Results 71 to 80 of about 8,217 (293)

Trans-Atlantic application of the Baltic Middle and Upper Ordovician carbon isotope zonation [PDF]

Estonian Journal of Earth Sciences, 2015
Application of the recently introduced Baltic d13C isotope zonation to a composite North American Darriwilian through Hirnantian succession shows that in most intervals there is good trans-Atlantic agreement not only between the isotope zones but also ...
Stig M. Bergström, Matthew R. Saltzman, Stephen A. Leslie, Annalisa Ferretti, Seth A. Young   +4 more
doaj   +1 more source

Correlated chemostratigraphy of Mn-carbonate microbialites (Úrkút, Hungary) [PDF]

Gondwana Research, 2016
Abstract The genesis of a suite of Jurassic (Lias) microbialites at the Urkut black shale-hosted manganese carbonate ore body (central Hungary) is described by a two-step microbial formation model that uses mineral chemistry combined with whole-profile (up section) textural context and sulfur isotopic compositions of associated pyrite and barite ...
Polgári Márta Piroska, Németh Tibor, Pál-Molnár Elemér, Futó István, Vigh Tamás, Mojzsis Stephen, James   +5 more
openaire   +2 more sources

Fine‐scale chemostratigraphy of cross‐sectioned hydrogenous ferromanganese nodules from the western North Pacific

Island Arc, 2021
A broad area densely covered by ferromanganese nodules was recently discovered around Minamitorishima (Marcus) Island, representing a high‐potential metal resource, particularly for Co, Ni, Mo, and W.
S. Machida, Kentaro Nakamura, T. Kogiso, Ryotaro Shimomura, Koichi Horinouchi, K. Okino, Y. Kato   +6 more
semanticscholar   +1 more source

Sedimentation and subsidence history of the Lomonosov Ridge [PDF]

, 2006
During the first scientific ocean drilling expedition to the Arctic Ocean (Arctic Coring Expedition [ACEX]; Integrated Ocean Drilling Program Expedition 302), four sites were drilled and cored atop the central part of the Lomonosov Ridge in the Arctic ...
Backman, J., Brinkhuis, H., Clemens, S., Cronin, T., Dickens, G.R., Eynaud, F., Gattacceca, J., Jakobsson, M., Jordan, R.W., Kaminski, M., King, J., Koç, N., Martinez, N.C., Matthiessen, J., McInroy, D., Moore Jr., T.C., Moore, T.C., Moran, K., O'Regan, M., Onodera, J., Pälike, H., Rea, B., Rio, D., Sakamoto, T., Smith, D.C., St. John, K.E.K., Stein, R., Suto, I., Suzuki, N., Takahashi, K., Watanabe, M., Yamamoto, M.   +31 more
core   +3 more sources

Late Triassic to Early Jurassic carbon isotope chemostratigraphy and organo-facies evolution in a distal to proximal transect of the North German Basin

International journal of earth sciences
Throughout the Latest Triassic and the Early Jurassic, major changes in paleogeography, climate and eustatic sea-level impacted on the development of shelf depositional environments. Secular trends in environmental conditions were punctuated by transient
W. Ruebsam, Matthias Franz, Jörg Ansorge, K. Obst, L. Schwark   +4 more
semanticscholar   +1 more source

The Chemostratigraphy of the Murray Formation and Role of Diagenesis at Vera Rubin Ridge in Gale Crater, Mars, as Observed by the ChemCam Instrument

Journal of Geophysical Research: Planets, 2020
Geochemical results are presented from Curiosity's exploration of Vera Rubin ridge (VRR), in addition to the full chemostratigraphy of the predominantly lacustrine mudstone Murray formation up to and including VRR.

semanticscholar   +1 more source

A Stratified Redox Model for the Ediacaran Ocean [PDF]

, 2010
The Ediacaran Period (635 to 542 million years ago) was a time of fundamental environmental and evolutionary change, culminating in the first appearance of macroscopic animals.
Chu, Xuelei, Fike, David A., Li, Chao, Love, Gordon D., Lyons, Timothy W., Sessions, Alex L.   +5 more
core   +1 more source

Linking palaeo‐wildfire to depositional environmental and ecological dynamics of an Early–Middle Pennsylvanian fluvial‐tidal transition zone—Palynology and pyrolysis evidence

The Depositional Record, Volume 12, Issue 1, February 2026.
The Pennsylvanian landscape in the Forest City basin was characterised by low‐lying lycopod tree and fern swamp forests with persistently high groundwater tables and adjacent fluvial channel, floodplain and upland environments. The occurrence of abundant charcoal within a specific thin interval in the Cherokee Group indicates substantial wildfire ...
Dustin Northrup, Emily Finzel, Pierre Zippi, Kevin Bohacs   +3 more
wiley   +1 more source

The age of the Tojeira Formation (Late Jurassic, Early Kimmeridgian), of Montejunto, west-central Portugal [PDF]

, 2017
Precise biostratigraphic dating of the Tojeira Formation (Late Jurassic, Early Kimmeridgian) of the Montejunto section of west-central Portugal, which has yielded important planktonic foraminiferal assemblages, is hindered by poor preservation in the ...
Gale, Andy S., Gradstein, Felix M., Turner, Holly E., Watkins, David K.   +3 more
core   +1 more source

Fluvial deposits of the Ahr river (western Germany) reveal recurring high‐magnitude flood events over the last 1,500 years

Earth Surface Processes and Landforms, Volume 51, Issue 1, January 2026.
Floods are one of the most critical environmental threats in Central Europe. We show the importance of geomorphological records from Ahr flood deposits for reconstructing past high‐magnitude flood events. Our chemolithostratigraphical analysis shows that centennial to millennial scale high‐energy flooding is not the exception but the rule in the Ahr ...
Christoph Zielhofer, Johannes Rabiger‐Völlmer, Henriette Westermann, Markus Lothar Fischer, Birgit Schneider, Susanne Lindauer, Azra Khosravichenar, Martin Bauch, Marco Pohle, Ulrike Werban   +9 more
wiley   +1 more source