceous palaeo-hydrology
Use of multiple oxygen isotope proxies for elucidating Arctic Cretaceous palaeo-hydrology Open
Stable oxygen isotope analysis of siderite and dinosaur tooth enamel phosphate from the Campanian–Maastrichtian Prince Creek Formation, Alaska, USA, are analysed to determine the palaeohydrology of the ancient Colville Basin north of the A…
View article: SPATIAL AND TEMPORAL PATTERNS OF OGALLALA FORMATION DEPOSITION REVEALED BY U-PB ZIRCON GEOCHRONOLOGY
SPATIAL AND TEMPORAL PATTERNS OF OGALLALA FORMATION DEPOSITION REVEALED BY U-PB ZIRCON GEOCHRONOLOGY Open
Difficulties in correlation within continental clastic basins arise from the common shortage of reliable marker beds, which limits characterization of geological relationships. In the High Plains of the central United States, an improved u…
View article: Enigmatic Red Beds Exposed at Point of Rocks, Cimarron National Grassland, Morton County, Kansas
Enigmatic Red Beds Exposed at Point of Rocks, Cimarron National Grassland, Morton County, Kansas Open
Point of Rocks, a high-relief bluff overlooking the Cimarron River valley in Morton County, Kansas, is capped by distinct white beds of Neogene Ogallala Formation calcrete that overlie red beds of shale, siltstone, and sandstone. These unf…
View article: Isotopic Composition of the Ogallala-high Plains Aquifer Andvadose Zone
Isotopic Composition of the Ogallala-high Plains Aquifer Andvadose Zone Open
The Ogallala-High Plains aquifer is an important resource for irrigated agriculture in a semi-arid region of the United States. Steep declines in groundwater levels are putting increasing strain on the viability of the aquifer for irrigati…