Results 41 to 50 of about 178 (157)

Smithian–Spathian carbonate geochemistry in the northern Thaynes Group influenced by multiple styles of diagenesis

The Depositional Record, Volume 11, Issue 2, Page 616-636, April 2025.
While the Smithian–Spathian boundary carbon isotopic excursion has been traditionally interpreted as capturing global carbon cycle behaviour, recent studies have suggested that at least some Early Triassic carbon isotopic excursions may incorporate influences from authigenic or early diagenetic processes.
Jordan P. Todes, Franziska R. Blattmann, Torsten Vennemann, Elke Schneebeli‐Hermann, Hugo Bucher, Dan P. Razionale, Clara L. Blättler   +6 more
wiley   +1 more source

Palynostratigraphy, Paleoenvironments and Kerogen Evaluation of the Campanian-Maastrichtian Enugu Shale, Anambra Basin, Nigeria

Fountain Journal of Natural and Applied Sciences (FUJNAS), 2020
Palynological and palynofacies analyses were used to investigate the paleoenvironments and hydrocarbon potential of the Campanian-Maastrichtian Enugu Shale, Anambra Basin, Nigeria.
M. A. Olayiwola, E. U. Durugbo, O. T. Fajemila   +2 more
doaj   +3 more sources

Climato-chronostratigraphic framework of Pleistocene terrestrial and marine deposits of Northern Eurasia, based on pollen, electron spin resonance, and infrared optically stimulated luminescence analyses [PDF]

Estonian Journal of Earth Sciences, 2010
Marine and terrestrial records spanning the Brunhes Chron (0–780 000 years) were synthesized using data from palaeoshelf, glacial, periglacial, and extraglacial zones of Northern Eurasia.
Molodkov, Anatoly, Bolikhovskaya, Nataliya   +1 more
doaj  

The Silent VOICE—Searching for Geochemical Markers to Track the Impact of Late Jurassic Rift Tectonics

Geochemistry, Geophysics, Geosystems, Volume 25, Issue 10, October 2024.
Abstract A causal mechanism for the Volgian Isotopic Carbon Excursion (VOICE) remains enigmatic. Elemental geochemical profiles of the Deer Bay Formation, Sverdrup Basin, Arctic Canada that record the VOICE and contemporaneous strata are herein examined to provide insight into depositional environments during Late Jurassic‐Early Cretaceous time. Silver
Jennifer M. Galloway, Thomas Hadlari, Keith Dewing, Terence Poulton, Stephen E. Grasby, Lutz Reinhardt, Mikhail Rogov, Jack Longman, Madeleine Vickers   +8 more
wiley   +1 more source

The Jurassic of Denmark and Greenland: Palynostratigraphy and palaeoenvironment of the Middle Jurassic Sortehat Formation (Neill Klinter Group), Jameson Land, East Greenland [PDF]

Geological Survey of Denmark and Greenland Bulletin, 2003
The grey–black mudstones of the Sortehat Formation form part of the Middle Jurassic fill of the Jameson Land Basin in East Greenland. The formation is exposed in the southernmost part of the north–south-trending, Mesozoic rift system in East Greenland ...
Koppelhus, Eva B., Hansen, Carina F.
doaj  

Boreal waterways: An Early Cretaceous plesiosaur from Ellesmere Island, Nunavut, Canadian Arctic and its palaeobiogeography [PDF]

Acta Palaeontologica Polonica
A plesiosaur specimen collected from Ellesmere Island (Nunavut, Arctic Canada) by Danish geologist Johannes Troelsen in 1952 is described for the first time. The plesiosaur is late Berriasian to early Valanginian in age based on palynostratigraphy.
Lene L. Delsett, Adam S. Smith, Stephen Ingrams, Simon Schneider   +3 more
doaj   +1 more source

Summer temperatures from the Middle Pleistocene site Schöningen 13 II, northern Germany, determined from subfossil chironomid assemblages

Boreas, Volume 53, Issue 4, Page 525-542, October 2024.
The manuscript presents the first subfossil chironomid record from the 300 000‐year‐old Reinsdorf sequence of the well‐known archaeological site Schöningen 13 II. We tested two geographically diverse recent chironomid–temperature calibration datasets for German lowland lake sediments and reconstructed summer air temperatures based on subfossil ...
Sonja Rigterink, Kim J. Krahn, Bartosz Kotrys, Brigitte Urban, Oliver Heiri, Falko Turner, Andre Pannes, Antje Schwalb   +7 more
wiley   +1 more source

Middle Jurassic sandstone deposition in the Wandel Sea Basin: evidence from cardioceratid and kosmoceratid ammonites in the Mågensfjeld Formation in Kilen, North Greenland

GEUS Bulletin, 2020
Age assessments from both palynostratigraphy and macrofossil biostratigraphy of the sandstone-dominated Mågensfjeld Formation, Wandel Sea Basin, North Greenland were hitherto hampered by post-burial thermal degradation of dinoflagellate cysts and a lack ...
Peter Alsen, Jussi Hovikoski, Kristian Svennevig   +2 more
doaj   +1 more source

Biomarker Reconstruction of a High‐Latitude Late Paleocene to Early Eocene Coal Swamp Environment Across the PETM and ETM‐2 (Ellesmere Island, Arctic Canada)

Paleoceanography and Paleoclimatology, Volume 39, Issue 2, February 2024.
Abstract The Paleocene‐Eocene Thermal Maximum (PETM) and early Eocene hyperthermal events were characterized by a Hothouse climate state. Our understanding of the climatic impact of these hyperthermals is currently biased toward marine settings and the mid‐latitudes.
Martin Blumenberg, B. David A. Naafs, Andreas Lückge, Vittoria Lauretano, Enno Schefuß, Jennifer M. Galloway, Georg Scheeder, Lutz Reinhardt   +7 more
wiley   +1 more source

Palynostratigraphy as an alternative for absolute short-lived isotopes dating: revised chronology of Krzywce Wielkie littoral cores

Acta Palaeobotanica
Five sediment cores were collected from Lake Krzywce Wielkie (‘Bory Tucholskie’ National Park) to reconstruct macrophytes succession: four from the littoral zone (35 cm) and one from deep water.
Grzegorz Kowalewski
doaj   +1 more source