Results 61 to 70 of about 3,414 (218)

Carbonate accumulation morphology in a soil chronosequence in the southern Pre-Ural, Russia: Significance for Holocene paleoenvironmental reconstruction

Revista Mexicana de Ciencias Geológicas, 2018
A chronosequence consisting of paleosols buried under kurgans of the Savromatian (2,500–2,600 yr BP) and the Late Sarmatian Time (1,700–1,800 yr BP), along with the modern Dark Kastanozems was studied in a dry steppe area of the southern Pre-Ural region,
Olga S. Khokhlova, Alsu M. Kouznetsova
doaj  

Using Terrestrial Organic Matter to Reconstruct the Stable Carbon Isotope Composition of the Atmosphere

Paleoceanography and Paleoclimatology, Volume 41, Issue 4, April 2026.
Abstract Carbon fluxes to Earth's atmosphere are reflected in the carbon isotope composition of atmospheric CO2 (δ13Catm). δ13Catm is used to track past changes to the global carbon cycle and is a variable in many paleoclimate proxies. However, existing δ13Catm proxy records derived from marine carbonates are relatively low‐resolution prior to the ...
Katarina A. Keating, Nathan D. Sheldon
wiley   +1 more source

The Franks Model CO2 Proxy: Do Assimilation Rate Values or Isotopic Corrections Optimize CO2 Reconstruction Accuracy?

Paleoceanography and Paleoclimatology, Volume 41, Issue 4, April 2026.
Abstract Paleo‐CO2 proxies are crucial for reconstructing past atmospheric CO2 variations and understanding their impact on Earth's climate, especially in light of anthropogenic climate change. The mechanistic leaf gas exchange model of Franks et al.
H. Morck, H. Teickner, K.‐H. Knorr, P. E. Jardine   +3 more
wiley   +1 more source

Response of Soils and Soil Ecosystems to the Pennsylvanian–Permian Climate Transition in the Upper Fluvial Plain of the Dunkard Basin, Southeastern Ohio, USA

Geosciences, 2018
Direct exposure of paleosols to the atmosphere during formation make them ideal for reconstructing paleoclimate. Paleosol and ichnofossil properties are dependently linked making it important to study them in tandem, to avoid errors in interpretation ...
Daniel I. Hembree, Jennifer L. Carnes
doaj   +1 more source

Depositional Facies, Sequence Stratigraphy, and Diagenesis of Lower Cretaceous Carbonate Reservoir, Southern Iraq: Implications for Petroleum Exploration

Journal of Petroleum Geology, Volume 49, Issue 2, Page 312-345, April 2026.
ABSTRACT The Lower Cretaceous Yamama Formation of southern Iraq represents a key carbonate reservoir within Iraq and the Middle East, yet its complex depositional facies architecture and diagenetic alterations present challenges for predicting reservoir quality.
A. K. A. Mohammed, F. Velledits, I. Q. Mohammed, M. Alsuwaidi, H. Mansurbeg, F. Kristály, D. K. Ivanova, Eloi González‐Esvertit, A. Awdal   +8 more
wiley   +1 more source

Constraints on Past CO2 and Climate Sensitivity From Global Temperature and Sea Level Reconstructions Across the Plio‐Pleistocene

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract In contrast to previous approaches, new reconstructions of changes in global mean surface temperature and global mean sea level (GMSL) include large variability in GMSL throughout the Pleistocene. Here we assess these reconstructions from an energy balance perspective by using them to force a global carbon cycle model in different scenarios ...
Peter Köhler, Peter U. Clark
wiley   +1 more source

Clay mineralogy of tephras and associated paleosols and soils, and hydrothermal deposits, North Island [New Zealand]

, 1993
Tour themes and itinerary The tour centres on the occurrence and genesis of clay minerals, especially allophane, halloysite, and ferrihydrite, associated with both Quaternary rhyolitic airfall tephra (volcanic ash) deposits and volcanogenic alluvium ...
Lowe, David J., Percival, H.J.
core  

Holocene Hydroclimatic Variations Over Western and Central Asia as Inferred From Speleothem Isotope Evidence

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.
Abstract Recent studies have found a dipole pattern of hydroclimate variation in western Asia (WA) and arid central Asia (ACA) during the Holocene. However, speleothem δ18O evidence shows some inconsistencies with other lines of evidence, especially concerning the timing of peak wetness in WA and precipitation trends in ACA.
Liang Ning, Fangmiao Xing, Zhengyu Liu, Jian Liu, Yanmin Qin, Qin Wen, Michael E. Mann, Yan Yu, Yongjin Wang, Mi Yan, Huayu Lu, Naixin Cao, Kefan Chen, Weiyi Sun   +13 more
wiley   +1 more source

Paleogeography of Accumulation of the Middle-Upper Permian Red Mudstones in the Kazan Volga Region [PDF]

Учёные записки Казанского университета: Серия Естественные науки, 2016
In this work we focus on sedimentology, mineralogy, grain size, and geochemistry of red mudstones of the Urzhumian (Wordian) and Severodvinian (Capitinian) reference section of the Monastyrskii ravine to specify their depositional settings and ...
F.A. Mouraviev, M.P. Arefiev, V.V. Silantiev, B.I. Gareev, G.A. Batalin, M.N. Urazaeva, T.V. Kropotova, I.B. Vybornova   +7 more
doaj  

New partial skeleton of Homo habilis from the upper Burgi Member, Koobi Fora Formation, Ileret, Kenya

The Anatomical Record, Volume 309, Issue 3, Page 485-545, March 2026.
Abstract KNM‐ER 64061 is a partial skeleton from the upper Burgi Member of the Koobi Fora Formation (2.02–2.06 Ma) associated taphonomically and geochemically with a nearly complete mandibular dentition (KNM‐ER 64060) attributed to Homo habilis.
Frederick E. Grine, Deming Yang, Ashley S. Hammond, William L. Jungers, Michael R. Lague, Carrie S. Mongle, Osbjorn M. Pearson, Meave G. Leakey, Louise N. Leakey   +8 more
wiley   +1 more source